ORCID Profile
0000-0002-4519-7279
Current Organisation
CSIRO
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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)
Ore Deposit Petrology | Geology | Inorganic Geochemistry | Mineralogy and Crystallography | Hydrometallurgy | Functional Materials | Geochemistry | Metals and Alloy Materials | Structural Geology |
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Earth Sciences | Precious (Noble) Metal Ore Exploration | Mining and Extraction of Precious (Noble) Metal Ores | Expanding Knowledge in Engineering | Primary Mining and Extraction of Mineral Resources not elsewhere classified
Related Links
Publications
The Pilbara Mesoarchean conglomerate gold versus Quaternary colluvial gold: are they genetically linked?
Publisher: Informa UK Limited
Date: 11-11-2019
Geochemical signatures of copper redistribution in IOCG-type mineralisation, Gawler Craton, South Australia
Publisher: Springer Science and Business Media LLC
Date: 07-07-2018
A Microscale Analysis of Hydrothermal Epidote: Implications for the Use of Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry Mineral Chemistry in Complex Alteration Environments
Publisher: Society of Economic Geologists
Date: 06-2020
DOI: 10.5382/ECONGEO.4705
Abstract: High-resolution, quantitative imaging of epidote from the Ann Mason fault block, Yerington district, Nevada, using scanning electron microscopy (SEM), X-ray fluorescence (XRF), and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) has revealed at least two types of epidote (type 1 and type 2), each with different major and trace element chemistry. Type 1 epidote is coarser grained, typically greater than 50 μm in diameter, and forms euhedral crystals that display twins and sector zones enriched in Fe, Sr, and Mn. Type 2 epidote is finer grained, typically less than 30 μm in diameter, irregularly zoned with respect to Fe and Al, and forms polycrystalline aggregates that include void space. Two sources of intragranular compositional variability are defined in this study—one related to different generations of epidote only visible on the microscale, and the other related to crystallographic features such as sector zones and twins. Intragranular compositional variations within Yerington epidotes highlight the potential importance of detailed s le characterization in complex alteration environments prior to undertaking mineral chemistry studies in the context of resource exploration. Based on statistical analysis of LA-ICP-MS spot data from one s le, the optimal number of spot analyses to adequately represent the range in element concentrations within zoned or twinned crystals is determined to be at least 40.
Soft X-Ray and Cathodoluminescence Examination of a Tanzanian Graphite Deposit
Publisher: Oxford University Press (OUP)
Date: 06-04-2020
DOI: 10.1017/S1431927620001294
Abstract: Hyperspectral soft X-ray emission (SXE) and cathodoluminescence (CL) spectrometry have been used to investigate a carbonaceous-rich geological deposit to understand the crystallinity and morphology of the carbon and the associated quartz. Panchromatic CL maps show both the growth of the quartz and the evidence of recrystallization. A fitted CL map reveals the distribution of Ti 4+ within the grains and shows subtle growth zoning, together with radiation halos from 238 U decay. The sensitivity of the SXE spectrometer to carbon, together with the anisotropic X-ray emission from highly orientated pyrolytic graphite, has enabled the C Kα peak shape to be used to measure the crystal orientation of in idual graphite regions. Mapping has revealed that most grains are predominantly of a single orientation, and a number of graphite grains have been investigated to demonstrate the application of this new SXE technique. A peak fitting approach to analyzing the SXE spectra was developed to project the C Kα 2 p z and 2 p ( x + y ) orbital components of the graphite. The shape of these two end-member components is comparable to those produced by electron density of states calculations. The angular sensitivity of the SXE spectrometer has been shown to be comparable to that of electron backscatter diffraction.
