ORCID Profile
0000-0003-2232-9942
Current Organisation
Westfälische Wilhelms-Universität Münster
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Geology | Igneous and Metamorphic Petrology | Ore Deposit Petrology | Mineralogy and Crystallography | Mineralogy And Crystallography | Structural Chemistry | Solid State Chemistry | Geochemistry | Inorganic Geochemistry | Exploration Geochemistry | Ore Deposit Petrology | Earth Sciences not elsewhere classified | Isotope Geochemistry | Functional Materials | Metals and Alloy Materials | Mineral Processing | Structural Geology | Tectonics
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Earth Sciences | Mineral Exploration not elsewhere classified | Earth sciences | Concentrating processes of other base metal ores | Exploration | Oil and Gas Extraction | Mineral Resources (excl. Energy Resources) not elsewhere classified | Mining and Extraction of Titanium Minerals, Zircon, and Rare Earth Metal Ores (e.g. Monazite) | Expanding Knowledge in Engineering | Precious (Noble) Metal Ore Exploration | Titanium Minerals, Zircon, and Rare Earth Metal Ore (e.g. Monazite) Exploration |
Related Links
Publications
Mass transfer and trace element redistribution during hydration of granulites in the Bergen Arcs, Norway
Publisher: Elsevier BV
Date: 10-2016
Si,Al ordering in leucite by high-resolution 27Al MAS NMR spectroscopy
Publisher: Springer Science and Business Media LLC
Date: 07-1989
DOI: 10.1007/BF00202216
Anion Rotation and Cation Diffusion in Low-Temperature Sodium Orthophosphate: Results from Solid-State NMR
Publisher: American Chemical Society (ACS)
Date: 20-06-2001
DOI: 10.1021/JP003635T
Electron microscope study of phase transformations in cubanite
Publisher: Springer Science and Business Media LLC
Date: 1977
DOI: 10.1007/BF00308844
Thermodynamics of mixing and ordering in pyrope — grossular solid solution
Publisher: Mineralogical Society
Date: 02-2004
Abstract: Static lattice energy calculations have been combined with cluster expansion formalism to predict pairwise ordering interactions in the pyrope–grossular solid solution. The ordering interactions, the Js, have been then used to calculate the activity-composition relations over a wide temperature range with the help of the Cluster Variation Method. It is shown that short-range ordering in the system is driven by size mismatch. The prediction of the right signs and magnitudes of the ordering interaction energies requires separation of the mixing enthalpy into the configuration-dependent (chemical) and the configuration-independent (elastic) components. The study predicts the existence of a miscibility gap below 500°C.
Temperature-Dependent Fractionation of Particulate Matter and Sulfates from a Hot Flue Gas in Pressurized Pulverized Coal Combustion (PPCC)
Publisher: American Chemical Society (ACS)
Date: 05-05-2000
DOI: 10.1021/EF9901793
Effects of nanoscale exsolution in hematite–ilmenite on the acquisition of stable natural remanent magnetization
Publisher: Elsevier BV
Date: 08-2004
Alkali retention in hot coal slag under controlled oxidizing gas atmospheres (air–CO2)
Publisher: Elsevier BV
Date: 10-2000
Phase transition behaviour and equilibrium phase relations in the fast-ion conductor system Na3PO4–Na2SO4
Publisher: Royal Society of Chemistry (RSC)
Date: 27-05-2002
DOI: 10.1039/B110947B
Nanoscale Observations of Magnesite Growth in Chloride- And Sulfate-Rich Solutions
Publisher: American Chemical Society (ACS)
Date: 22-07-2013
DOI: 10.1021/ES401188J
Abstract: Magnesite growth in chloride and sulfate-rich solutions has been examined at 90 °C in situ using phase-shift interferometry (PSI) and ex situ using atomic force microscopy (AFM) to evaluate the feasibility of cosequestering SO2 and CO2 in Mg-rich rocks. Although sulfate may assist desolvation at the magnesite surface, evidence for enhanced growth was only found at specific surface sites. The overall growth rates fit with those observed for chloride experiments in similarly saturated solutions. Thus, the formation of Mg-SO4 ion pairs in solution, which lowers the supersaturation with respect to magnesite, will have the dominant effect during sequestration. Lowering the activity of Mg(2+) ions in solution also inhibited the nucleation of other hydrated Mg-carbonate phases. As no evidence was found for sulfate incorporation into the growing magnesite, the presence of sulfate in solution will be detrimental to CO2 sequestration and is not expected to be cosequestered. The PSI data also emphasize the variability of reactivity over the surface and how this changes as a function of solution saturation and composition.
The effect of specific background electrolytes on water structure and solute hydration: Consequences for crystal dissolution and growth
Publisher: Elsevier BV
Date: 09-2008
Fluid‐Induced Processes: Metasomatism and Metamorphism
Publisher: Wiley
Date: 23-12-2010
Effect of Secondary Phase Formation on the Carbonation of Olivine
Publisher: American Chemical Society (ACS)
Date: 27-07-2010
DOI: 10.1021/ES9038193
Abstract: Large-scale olivine carbonation has been proposed as a potential method for sequestering CO(2) emissions. For in situ carbonation techniques, understanding the relationship between the formation of carbonate and other phases is important to predict the impact of possible passivating layers on the reaction. Therefore, we have conducted reactions of olivine with carbonated saline solutions in unstirred batch reactors. Altering the reaction conditions changed the Mg-carbonate morphology. We propose that this corresponded to changes in the ability of the system to precipitate hydromagnesite or magnesite. During high-temperature reactions (200 degrees C), an amorphous silica-enriched phase was precipitated that was transformed to lizardite as the reaction progressed. Hematite was also precipitated in the initial stages of these reactions but dissolved as the reaction proceeded. Comparison of the experimental observations with reaction models indicates that the reactions are governed by the interfacial fluid composition. The presence of a new Mg-silicate phase and the formation of secondary products at the olivine surface are likely to limit the extent of olivine to carbonate conversion.
Kinetics of crystal nucleation in ionic solutions: Electrostatics and hydration forces
Publisher: Elsevier BV
Date: 2010
Sharpened interface
Publisher: Springer Science and Business Media LLC
Date: 20-02-2015
DOI: 10.1038/NMAT4198
Ionic conductivity and pressure dependence of trigonal-to-cubic phase transition in lithium sodium sulphate
Publisher: Elsevier BV
Date: 02-07-2001
Oxygen isotope analysis of olivine by ion microprobe: Matrix effects and applications to a serpentinised dunite
Publisher: Elsevier BV
Date: 11-2018
Fluid-rock reaction mechanisms and the inevitable consequences for mass transport and texture formation.