Cubic zirconia in >2370 °C impact melt records Earth's hottest crust
Publisher: Elsevier BV
Date: 11-2017
The Neoarchean Conglomerate-Hosted Gold of the West Pilbara Craton, Western Australia
Publisher: Society of Economic Geologists
Date: 05-2021
DOI: 10.5382/ECONGEO.4790
Abstract: Recently discovered Au in boulder conglomerate between the Mesoarchean West Pilbara superterrane basement and the overlying volcano-sedimentary stratigraphy of the Neoarchean Fortescue Group in Western Australia has renewed comparisons with the Witwatersrand conglomerate Au deposits in South Africa. As such, this has reignited the question of the Pilbara and Kaapvaal cratons being linked as part of the postulated Vaalbara continent during the Archean. However, little is known about the origin of the Pilbara conglomerate Au and its host conglomerates, as they are hitherto unstudied, and their formation and/or source is uncertain. Here we present a detailed study on the textures, composition, and sedimentology of one newly discovered Pilbara conglomerate Au deposit at the base of the Neoarchean Fortescue Group in the northwestern Pilbara craton. The Pilbara conglomerate Au occurrences are characteristically Ag-bearing but Hg-poor polycrystalline discoid masses that are overgrown by Au-poor chloritic halos, which are further enveloped by a hydrothermal alteration halo of disseminated Au within chlorite. Both the discoids and the auriferous chlorite halo are Ag bearing, with up to ~9 wt % Ag, consistent with a hydrothermal (orogenic) origin. The discoids do not display any physical or chemical evidence for sedimentary transport thus, their formation (placer versus hydrothermal) remains unclear. However, the position of the Au in the conglomerate, limited to the basal section of the conglomerate, is difficult to account for in a purely hydrothermal deposit model. We argue the Pilbara conglomerate Au represents a modified placer deposit from a primary orogenic Au source, with surface evidence for sedimentation removed by partial dissolution during later hydrothermal alteration in the host conglomerate and the crystalline basement. While the basal Fortescue Group conglomerate Au shares commonalities with the time equivalent (& ~2.7 Ga) Venterspost Conglomerate Formation, which overlies the Witwatersrand Supergroup, inconsistencies remain, with different Au chemistries and tectonic, magmatic, sedimentary, and metamorphic-metallogenic histories of the Pilbara and Kaapvaal cratons prior to deposition of the & .7 Ga conglomerate sequences. This collectively indicates the drivers of Au metallogenesis and ultimate Au deposition in conglomerate facies were fundamentally different in the Pilbara and Kaapvaal cratons.
Carbonate Replacement as the Principal Ore Formation Process in the Proterozoic McArthur River (HYC) Sediment-Hosted Zn-Pb Deposit, Australia
Publisher: Society of Economic Geologists, Inc.
Date: 05-2021
DOI: 10.5382/ECONGEO.4793
Abstract: The McArthur River (HYC) Zn-Pb-Ag deposit in the Carpentaria Zn belt, northern Australia, is one of the world’s largest and most studied sediment-hosted base metal deposits, owing to its lack of deformation and preservation of sedimentary and ore textures. However, the ore formation process (syngenetic vs. epigenetic) is still a subject of controversy. In this paper we focus on key characteristics of the HYC deposit that remain unexplained: preservation of sedimentary carbonate (dolomite) and its association with Zn, and the role of thallium (Tl) and manganese (Mn) distribution in the orebody. Our findings demonstrate a sequence of events during ore formation: Tl is hosted almost exclusively within euhedral pyritic overgrowths around early diagenetic pyrite sphalerite mineralization occurred after Tl-bearing pyrite overgrowths, in association with acid dissolution (replacement) of laminated and nodular dolomite across the subbasin and outer rims are enriched in Mn on preserved dolomite at the dissolution reaction front in contact with sphalerite. New thermodynamic fluid chemistry modeling demonstrates the metal distribution and paragenesis can be explained by acidic, oxidized ore fluids entering the pyrite-dolomite host lithology, allowing reduction and pH buffering by acid carbonate dissolution, resulting in stepwise metal deposition in an evolving fluid. We argue this represents strong evidence for epigenetic ore formation at HYC. Furthermore, the primary control on ore deposition is not synsedimentary faulting in the subbasin rather, the chemical potential of sedimentary carbonate within reduced, sulfidic lithologies appears to be of critical importance to precipitation of sphalerite.
Plundering Carlow Castle: First Look at a Unique Mesoarchean-Hosted Cu-Co-Au Deposit
Publisher: Society of Economic Geologists
Date: 09-2019
DOI: 10.5382/ECONGEO.4672
Abstract: Economically significant and geologically complex veined Cu-Co-Au mineralization was recently discovered at Carlow Castle in the Pilbara region of northwestern Western Australia. The inferred resource estimate for Carlow Castle as of March 2019 is 7.7 million tonnes (Mt) at 1.06 g/t Au, 0.51% Cu, and 0.08% Co, making it one of Australia’s most significant known Cu-Co-Au deposits. Here we provide the first account and scientific analysis of Carlow Castle. This analysis suggests that it is a hydrothermal Cu-Co-Au deposit, with mineralization hosted in sulfide-rich quartz-carbonate veins. The ore is hosted in veins that occur within a pervasively chloritized shear zone through the regionally significant Regal thrust. At Carlow Castle the shear zone associated with this thrust occurs within the Ruth Well Formation, an Archean mafic volcano-sedimentary sequence. Within the mineralized veins the dominant ore minerals are pyrite (FeS2), chalcopyrite (CuFeS2), chalcocite (Cu2S), cobaltite (CoAsS), and electrum (Au,Ag). The genesis of the Carlow Castle deposit is still under investigation however, the origin of the Cu-Co-Au mineralization is most likely related to the migration of metalliferous fluids along the Regal thrust. Based on Carlow Castle’s stratigraphic position within the Pilbara craton and the craton’s relative stability since the Archean, an Archean age of mineralization is most likely. The distinct Cu-Co-Au enrichment at Carlow Castle makes it unique among Archean ore deposits generally, as the majority of Cu-Co deposits are of maximum Proterozoic age. Therefore, understanding the genesis of the Carlow Castle deposit has important implications for understanding the unique processes through which Cu-Co-Au mineralization outside of basin-hosted ore deposits may be formed, particularly in Archean terranes.
Geochemical and sedimentological characterization of the Proterozoic Blue Billy Formation shale-hosted Zn-Pb mineralization; Edmund Basin, Western Australia
Publisher: CSIRO
Date: 2018
EBSDinterp 1.0: A MATLAB® Program to Perform Microstructurally Constrained Interpolation of EBSD Data
Publisher: Oxford University Press (OUP)
Date: 16-07-2015
DOI: 10.1017/S1431927615000781
Abstract: EBSDinterp is a graphic user interface (GUI)-based MATLAB® program to perform microstructurally constrained interpolation of nonindexed electron backscatter diffraction data points. The area available for interpolation is restricted using variations in pattern quality or band contrast (BC). Areas of low BC are not available for interpolation, and therefore cannot be erroneously filled by adjacent grains “growing” into them. Points with the most indexed neighbors are interpolated first and the required number of neighbors is reduced with each successive round until a minimum number of neighbors is reached. Further iterations allow more data points to be filled by reducing the BC threshold. This method ensures that the best quality points (those with high BC and most neighbors) are interpolated first, and that the interpolation is restricted to grain interiors before adjacent grains are grown together to produce a complete microstructure. The algorithm is implemented through a GUI, taking advantage of MATLAB®’s parallel processing toolbox to perform the interpolations rapidly so that a variety of parameters can be tested to ensure that the final microstructures are robust and artifact-free. The software is freely available through the CSIRO Data Access Portal ( doi:10.4225/08/5510090C6E620 ) as both a compiled Windows executable and as source code.
How carbonate dissolution facilitates sediment-hosted Zn-Pb mineralisation
Publisher: Geological Society of America
Date: 23-07-2021
DOI: 10.1130/G49056.1
Abstract: Most of the world's Zn and Pb is extracted from sediment-hosted Zn-Pb deposits. The Zn-Pb deposits hosted in carbonate rocks are hypothesized to form by mixing of acidic metal-bearing brines with reduced sulfur-bearing fluids while dissolving sedimentary carbonate. To test the role of carbonate in this process, we conducted hydrothermal experiments simulating ore formation by reacting Zn ± Pb ± Ba–bearing brines with H2S and SO42– produced by native sulfur, with and without carbonate minerals (calcite or dolomite crystals), at 200 °C and water-saturated pressure. Sphalerite, galena, and barite (or anhydrite) crystals formed only when carbonate was present in the experiment, accompanied by carbonate dissolution. The textures of sphalerite clusters are similar to those observed in ancient and modern hydrothermal deposits. Thermodynamic modeling at 150 °C and 250 °C demonstrates that mixing of metal-rich brines and H2S causes most of the Zn in solution to precipitate as sphalerite only when carbonate dissolution occurs to buffer the pH, consistent with the experimental observations. The need for a pH buffer increases with increasing temperature, and different pH buffers may play a role for different deposit types. We propose that carbonate-buffered fluid mixing is a critical process for forming post-sedimentary Zn ± Pb ± Ba deposits in sedimentary carbonate rocks.