Publisher: Copernicus GmbH
Date: 27-03-2022
DOI: 10.5194/EGUSPHERE-EGU22-2307
Abstract: & & It is well-established that the mechanism of re-equilibration of a mineral assemblage at temperatures where the spatial scale of solid-state diffusion is restricted to intra-crystalline processes, is by dissolution-transport-precipitation. When the dissolution and precipitation steps are spatially coupled, pseudomorphic mineral replacement, in the absence of deformation, is a common observation in both nature and experiment. External stress appears to uncouple the dissolution and precipitation steps, inevitably leading to mass transport and dissolution-precipitation creep as the dominant deformation mechanism. The precipitation process involves nucleation and, in deforming rocks, the minimisation of surface energy leads towards textural equilibration and metamorphic differentiation. The overall process can be considered as a sequence of recrystallisation steps that lead to minimisation of chemical and textural components of the overall free energy. Ex les will be given from metamorphic reactions, diagenesis and sub-solidus texture formation in igneous rocks.& &
Peridotite weathering is the missing ingredient of Earth’s continental crust composition
Publisher: Springer Science and Business Media LLC
Date: 12-02-2018
DOI: 10.1038/S41467-018-03039-9
Abstract: The chemical composition of the continental crust cannot be adequately explained by current models for its formation, because it is too rich in Ni and Cr compared to that which can be generated by any of the proposed mechanisms. Estimates of the crust composition are derived from average sediment, while crustal growth is ascribed to amalgamation of differentiated magmatic rocks at continental margins. Here we show that chemical weathering of Ni- and Cr-rich, undifferentiated ultramafic rock equivalent to ~1.3 wt% of today’s continental crust compensates for low Ni and Cr in formation models of the continental crust. Ultramafic rock weathering produces a residual that is enriched in Ni and also silica. In the light of potentially large volumes of ultramafic rock and high atmospheric CO 2 concentrations during the Archean, chemical weathering must therefore have played a major role in forming compositionally evolved components of the early Earth’s crust.
The role of reacting solution and temperature on compositional evolution during harzburgite alteration: Constraints from the Mesoarchean Nuasahi Massif (eastern India)
Publisher: Elsevier BV
Date: 07-2016
Electron petrography of shock-produced veins in the Tenham chondrite
Publisher: Springer Science and Business Media LLC
Date: 12-1979
DOI: 10.1007/BF00375437
The trigonal-to-cubic phase transition in LiNaSO4: An X-ray and calorimetric study
Publisher: Walter de Gruyter GmbH
Date: 11-1998
DOI: 10.1524/ZKRI.1998.213.11.575
Abstract: At increasing temperature sulfate groups in LiNaSO 4 undergo rotational disorder which lead to an enhanced mobility of the cationic species. This disorder results in a phase transition above which the material is a superionic conductor. In order to understand the nature of the phase transition we have carried out extensive X-ray and calorimetric studies of LiNaSO 4 . This includes the first reported single crystal X-ray investigation on the high temperature phase. The α – β phase transition in LiNaSO 4 is strongly first order ( T tr = 788 K) with a volume change of 6%. However, the α and β -form bear a close structural relationship. Precursor effects indicate the approaching phase transition. We found a strongly anisotropic thermal expansion in the low temperature phase. The λ -like increase of specific heat suggests the onset of the SO 4 -rotation well below T tr . Short range order in the high temperature phase which considerably affects the heat capacity and the volume as well as indications for a further phase transition are discussed within the scope of Landau-theory. Finally, we introduce a transition-model combining the features of a continuous part and a discontinuous part of the phase transition.
Mineral replacement reactions: from macroscopic observations to microscopic mechanisms
Publisher: Mineralogical Society
Date: 10-2002
Abstract: Mineral replacement reactions take place primarily by dissolution-reprecipitation processes. Processes such as cation exchange, chemical weathering, deuteric alteration, leaching, pseudomorphism, metasomatism, diagenesis and metamorphism are all linked by common features in which one mineral or mineral assemblage is replaced by a more stable assemblage. The aim of this paper is to review some of these aspects of mineral replacement and to demonstrate the textural features they have in common, in order to emphasize the similarities in the underlying microscopic mechanisms. The role of volume change and evolution of porosity is explored both from natural microtextures and new experiments on model replacement reactions in simple salts. It is shown that the development of porosity is often a consequence of mineral replacement processes, irrespective of the relative molar volumes of parent and product solid phases. The key issue is the relative solubility of the phases in the fluid phase. Concepts such as coupled dissolution-precipitation, and autocatalysis are important in understanding these processes. Some consequences of porosity generation for metamorphic fluid flow as well as subsequent crystal growth are also discussed.
A two-dimensional spin model of Al/Si order in feldspars: visualization of short-range and long-range order
Publisher: Schweizerbart
Date: 30-03-2001
Blaubleibender covellite and its relationship to normal covellite
Publisher: Springer Science and Business Media LLC
Date: 1977
DOI: 10.1007/BF00372282
DISSOLUTION OF URANYL-OXIDE-HYDROXY-HYDRATE MINERALS. I. CURITE
Publisher: Mineralogical Association of Canada
Date: 04-2006
Experimental observation of an interface-controlled pseudomorphic replacement reaction in a natural crystalline pyrochlore
Publisher: Mineralogical Society of America
Date: 10-2005
DOI: 10.2138/AM.2005.1970
Elucidation of the mechanism and kinetics of the silicon, aluminum ordering process in synthetic magnesium cordierite by silicon-29 magic angle spinning NMR spectroscopy
Publisher: American Chemical Society (ACS)
Date: 06-1986
DOI: 10.1021/JA00272A010
A triclinic phase of relaxor La-modified Pb(Zr0.65Ti0.35)O3 and its structure at 40 K by high-resolution neutron diffraction
Publisher: AIP Publishing
Date: 15-12-2001
DOI: 10.1063/1.1409580
Abstract: The phase transitions and structure of 7% La-modified Pb(Zr0.65Ti0.35)O3 (PLZT 7/65/35) at 40 K were investigated using high-resolution powder diffraction. The high-resolution data suggest the existence of an alternate phase, which is not expected from the widely accepted phase diagram. By structural analysis and Rietveld refinement, the space group of this phase was determined to be F1 (the standard setting is P1 by adding face-centered generators), rather than the expected R3c or the reported Cm phase. The unit cell of this phase is deduced by doubling the primitive cubic cell along three main axes, cell parameters area a=8.14546(13) Å, b=8.18539(15) Å, c=8.16785(11) Å, and interaxial angles are α=90.1925(24)°, β=89.8785(26)°, and γ=90.1564(34)°. The tilting system of oxygen octahedra is āb̄c̄ instead of āāā in the R3c phase. The cation displacements and polarization are described in detail. The polarization direction was found to be along 〈112〉, not the main axes. The phase relationship and domain morphology are discussed in light of this triclinic phase, suggesting that this phase is important to understand the complex phase transitions and domain morphology in this series of materials. The experimental results suggest that this triclinic phase may extend to other compositions and temperature range.
Why Mineral Interfaces Matter
Publisher: American Association for the Advancement of Science (AAAS)
Date: 28-03-2014
Abstract: Reactions at mineral-fluid interfaces play a key role in processes ranging from the deep Earth to materials synthesis and nuclear waste storage.
The Complex Hydrothermal History of Granitic Rocks: Multiple Feldspar Replacement Reactions under Subsolidus Conditions
Publisher: Oxford University Press (OUP)
Date: 05-2009
The transformation behaviour of bornite
Publisher: Springer Science and Business Media LLC
Date: 1976
DOI: 10.1007/BF00371341
Al, Si ordering in cordierite using ?magic angle spinning? NMR
Publisher: Springer Science and Business Media LLC
Date: 09-1985
DOI: 10.1007/BF00311291
Al,Si ordering on cordierite using ?magic angle spinning? NMR
Publisher: Springer Science and Business Media LLC
Date: 09-1985
DOI: 10.1007/BF00311290
Experimentally produced oscillatory zoning in the (Ba, Sr)SO4 solid solution
Publisher: Springer Science and Business Media LLC
Date: 08-1992
DOI: 10.1038/358743A0
Off‐axis electron holography of magnetic nanowires and chains, rings, and planar arrays of magnetic nanoparticles
Publisher: Wiley
Date: 08-2004
DOI: 10.1002/JEMT.20098
Abstract: A selection of recent results illustrating the application of off‐axis electron holography to the study of magnetic microstructure in closely‐spaced nanoparticles and nanowires is reviewed. Ex les are taken from the characterization of FeNi nanoparticle chains, Co nanoparticle rings, two‐dimensional arrays of naturally occurring magnetite crystals in minerals, and single crystalline Co nanowires. Approaches that can be used to separate the magnetic signal of interest from the mean inner potential contribution to the measured holographic phase shift are described, and the spatial and phase resolution that can be achieved are discussed. Microsc. Res. Tech. 64:390–402, 2004. © 2004 Wiley‐Liss, Inc.
Crystal growth and dissolution processes at the calcite–water interface in the presence of zinc ions
Publisher: Elsevier BV
Date: 2005
Tweed microstructures: Experimental observations and some theoretical models
Publisher: Informa UK Limited
Date: 03-1994
A mechanism for pyroxene-pyroxenoid and pyroxenoid-pyroxenoid transformations
Publisher: Springer Science and Business Media LLC
Date: 04-1984
DOI: 10.1007/BF00309316
Supersaturation functions in binary solid solution–aqueous solution systems
Publisher: Elsevier BV
Date: 05-2003
Disequilibrium metamorphism of stressed lithosphere
Publisher: Elsevier BV
Date: 03-2016
From granulite hydration to metamorphic differentiation: Evolution of a shear zone.
Publisher: Copernicus GmbH
Date: 23-03-2020
DOI: 10.5194/EGUSPHERE-EGU2020-12862
Abstract: & & & span& The studied outcrop, located within the Bergen arcs of southwestern Norway, preserves the hydration of an anorthositic granulite at hibolite-facies conditions. The hibolite-facies hydration is expressed as both a statically hydrated hibolite and a shear zone rock, defined by the interlayering of hibolite with leucocratic domains. Within the outcrop, quartz-filled fractures and their associated hibolite alteration haloes crosscut the granulite. These fractures are relicts of the initial fluid infiltration event. The fracture assemblage (quartz + plagioclase + zoisite + kyanite & #177 muscovite & #177 biotite) is equivalent to that occurring locally within leucocratic domains of the shear zone. Due to the textural and compositional similarities between quartz-filled fractures and leucocratic domains, the compositional layering of the shear zone rock may be directly linked to fracturing during initial fluid infiltration. Mass-balance calculations indicate quartz-filled fractures and compositional differentiation of the shear zone form by internal fractionation rather than partial melting or precipitation of minerals from an eternally derived fluid. This inferred fluid connectivity combined with the enhanced local dissolution indicates the presence of a continuously replenished fluid along fracture pathways. The overall conclusion is that the mass transfer processes that result in metamorphic differentiation of the shear zone lithologies are dependent on both continuous fluid flux and heterogeneous strain distribution. & /span& & &
Static lattice energy calculations of mixing and ordering enthalpy in binary carbonate solid solutions
Publisher: Elsevier BV
Date: 2006
Replacement and ion exchange reactions of scolecite in a high pH aqueous solution
Publisher: Schweizerbart
Date: 31-03-2014
Nanoscale phenomena during the growth of solid solutions on calcite {101¯4} surfaces
Publisher: Elsevier BV
Date: 2006
Effects of kinetics and mechanisms of crystal growth on ion-partitioning in solid solution–aqueous solution (SS–AS) systems
Publisher: Mineralogical Society of Great Britain & Ireland
Date: 2010
Thermal decomposition and cation mobility in bornite
Publisher: Society of Economic Geologists
Date: 10-1976
Enthalpy effects associated with Al/Si ordering in anhydrous Mg-cordierite
Publisher: Elsevier BV
Date: 05-1983
Strain-Induced Segmentation of Magnesian Calcite Thin Films Growing on a Calcite Substrate
Publisher: American Chemical Society (ACS)
Date: 27-08-2010
DOI: 10.1021/CG100202H
Nano-cluster composite structure of calcitic sponge spicules—A case study of basic characteristics of biominerals
Publisher: Elsevier BV
Date: 2006
DOI: 10.1016/J.JINORGBIO.2005.10.005
Abstract: Spicules of calcareous sponges are elaborately shaped skeletal elements that nonetheless show characteristics of calcite single-crystals. Our atomic force microscopic and transmission electron microscopic investigation of the triradiate spicules of the sponge Pericharax heteroraphis reveals a nano-cluster structure with mostly well-aligned small crystal domains and pockets with accumulated domain misalignments. Combined high-resolution and energy-filtering transmission electron microscopy revealed carbon enrichments located in between crystal domain boundaries, which strongly suggests an intercalated network-like proteinaceous organic matrix. This matrix is proposed to be involved in the nano-clustered calcite precipitation via a transient phase that may enable a 'brick-by-brick' formation of composite and yet single-crystalline spicules with elaborate morphologies. This composite cluster structure reduces the brittleness of the material by dissipating strain energy and deflecting crack propagation from the calcite cleavage planes, but the lattice symmetry and anisotropic growth properties of calcite still play a major role in the morphogenesis of these unusual calcite single-crystals. Our structural, crystallographic, textural, and chemical analysis of sponge spicules corroborates the view that nano-clustered crystal growth, induced by organic matrices, is a basic characteristic of biomineralisation that enables the production of composite materials with elaborate morphologies.
High-pressure (Mg, Fe)2SiO4 phases in the Tenham chondritic meteorite
Publisher: Springer Science and Business Media LLC
Date: 07-1979
DOI: 10.1038/280217A0
Boron isotopes in tourmaline as a tracer of metasomatic processes in the Bamble sector of Southern Norway
Publisher: Springer Science and Business Media LLC
Date: 10-2014
Microstructurally controlled trace element (Zr, U–Pb) concentrations in metamorphic rutile: An example from the amphibolites of the Bergen Arcs
Publisher: Wiley
Date: 25-11-2019
DOI: 10.1111/JMG.12514
Monazite as a monitor for melt-rock interaction during cooling and exhumation
Publisher: Wiley
Date: 15-02-2019
DOI: 10.1111/JMG.12471
Replacement reactions of copper sulphides at moderate temperature in acidic solutions
Publisher: Elsevier BV
Date: 08-2020
Molecular-scale mechanisms of crystal growth in barite
Publisher: Springer Science and Business Media LLC
Date: 10-1998
DOI: 10.1038/26718
Kinetics and mineralogical analysis of copper dissolution from a bornite/chalcopyrite composite sample in ferric-chloride and methanesulfonic-acid solutions
Publisher: Elsevier BV
Date: 09-2019
Complex replacement patterns in garnets from Bergen Arcs eclogites: A combined EBSD and analytical TEM study
Publisher: Elsevier BV
Date: 06-2008
The kinetics of dehydration and order-disorder of molecular H20 in Mg-cordierite
Publisher: Schweizerbart
Date: 03-05-1989
DOI: 10.1127/EJM/1/2/0193
Characterization of local atomic environment and quantitative determination of changes in site occupancies during the formation of ordered synthetic cordierite by 29Si and 27Al magic-angle spinning n.