Phase equilibria modelling constraints on P?T conditions during fluid catalysed conversion of granulite to eclogite in the Bergen Arcs, Norway
Publisher: Wiley
Date: 20-12-2018
DOI: 10.1111/JMG.12294
Capricorn SIEF Project - Integrated, mineralogical, petrophysical and structural characterisation - Part 4: Magnetic Modelling, Data Integration and Exploration Implications
Publisher: CSIRO
Date: 2018
Mineralogy and geochemistry of atypical reduction spheroids from the Tumblagooda Sandstone, Western Australia
Publisher: Wiley
Date: 08-10-2019
DOI: 10.1111/SED.12659
Crystallographic Orientation Information by Soft X-Ray Spectroscopy
Publisher: Oxford University Press (OUP)
Date: 08-2018
Numerical analysis of fold curvature using data acquired by high-precision GPS
Publisher: Elsevier BV
Date: 09-2006
Capricorn SIEF Distal Footprints Project - Integrated mineralogical, petrophysical and structural characterisation - Part 2: The Horseshoe Range
Publisher: CSIRO
Date: 2018
EBSDinterp Demonstration Data 1 - Fractured Albite
Publisher: No publisher found
Deformed monazite yields high-temperature tectonic ages
Publisher: Geological Society of America
Date: 05-2015
DOI: 10.1130/G36533.1
Grain boundaries as microreactors during reactive fluid flow: experimental dolomitization of a calcite marble
Publisher: Springer Science and Business Media LLC
Date: 08-2014
Junction Deposit Carbonate Study EBSD
Publisher: No publisher found
Shock-produced high-pressure (La, Ce, Th)PO4 polymorph revealed by microstructural phase heritage of monazite
Publisher: Geological Society of America
Date: 16-04-2019
DOI: 10.1130/G46008.1
Complex mineral zoning patterns caused by ultra-local equilibrium atreaction interfaces
Publisher: Geological Society of America
Date: 05-2014
DOI: 10.1130/G35287.1
TCInvestigator: Automated calculation of mineral mode and composition contours for thermocalc pseudosections
Publisher: Wiley
Date: 13-03-2015
DOI: 10.1111/JMG.12126
Characterisation of the Neoarchean Fortescue Group Stratigraphy – Integrated downhole geochemical and mineralogical correlation from new diamond drilling
Publisher: Informa UK Limited
Date: 11-11-2019
The variation and visualisation of elastic anisotropy in rock-forming minerals
Publisher: Copernicus GmbH
Date: 02-03-2020
Abstract: Abstract. All minerals behave elastically elasticity is a rheological property that controls their ability to support stress, strain, and pressure controls the nature of acoustic wave propagation and influences subsequent plastic (i.e. permanent non-reversible) deformation. All minerals are intrinsically anisotropic in their elastic properties – that is, they have directional variations that are related to the configuration of the crystal lattice. This means that the commonly used mechanical elastic properties that relate elastic stress to elastic strain, including Young's modulus (E), Poisson's ratio (ν), shear modulus (G) and linear compressibility (β), are dependent on crystallographic direction. In this paper, we explore the ranges of anisotropy of E, ν, G and β in 86 rock-forming minerals, using previously published data, and show that the range is much wider than commonly assumed. We also explore how these variations (the directionality and the magnitude) are important for fundamental processes in the solid earth, including deformation (mechanical) twinning, coherent phase transformations and brittle failure. We present a new open-source software package (AnisoVis, written in MATLAB), which we use to calculate and visualise directional variations in elastic properties of rock-forming minerals. Following previous work in the fields of chemistry and materials science, we demonstrate that by visualising the variations in elasticity, we discover previously unreported properties of rock-forming minerals. For ex le, we show previously unreported directions of negative Poisson's ratio and negative linear compressibility, and we show that the existence of these features is more widespread (i.e. present in many more minerals) than previously thought. We illustrate the consequences of intrinsic elastic anisotropy for the elastic normal and shear strains within α-quartz single crystal under different applied stress fields the role of elastic anisotropy on Dauphiné twinning and the α–β phase transformations in quartz and stress distributions around voids of different shapes in talc, lizardite, albite, and sanidine. In addition to our specific ex les, elastic anisotropy in rock-forming minerals, to the degree that we describe, has significant consequences for seismic (acoustic) anisotropy, for the focal mechanisms of earthquakes in anisotropic source regions (e.g. subducting slabs), for a range of brittle and ductile deformation mechanisms in minerals, and for geobarometry using mineral inclusions.