Publisher: Royal Society of Chemistry (RSC)
Date: 1983
DOI: 10.1039/C39830000556
The mechanism of the hydrothermal alteration of cerium- and plutonium-doped zirconolite
Publisher: Elsevier BV
Date: 03-2011
Symplectite formation in the presence of a reactive fluid: insights from hydrothermal experiments
Publisher: Wiley
Date: 07-12-2016
DOI: 10.1111/JMG.12231
Interaction of Calcium Carbonates with Lead in Aqueous Solutions
Publisher: American Chemical Society (ACS)
Date: 24-06-2003
DOI: 10.1021/ES020238I
Abstract: Pure calcium carbonate (calcite and aragonite) solid materials of different particle size (100-200 microm fragments and millimeter-sized single crystals) were interacted with Pb in aqueous solutions at room temperature under atmospheric PCO2. In the case of the micrometer-sized s les, the macroscopic investigation using a batch-type treatment procedure (solutions between 10 and 1000 mg/L Pb) and ICP-AES, SEM-EDS, and powder-XRD showed that the metal is readily removed from the aqueous media by both materials and indicated the sorption processes (mainly surface precipitation leading to overgrowth of cerussite and hydrocerussite crystals) taking place in parallel with surface dissolution processes. The various processes occurring at the calcium carbonate solid-water interface were clearly distinguished and defined in the case of the millimeter-sized s les interacted with 1000 mg/L Pb using a combination of wet-chemical, in-situ (AFM) and ex-situ (AFM, SEM) microscopic, and surface spectroscopic (XPS, 12C-RBS) techniques. The in-situ AFM data revealed the dissolution processes on the surface of the calcium carbonates and the simultaneous heterogeneous nucleation of lead carbonate phases and confirmed the secondary dissolution of lead carbonate crystals grown epitaxially from the initial nuclei. The XPS spectra confirmed that adsorption of Pb occurs simultaneously to dissolution at short interaction times (less than approximately 10 min, prior to precipitation-nucleation/crystal growth) in the case of both CaCO3 polymorphs and that the calcite surface with adsorbed Pb may have an aragonite-type character. The 12C-RBS spectra indicated that absorption (incorporation of Pb2+ ions) also takes place in parallel at the surface layers of the calcium carbonates, resulting in formation of solid solutions.
Observation of nano-clustered calcite growth via a transient phase mediated by organic polyanions: A close match for biomineralization
Publisher: Mineralogical Society of America
Date: 07-2005
DOI: 10.2138/AM.2005.1833
Microscopic and spectroscopic investigation of the calcite surface interacted with Hg(II) in aqueous solutions
Publisher: Mineralogical Society
Date: 12-2003
Abstract: The interaction of the {10 4} cleavage surface of calcite with Hg(CH 3 COO) 2 aqueous solutions with concentration of 5 mM Hg(II) (pH ≈3.5), was investigated using microscopic and spectroscopic techniques. In situ atomic force microscopy experiments showed that surface microtopography changes significantly as a result of the interaction, and that the initial rhombic etch pits induced by H 2 O dissolution are rapidly transformed to deeper etch pits exhibiting an unusual triangular shape. The growth of these etch pits is strongly anisotropic, moving faster along the [2 1] direction than along the [010] direction (with step-retreat velocities of ∼12 nm s –1 and ∼4 nm s –1 , respectively). The modified etch pits are due to Hg(II) sorption in the surface, rather than due to the effect of the acetate anion. The sorption (adsorption and probably absorption also) of Hg(II), in the first minutes of the interaction, is shown by X-ray photoelectron spectroscopy. After ∼2 h, the triangular etch pits are interconnected to form larger hexagonal etch pits, while Hg(II)-bearing phases (confirmed later by SEM-EDS) grow onto the surface through a heterogeneous nucleation process. The crystal growth of orthorhombic (montroydite-type) hydrated Hg(II) oxide (HgO· n H 2 O) on the surface of calcite was confirmed by XRD patterns and FT-IR spectra from s les exposed for longer times to Hg(CH 3 COO) 2 solution.
Crystallisation of sodium sulfate: supersaturation and metastable phases
Publisher: Springer Science and Business Media LLC
Date: 09-11-1970
ALBITIZATION OF GRANITIC ROCKS: THE MECHANISM OF REPLACEMENT OF OLIGOCLASE BY ALBITE
Publisher: Mineralogical Association of Canada
Date: 12-1970
Oxidation phenomena in pleonaste bearing titanomagnetites
Publisher: Springer Science and Business Media LLC
Date: 1979
DOI: 10.1007/BF00372261
The role of magnesium in the growth of calcite: An AFM study
Publisher: Elsevier BV
Date: 03-2010
Determination of the mechanism of cation ordering in magnesioferrite (MgFe 2 O 4 ) from the time- and temperature-dependence of magnetic susceptibility
Publisher: Springer Science and Business Media LLC
Date: 15-04-1999
Polycrystalline apatite synthesized by hydrothermal replacement of calcium carbonates
Publisher: Elsevier BV
Date: 06-2011
New developments in mineral surface sciences
Publisher: Japan Association of Mineralogical Sciences
Date: 2003
DOI: 10.2465/JMPS.98.9
Electron microscope and diffraction study of phase separation in iron sulphide
Publisher: Informa UK Limited
Date: 03-1975
Thermodynamics of pyrope–majorite, Mg3Al2Si3O12–Mg4Si4O12, solid solution from atomistic model calculations
Publisher: Informa UK Limited
Date: 02-2006
Sector trilling in cordierite and equilibrium overstepping in metamorphism
Publisher: Springer Science and Business Media LLC
Date: 06-1986
DOI: 10.1007/BF00371328
Deformation and fluid-infiltration influence in the evolution of the Krossøy dyke-swarm in the northern part of the Bergen Arcs, Norway
Publisher: Copernicus GmbH
Date: 15-05-2023
DOI: 10.5194/EGUSPHERE-EGU23-5460
Abstract: The Bergen Arcs, in Norway, consist of several arcuate nappes formed during the Caledonian orogeny 440-420 Ma ago (Bingen et al., 2001 Glodny et al., 2008) when the western margin of Baltica was subducted below Laurentia. This Caledonian orogeny overprinted many of the anorthosites that formed the 930 Ma old (Bingen et al., 2001) granulitic basement. This overprint resulted in both hibolites and eclogites and have been observed in shear zones within the rocks of the well-studied island of Holsn& #248 y, located on the western margin of the Lind& #229 s Nappe. On the adjacent island of Rad& #248 y, the Caledonian overprint is associated with hibolite facies shear zones (Mukai et al., 2014 Moore et al., 2020).In the northern margin of the Bergen Arcs, near the Bergen Arcs Shear Zone, the much less-studied island of Kross& #248 y also exposes the anorthosites from the old granulitic basement and here the Caledonian overprint also resulted only in hibolite facies metamorphism. The anorthosites in Kross& #248 y are intruded by a series of subparallel mafic granulitic dykes forming the Kross& #248 y dyke swarm, that has never previously been described elsewhere in the Bergen Arcs. The style of deformation in the granulites and the textural evolution in the hibolite facies overprint are also markedly different from the rocks on Holsn& #248 y and Rad& #248 y. The development of ductile Caledonian shear zones may have been facilitated by initial brittle failure of the basement accompanied by fluid infiltration (Jamtveit et al., 2018). Here we investigate the influence of this deformation and fluid infiltration on different features observed on these rocks such as: the occurrence of plagioclase coronas around the garnets on the dykes the presence of different types of symplectites the variability of size, deformation and composition observed on the anorthositic feldspars or the local changes of fluid composition along cm- long fractures. We will show our first analytical results on some of these key features and discuss their relevance in the context of the previous studies of the Bergen Arcs.& Bingen, B., David, W. J., & Austrheim, H. (2001). Zircon U-Pb geochronology in the Bergen Arc eclogites and their Protereyoic protoliths, and implications for the pre-Scandian evolution of the Caledonides in western Norway. In GSA Bulletin (Issue 5). 0.1130/0016-7606(2001)113 :ZUPGIT .0.CO Glodny, J., Ku& #776 hn, A., & Austrheim, H. (2008). Geochronology of fluid-induced eclogite and hibolite facies metamorphic reactions in a subduction-collision system, Bergen Arcs, Norway. Contributions to Mineralogy and Petrology, 156(1), 27& #8211 . 0.1007/s00410-007-0272-yJamtveit, B., Moulas, E., Andersen, T. B., Austrheim, H., Corfu, F., Petley-Ragan, A., & Schmalholz, S. M. (2018). High Pressure Metamorphism Caused by Fluid Induced Weakening of Deep Continental Crust. Scientific Reports, 8(1). 0.1038/s41598-018-35200-1Moore J., Beinlich A., Piazolo S., Austrheim H. & Putnis A.& (2020). Metamorphic differentiation via enhanced dissolution along high permeability zones. Journal of Petrology 61, 10. 0.1093 etrology/egaa096Mukai H., Austrheim H., Putnis CV. & Putnis A. (2014). Textural evolution of plagioclase feldspar across a shear zone: implications for deformation mechanism and rock strength. Journal of Petrology. 55, 1457-1477. 0.1093 etrology/egu03
An investigation of the phase transitions in bornite (Cu5FeS4) using neutron diffraction and differential scanning calorimetry
Publisher: Mineralogical Society of America
Date: 12-1998
Replacement Processes in the Earth's Crust
Publisher: Mineralogical Society of America
Date: 06-2010
Nucleation, growth, and zoning phenomena in crystallizing (Ba,Sr)CO3, Ba(SO4,CrO4), (Ba,Sr)SO4, and (Cd,Ca)CO3 solid solutions from aqueous solutions
Publisher: Elsevier BV
Date: 08-1997
Crystallization of solid solutions from aqueous solutions in a porous medium: zoning in (Ba, Sr)SO4
Publisher: Cambridge University Press (CUP)
Date: 05-1993
DOI: 10.1017/S0016756800019981
Abstract: Barite-celestite solid solutions have been synthesized under controlled conditions by the counter-diffusion of Ba 2+ , Sr 2+ and SO 4 2– ions through a porous transport medium (silica gel), to investigate the factors which control compositionalzoning. The equilibrium compositions of solid solution and aqueous solutionhave been determined from the relative solubilities of barite and celestite, predicting that virtually pure barite should precipitate from Sr-rich solutions. However, nucleation and growth in a porous medium, where mass transport is by diffusion, takes place at very high supersaturations. The threshold supersaturation for nucleation is inversely related to the solubility and is therefore much higher for barite than celestite. The balance between the thermodynamics and kinetics of nucleation and growth at high supersaturations leads to zoning patterns the reverse of those predicted at equilibrium. At high supersaturations the zoning is periodic and sector-controlled with many of the general features observed in natural minerals. Oscillatory zoning with compositional gaps can take place without the need to invoke miscibility gaps or periodic variations in externally controlled intensive parameters.
Textural and chemical evolution of pyroxene during hydration and deformation: A consequence of retrograde metamorphism
Publisher: Elsevier BV
Date: 2018
Observations on coexisting pyrrhotite phases by transmission electron microscopy
Publisher: Springer Science and Business Media LLC
Date: 1975
DOI: 10.1007/BF00401459
An AFM study on ferroelastic domains in lead phosphate,
Publisher: IOP Publishing
Date: 06-10-1997
Structural states of Mg cordierite III: Infrared spectroscopy and the nature of the hexagonal-modulated transition
Publisher: Springer Science and Business Media LLC
Date: 02-1989
DOI: 10.1007/BF00199557
Low-temperature aqueous alteration of crystalline pyrochlore: correspondence between nature and experiment
Publisher: Mineralogical Society
Date: 12-2004
Abstract: Pyrochlore has been considered as a waste form to immobilize high-level nuclear waste such as excess weapons-grade plutonium. In order to study the aqueous stability of pyrochlore, we have carried out hydrothermal experiments with a natural microlite (Nb + Ta 2Ti Ta ⩾ Nb) at 175°C in a neutral and acidic solution for 14 days. The starting material and the experimental products were studied by electron microprobe, backscattered electron (BSE) imaging, powder infrared (IR) and micro-Raman spectroscopy, and powder X-ray diffractrometry (XRD). The microlite has small U (∼200 ppm) and Th (∼800 ppm) contents and is crystalline. The hydrothermal treatment in a solution containing l mol/l HCl and l mol/l CaCl 2 causes the partial replacement of the microlite (up to ∼10 μm) by a new pyrochlore phase. This new phase is characterized by a larger unit-cell volume and contains a large number of vacancies at the A site ( A = Ca, Na) as well as anion vacancies, molecular water, and possibly OH groups. Analyses of the experimental fluid further revealed that U was also selectively lost to the solution. Treatment in pure water did not produce reaction zones detectable by BSE imaging or powder XRD. However, significant spectral changes in powder IR spectra of the reaction product and the detection of Na and Ca in the solution indicate that the microlite has also reacted in pure water. The experimental alteration features bear a remarkable resemblance to those seen in naturally altered microlite s les, suggesting that short-term experimental results can be applied to natural systems and vice versa in order to evaluate the long-term stability of a pyrochlore waste form.
The mechanism of exsolution of hematite from iron-bearing rutile
Publisher: Springer Science and Business Media LLC
Date: 1978
DOI: 10.1007/BF00308121
A mechanism of ion exchange by interface-coupled dissolution-precipitation in the presence of an aqueous fluid
Publisher: Elsevier BV
Date: 12-2012
Anisotropic etching of silicon in hydrazine
Publisher: Elsevier BV
Date: 09-2009
Concentric zoning patterns in crystallizing (Cd,Ca)CO3 solid solutions from aqueous solutions
Publisher: Mineralogical Society
Date: 06-1999
Abstract: Otavite-calcite solid solutions have been synthesized to investigate the factors which control the patterns of compositional zoning. The equilibrium partitioning of otavite between the aqueous and the solid phase can be described by means of a function X CdCO 3 ( X Cd,aq ) eq , which relates the solid mole fraction and the aqueous activity fraction of Cd. According to this function, there is a strong preferential partitioning of Cd towards the solid. A set of experiments starting with parent solutions with different Cd 2+ /Ca 2+ ratios was carried out. In these experiments nucleation takes place at high supersaturations and the Cd 2+ and Ca 2+ ions tend to be laid down in a ratio which deviates from the equilibrium distribution. Experimental nucleation data can be fitted to a curve X CdCO 3 ( X Cd,aq ) ef of the same functionality as that for equilibrium. After nucleation, supersaturation decreases as the crystals grow. During this process, substituting ions are not incorporated into the solid in the same stoichiometric proportion as in the aqueous solution. Therefore, crystal and fluid compositions tend to vary as growth proceeds and this evolution is registered as a compositional zoning. The curves X CdCO 3 ( X Cd,aq ) eq and X CdCO 3 ( X Cd,aq ) ef confine the reaction path corresponding to the growth process. Here, these curves are used to account for the observed zoning patterns.
A kinetic study of the exsolution of pentlandite (Ni, Fe)9S8from the monosulfide solid solution (Fe, Ni)S
Publisher: Mineralogical Society of America
Date: 2004
DOI: 10.2138/AM-2004-0106
Direct imaging of nanoscale magnetic interactions in minerals
Publisher: Proceedings of the National Academy of Sciences
Date: 13-12-2002
Abstract: The magnetic microstructure of a natural, finely exsolved intergrowth of submicron magnetite blocks in an ulvöspinel matrix is characterized by using off-axis electron holography in the transmission electron microscope. Single-domain and vortex states in in idual blocks, as well as magnetostatic interaction fields between them, are imaged at a spatial resolution approaching the nanometer scale. The images reveal an extremely complicated magnetic structure dominated by the shapes of the blocks and magnetostatic interactions. Magnetic superstates, in which clusters of magnetite blocks act collectively to form vortex and multidomain states that have zero net magnetization, are observed directly.
Kinetic study of chalcopyrite dissolution with iron(III) chloride in methanesulfonic acid
Publisher: Elsevier BV
Date: 08-2018
Nanoscale observations of the effect of cobalt on calcite growth and dissolution
Publisher: Elsevier BV
Date: 06-2004
Nanoscale observations of the epitaxial growth of hashemite on barite (001)
Publisher: Elsevier BV
Date: 10-2005
Metastable phenomena on calcite {101̄4} surfaces growing from Sr2+–Ca2+–CO32− aqueous solutions
Publisher: Elsevier BV
Date: 2003
A mechanism of ion exchange by interface-coupled dissolution-precipitation in the presence of an aqueous fluid
Publisher: Copernicus GmbH
Date: 15-05-2023
DOI: 10.5194/EGUSPHERE-EGU23-3792
Abstract: The equilibration of minerals in the presence of an aqueous fluid phase, with which it is out of equilibrium, has been described in terms of a number of potential mechanisms, specifically mainly either by solid state exchange of elements within the solid phase and the aqueous solution, or by interface-coupled dissolution-precipitation where equilibration is approached by the incremental dissolution of the parent solid and the coupled precipitation of a new product solid (Ruiz-Agudo et al., 2014). The conditions determining the equilibration mechanism can be defined by the specific chemical potential differences at the mineral interface, the kinetics of potential reactions, the solubility of the solid phase in the specific fluid and physical properties such as the mineral: fluid ratio as well as the surface area: fluid ratio, temperature and pressure. We focus on the mechanism of ion exchange in a range of minerals and in most cases ion-exchange in the presence of an aqueous solution occurs by interface-coupled dissolution-precipitation (Putnis and Putnis, 2022).ReferencesPutnis C.V. and Putnis A. 2022. A mechanism of ion exchange by interface-coupled dissolution-precipitation in the presence of an aqueous fluid. J. Crystal Growth, 600, 126840Ruiz-Agudo E., Putnis C.V., Putnis A. 2014. Coupled dissolution and precipitation at mineral-fluid interfaces. Chemical Geology 383, 132-146.
Dissolution of barite by a chelating ligand: An atomic force microscopy study
Publisher: Elsevier BV
Date: 11-1995
The transformation behaviour of metal-enriched chalcopyrite
Publisher: Springer Science and Business Media LLC
Date: 1976
DOI: 10.1007/BF00382181
The kinetics of barite dissolution and precipitation in water and sodium chloride brines at 44–85°C
Publisher: Elsevier BV
Date: 05-1993
Planar and line defects in the sapphirine polytypes
Publisher: Springer Science and Business Media LLC
Date: 08-1988
DOI: 10.1007/BF00311025
A TEM study of samples from acid mine drainage systems: metal-mineral association with implications for transport
Publisher: Elsevier BV
Date: 10-1999
What controls the preservation of hydration interfaces in high grade metamorphic rocks?
Publisher: Copernicus GmbH
Date: 15-05-2023
DOI: 10.5194/EGUSPHERE-EGU23-17238
Abstract: The hydration of initially dry, lower crustal metamorphic rocks during orogenesis is a commonly observed phenomenon and hydration/reaction interfaces are also often preserved, providing a unique insight into the evolution of the lithosphere. Often the interfaces between unreacted and reacted rock are very sharp, even on a thin section scale, and various explanations have been proposed to account for the abrupt changes in mineral assemblage on such a small spatial scale. Common to a wide range of specific ex les is the role of an infiltrating aqueous fluid that is generally assumed to be required for the reaction to take place, although other features of such reaction fronts can differ widely in terms of density changes and the apparent difference in metamorphic grade across a sharp interface.& The ex les discussed here all involve the hydration of basement granulite rocks formed during the Caledonian Orogeny and now exposed in the Bergen Arcs in Norway. All stages of hydration can be observed from totally unreacted dry granulites with a wide range of composition to either eclogite facies or hibolite facies overprints. In these cases the density changes across the interface can either be positive (in the case of eclogite formation from anorthosite granulites), can be negative (in the hibolitisation of basic rocks) or virtually zero (during the hibolitisation of garnet bearing anorthosites). The preservation of volume across such interfaces has led to investigations of the coupling between the consequent stress generation and mass transfer, which in turn focusses on the evolution of porosity ermeability in the parent dry rock. The extent of hydration in the Bergen Arcs as a whole ( 90% hydration of ~105 km3 of granulite) suggests a plentiful supply of aqueous solution introduced seismically by fracturing and the consequent generation of shear zones from which hydration fronts spread. The hydration to either eclogite or hibolite, often observed at the same structural level (i.e. depth in the crust) continues to be an enigma.Although the details of the reactions and density changes are different, a common feature is the need for an infiltrating aqueous solution and hence the question of what drives the fluid and the hydration reaction and finally why the reaction stops at the sharp interfaces observed in the field. Terminated reactions can be studied by the extent of alteration around fracture planes by modelling the likely fluid pressure gradients that drive Darcy flow from the fluid source towards the reaction interface. Fracture planes represent zones of localised high permeability that facilitate the infiltration of fluid. The difference in fluid saturation between the fracture plane and the alteration halo is thought to be responsible for both the degree of reaction and the difference in assemblage. Additionally, the width of the initial fracture plane is thought to be proportional to the extent of the alteration halo. Ex les will be given of hydration fronts associated with hibolite facies shear zones as well as the observation of eclogite fingers within a partly hydrated granulite host. Combined reaction-fluid flow models attempt to explain these phenomena.
Structural discontinuities in plagioclase and constraints on mixing properties of the low series: a computational study
Publisher: Mineralogical Society
Date: 02-2001
Abstract: Subsolidus phase relations in the plagioclase system are investigated using an Ising-type model. The model treats ordering of Al,Si and Na,Ca cations in three dimensions using a version of the cluster variation method. The interactions within the T (Al,Si) and M (Na,Ca) sublattices and the interactions between the T and M sublattices are constrained by the available experimental information on orderdisorder transitions in the system. The paper suggests a thermodynamic explanation for the existence of two distinct structural series (high and low) and gives constraints on the thermodynamics of low plagioclases.
Metamorphic Processes and Seismicity: the Bergen Arcs as a Natural Laboratory
Publisher: Oxford University Press (OUP)
Date: 10-2017
Effect of multistage solution–mineral contact in in-situ recovery for low-grade natural copper samples: Extraction, acid consumption, gangue-mineral changes and precipitation
Publisher: Elsevier BV
Date: 12-2020
Distribution of halogens between fluid and apatite during fluid-mediated replacement processes
Publisher: Elsevier BV
Date: 12-2015
Computer simulations of water interactions with low-coordinated forsterite surface sites: Implications for the origin of water in the inner solar system
Publisher: Elsevier BV
Date: 11-2010
Order-modulated structures and the thermodynamics of cordierite reactions
Publisher: Springer Science and Business Media LLC
Date: 09-1980
DOI: 10.1038/287128A0
Transient Porosity Resulting from Fluid–Mineral Interaction and its Consequences
Publisher: Mineralogical Society of America
Date: 2015
Influence of temperature and Cl on the hydrothermal replacement of calcite by apatite and the development of porous microstructures
Publisher: Mineralogical Society of America
Date: 08-2013
DOI: 10.2138/AM.2013.4288
Where on Earth has our water come from?
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0CC02312D
Abstract: The presence of water in the Earth has long been an enigma. However, computer modelling techniques have shown that the adsorption of water onto the fractal surfaces of interplanetary dust particles, which are present in the planetary accretion disk, is sufficiently strong to provide a viable origin of terrestrial water.
Selective attachment of monovalent background electrolyte ions and growth inhibitors to polar steps on sulfates as studied by molecular simulations and AFM observations
Publisher: Informa UK Limited
Date: 06-2002
Calculation of the configurational entropy of Al, Si in layer silicates using the cluster variation method
Publisher: Springer Science and Business Media LLC
Date: 02-12-1998
Metastability in diffusing-reacting systems
Publisher: Elsevier BV
Date: 09-1994
Order/disorder phase transition in cordierite and its possible relationship to the development of symplectite reaction textures in granulites
Publisher: Pleiades Publishing Ltd
Date: 09-2007
In Celebration of 50 years of MSJ
Publisher: Japan Association of Mineralogical Sciences
Date: 2003
DOI: 10.2465/GKK.32.109
Aqueous corrosion of borosilicate glass under acidic conditions: A new corrosion mechanism
Publisher: Elsevier BV
Date: 06-2010
Pseudomorphic replacement of diopside during interaction with (Ni,Mg)Cl2 aqueous solutions: Implications for the Ni-enrichment mechanism in talc- and serpentine-type phases
Publisher: Elsevier BV
Date: 07-2014
Comment: Supersaturation in binary solid solution-Aqueous solution systems: (Comment on Crystallization kinetics in binary solid solution aqueous solution systems by Alexander G. Shtukenberg, Yurii
Publisher: American Journal of Science (AJS)
Date: 09-2007
DOI: 10.2475/07.2007.04
Mechanisms of Metasomatism and Metamorphism on the Local Mineral Scale: The Role of Dissolution-Reprecipitation During Mineral Re-equilibration
Publisher: Springer Berlin Heidelberg
Date: 06-04-2012
A model of the OH positions in olivine, derived from infrared-spectroscopic investigations
Publisher: Springer Science and Business Media LLC
Date: 02-1983
DOI: 10.1007/BF00308148
Mechanism and kinetics of pseudomorphic mineral replacement reactions: A case study of the replacement of pentlandite by violarite
Publisher: Elsevier BV
Date: 04-2009
Nanoscale growth of solids crystallising from multicomponent aqueous solutions
Publisher: Elsevier BV
Date: 11-2003
Valence state mapping and quantitative electron spectroscopic imaging of exsolution in titanohematite by energy-filtered TEM
Publisher: Springer Science and Business Media LLC
Date: 23-03-2001
Monte Carlo simulation of mixing in Ca3Fe2Ge3O12–Ca4Ge4O12 garnets and implications for the thermodynamic stability of pyrope–majorite solid solution
Publisher: Springer Science and Business Media LLC
Date: 17-10-2006
A spinel to β-phase transformation mechanism in (Mg,Fe)2SiO4
Publisher: Springer Science and Business Media LLC
Date: 04-1982
DOI: 10.1038/296729A0
Computing Lippmann diagrams from direct calculation of mixing properties of solid solutions: Application to the barite-celestite system
Publisher: Springer Science and Business Media LLC
Date: 2000
Heterojunction diodes formed using thin-film C containing polycrystalline diamond and Si
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 1990
DOI: 10.1109/55.46922
The microstructure of inclusions in nanocrystalline carbon films deposited at low temperature
Publisher: Elsevier BV
Date: 05-1994
Processes of oxidation and HCl-leaching of Tellnes ilmenite
Publisher: Elsevier BV
Date: 10-2011
Experimental study of the aragonite to calcite transition in aqueous solution
Publisher: Elsevier BV
Date: 10-2011
The transformation behaviour of cuprous sulphides and its application to the efficiency of CuxS–CdS solar cells
Publisher: Informa UK Limited
Date: 12-1976
The growth mechanisms of solid solutions crystallising from aqueous solutions
Publisher: Elsevier BV
Date: 03-2004
Stress orientation–dependent reactions during metamorphism
Publisher: Geological Society of America
Date: 04-01-2019
DOI: 10.1130/G45632.1
Experimental investigations into the silicification of olivine: Implications for the reaction mechanism and acid neutralization
Publisher: Mineralogical Society of America
Date: 20-09-2011
DOI: 10.2138/AM.2011.3779
Coupled mass transfer through a fluid phase and volume preservation during the hydration of granulite: An example from the Bergen Arcs, Norway
Publisher: Elsevier BV
Date: 11-2015
Metamorphic differentiation via enhanced dissolution along high strain pathways
Publisher: Copernicus GmbH
Date: 23-03-2020
DOI: 10.5194/EGUSPHERE-EGU2020-12939
Abstract: & & & span& Metamorphic differentiation, resulting in the segregation of minerals into compositional bands, is a common feature of metamorphic rocks. Considering the ubiquitous nature of compositionally layered metamorphic rocks, the processes that are responsible for metamorphic differentiation have received very little attention. The studied outcrop, located within the Bergen arcs of southwestern Norway, preserves the hydration of an anorthositic granulite at hibolite-facies conditions. The hibolite-facies hydration is expressed as both a statically hydrated hibolite and a shear zone rock, defined by the interlayering of hibolite with leucocratic domains. Detailed petrography, quantitative mineral chemistry and bulk rock analyses are applied to investigate compositional variation with assemblage microstructure. Within the outcrop, quartz-filled fractures and their associated hibolite alteration haloes, are observed crosscutting the granulite. These fractures are demonstrated to be relict of the initial fluid infiltration event. The fracture assemblage (quartz + plagioclase + zoisite + kyanite & #177 muscovite & #177 biotite) is equivalent to that occurring locally within leucocratic domains of the shear zone. Due to the textural and compositional similarities between quartz-filled fractures and leucocratic domains, the compositional layering of the shear zone rock may be directly linked to fracturing during initial fluid infiltration. & /span& & & & & & span& & & & & & & & & & & & Mass-balance and thermodynamic calculations indicate quartz-filled fractures and compositional differentiation of the shear zone form by internal fractionation rather than partial melting or precipitation of minerals from an eternally derived fluid. The process of internal fractionation within the shear zone is attributed to enhanced dissolution along fracture pathways, resulting in the loss of MgO, Fe& sub& & /sub& O& sub& & /sub& and K& sub& & /sub& O within leucocratic domains. These elements, being more mobile in the fluid, are then transported and ultimately either precipitated in hibolite lithologies or escape with the fluid, resulting in an overall volume loss in the shear zone. This inferred fluid connectivity combined with the enhanced local dissolution indicates the presence of a continuously replenished fluid along fracture pathways, leading to the overall conclusion that the mass transfer processes that result in metamorphic differentiation of the shear zone lithologies are dependent on both continuous fluid flux and heterogeneous strain distribution. & /span& & &
Fluid‐induced processes: metasomatism and metamorphism
Publisher: Wiley
Date: 05-2010
DOI: 10.1111/J.1468-8123.2010.00285.X
Abstract: Geofluids (2010) 10 , 254–269 Metamorphism and metasomatism both involve the reequilibration of mineral assemblages due to changes in pressure, temperature and/or chemical environment. Both processes involve material transport but on different length scales, so every metamorphic reaction is metasomatic on a local scale. Fluids provide a transport mechanism which is orders of magnitude faster than solid state diffusion and induce reequilibration through dissolution of parent phases and reprecipitation of products. Chemical weathering (kaolinitization and serpentinization), and albitization are used as ex les to describe the coupling between dissolution and precipitation. Albitization of feldspars in nature and in experiments is a pseudomorphic replacement which generates porosity in the albite. Porosity generation associated with interface‐coupled dissolution‐precipitation allows rapid material transport and together with fluid induced fracturing, is the mechanism of pervasive fluid flow through reacting crystals. Ex les of metamorphic reactions in granulite‐eclogite rocks illustrate the role of fluids in inducing chemical changes along fluid pathways. Microstructural criteria for a metamorphic event (i.e. change in P , T ) are critically reviewed by describing the corona formed by reaction between kyanite and garnet, as well as partial replacement textures. We conclude that both corona structures and partial replacement textures are equally indicative of a metasomatic reaction (driven by a fluid‐induced compositional change) as they may be of a metamorphic reaction driven by a change in P and/or T . This raises the question of the extent to which fluids play not only a catalytic role but also a thermodynamic role in determining the course of a metamorphic reaction.
Apatite and monazite: An effective duo to unravel superimposed fluid-flow and deformation events in reactivated shear zones
Publisher: Elsevier BV
Date: 12-2020
Molecular-scale surface processes during the growth of calcite in the presence of manganese
Publisher: Elsevier BV
Date: 09-2002
The distortion index in anhydrous Mg-Cordierite
Publisher: Springer Science and Business Media LLC
Date: 1980
DOI: 10.1007/BF01131999
Mineral Replacement Reactions
Publisher: Mineralogical Society of America
Date: 2009
The composition of solid solutions crystallising from aqueous solutions: the influence of supersaturation and growth mechanisms
Publisher: Elsevier BV
Date: 08-2000
Twinning in tetragonal leucite
Publisher: Springer Science and Business Media LLC
Date: 12-1988
DOI: 10.1007/BF00220699
The effect of barium on calcite {104} surfaces during growth
Publisher: Elsevier BV
Date: 09-2000
In situ atomic force microscope observations of a dissolution–crystallisation reaction: the phosgenite–cerussite transformation
Publisher: Elsevier BV
Date: 2000
Transformation of pentlandite to violarite under mild hydrothermal conditions
Publisher: Mineralogical Society of America
Date: 04-2006
DOI: 10.2138/AM.2006.2131
Crystalline diamond growth in thin films deposited from a CH4/Ar rf plasma
Publisher: AIP Publishing
Date: 14-08-1989
DOI: 10.1063/1.101808
Abstract: Observation of single-crystal diamond growth in thin films obtained from the rf decomposition of a CH4/Ar plasma is reported. The films were deposited on Si substrates which were kept at 20 °C. Polycrystalline diamond grains are seen over the entire film. Single-crystal diffraction patterns obtained from larger grains all show {111} twinning.
Neutron powder diffraction study of the �kermanite-gehlenite solid solution series
Publisher: Springer Science and Business Media LLC
Date: 09-1992
DOI: 10.1007/BF00202107
Twin formation and structural modulations in orthorhombic and tetragonal YBa2(Cu1-xCox)3O7-δ
Publisher: Informa UK Limited
Date: 12-1989
Formation of Mg-rich Olivine Pseudomorphs in Serpentinized Dunite from the Mesoarchean Nuasahi Massif, Eastern India: Insights into the Evolution of Fluid Composition at the Mineral–Fluid Interface
Publisher: Oxford University Press (OUP)
Date: 2016
Structural states of Mg-cordierite I: Order parameters from synchrotron X-ray and NMR data
Publisher: Springer Science and Business Media LLC
Date: 1987
DOI: 10.1007/BF00628822
In-situ neutron diffraction study of non-convergent cation ordering in the (Fe3O4) (sub 1-x) (MgAl2O4)xspinel solid solution
Publisher: Mineralogical Society of America
Date: 04-1999
DOI: 10.2138/AM-1999-0409
The kinetics of nucleation of solid solutions from aqueous solutions: a new model for calculating non-equilibrium distribution coefficients
Publisher: Elsevier BV
Date: 2002
Cordierite formation during the experimental reaction of plagioclase with Mg-rich aqueous solutions
Publisher: Springer Science and Business Media LLC
Date: 09-2014
Grain boundaries as reactive fluid pathways in rocks
Publisher: Copernicus GmbH
Date: 27-03-2022
DOI: 10.5194/EGUSPHERE-EGU22-2331
Abstract: & & The presence of aqueous fluids is ubiquitous in the Earth& #8217 s crust. Grain boundaries play an important role in enabling fluids to penetrate through the rock system. Their influence in fluid-rock reactions that might lead to relevant processes such as mineral replacements, the formation of new minerals and dissolution of others, element mobilization, variations in rock density, changes in stress distribution, mass transfer, etc., are commonly observed in many rock s les as well as generated and observed in laboratory experiments. As a product of these reactions, porosity and fractures might also be generated and potentially allow the fluid to penetrate even further.& & & & Here we present our first analyses on different rock s les where the fluid-rock interaction has been induced through hydrothermal laboratory experiments using either Carrara Marble or plagioclase s les. The evidence for such interactions having previously occurred in natural rocks has been investigated in a sequence of a granulite rock s les from the Bergen Arcs in Norway. Using light microscopy as well as SEM, EDX and Electron Microprobe analysis we have investigated possible fluid pathways and evidence of fluid-mineral reactions as well as the mechanisms that could explain such processes.& &
Forming Cohesive Calcium Oxalate Layers on Marble Surfaces for Stone Conservation
Publisher: American Chemical Society (ACS)
Date: 07-07-2014
DOI: 10.1021/CG500495A
Time-resolved monitoring of cement hydration: Influence of cellulose ethers on hydration kinetics
Publisher: Elsevier BV
Date: 08-2005
Nucleation of solid solutions crystallizing from aqueous solutions
Publisher: The Royal Society
Date: 29-01-2003
Abstract: The study of nucleation and growth mechanisms of salts from aqueous solutions, as a function of supersaturation, is described using both macroscopic and microscopic experiments. In situ observations in a fluid cell in an atomic force microscope (AFM) reveal phenomena not accounted for in standard crystal-growth theories, specifically on the role of the crystal structure of the substrate in controlling spiral growth and two-dimensional nucleation. As a model ex le, the crystallization of two isostructural salts, BaSO(4) and SrSO(4), is described. The growth of solid-solution crystals is considerably more complex. The supersaturation of a given aqueous solution relative to a solid solution is different with respect to each solid composition, and it leads to the possibility that different compositions can simultaneously grow by different mechanisms on the same crystal face. Oscillatory compositional zoning is another consequence of the interplay between the thermodynamics and the kinetics of nucleation. The factors which control nucleation and growth of the solid solution (Ba,Sr)SO(4) from an aqueous solution are described. The predictions made from the theory are compared with direct observations of crystal growth in an AFM.
Barite scale formation and dissolution at high ionic strength studied with atomic force microscopy
Publisher: Elsevier BV
Date: 11-2001
Timescales of geological processes: Preface
Publisher: Elsevier BV
Date: 2019
The role of grain boundaries and transient porosity in rocks as fluid pathways for reaction front propagation
Publisher: Elsevier BV
Date: 2014
A raman spectroscopic study of Al-Si ordering in synthetic magnesium cordierite
Publisher: Springer Science and Business Media LLC
Date: 05-1984
DOI: 10.1007/BF00311950
Hydrothermal replacement of Aragonite by Calcite: interplay between replacement, fracturing and growth
Publisher: Schweizerbart
Date: 12-06-2013
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