Review of “Nano-scale earthquake record preserved in plagioclase microfractures from the lower continental crust”
Publisher: Copernicus GmbH
Date: 08-12-2020
The variation and visualisation of elastic anisotropy in rock forming minerals
Publisher: Copernicus GmbH
Date: 11-11-2019
DOI: 10.5194/SE-2019-168
Abstract: Abstract. All minerals behave elastically, a rheological property that controls their ability to support stress, strain and pressure, the nature of acoustic wave propagation and influences subsequent plastic (i.e. permanent, non-reversible) deformation. All minerals are intrinsically anisotropic in their elastic properties – that is, they have directional variations that are related to the configuration of the crystal lattice. This means that the commonly used mechanical elastic properties that relate elastic stress to elastic strain, including Young's modulus (E), Poisson's ratio (ν), shear modulus (G) and linear compressibility (β), are dependent on crystallographic direction. In this paper, we explore the ranges of anisotropy of E, ν, G and β in 86 rock-forming minerals, using previously published data, and show that the range is much wider than commonly assumed. We also explore how these variations (the directionality and the magnitude) are important for fundamental processes in the solid earth, including deformation (mechanical) twinning, coherent phase transformations and brittle failure. We present a new open source software package (AnisoVis, written in MATLAB), which we use to calculate and visualise directional variations in elastic properties of rock-forming minerals. Following previous work in the fields of chemistry and materials, we demonstrate that by visualising the variations in elasticity, we discover previously unreported properties of rock forming minerals. For ex le, we show previously unreported directions of negative Poisson's ratio and negative linear compressibility and we show that the existence of these features is more widespread (i.e. present in many more minerals) than previously thought. We illustrate the consequences of intrinsic elastic anisotropy for the elastic normal and shear strains within α-quartz single crystal under different applied stress fields the role of elastic anisotropy on Dauphiné twinning and the α-β phase transformations in quartz and stress distributions around voids of different shapes in talc, lizardite, albite, and sanidine. In addition to our specific ex les, elastic anisotropy in rock-forming minerals to the degree that we describe has significant consequences for seismic (acoustic) anisotropy, the focal mechanisms of earthquakes in anisotropic source regions (e.g. subducting slabs), for a range of brittle and ductile deformation mechanisms in minerals, and geobarometry using mineral inclusions.
A new mode of mineral replacement reactions involving the synergy between fluid-induced solid-state diffusion and dissolution-reprecipitation: A case study of the replacement of bornite by copper sulfides
Publisher: Elsevier BV
Date: 08-2022
A pressure-temperature phase diagram for zircon at extreme conditions
Publisher: Elsevier BV
Date: 02-2017
The microstructural character and mechanical significance of fault rocks associated with a continental low-angle normal fault: the Zuccale Fault, Elba Island, Italy
Publisher: Geological Society of London
Date: 2011
DOI: 10.1144/SP359.6
Relative strength of mafic and felsic rocks during amphibolite facies metamorphism and deformation
Publisher: Elsevier BV
Date: 04-2011
Junction Deposit Carbonate Study Chemical Maps
Publisher: No publisher found
Further evidence for ~8 kbar amphibolite facies metamorphism in the Marymia Inlier, Western Australia
Publisher: Informa UK Limited
Date: 19-09-2014
Working up an Apatite: Enigmatic Mesoarchean Hydrothermal Cu-Co-Au Mineralization in the Pilbara Craton
Publisher: Society of Economic Geologists, Inc.
Date: 11-2021
DOI: 10.5382/ECONGEO.4842
Abstract: Globally, significant ex les of hydrothermal Cu-Co mineralization are rare within Archean greenstone belts, especially relative to the endowment of these terranes with other world-class hydrothermal ore deposits, particularly Au deposits. Using U-Pb geochronology of hydrothermal apatite, this study provides the first absolute age constraints on the timing of mineralization for the Carlow Castle Cu-Co-Au deposit. Carlow Castle is a complex, shear zone-hosted, veined Cu-Co-Au mineral system situated within the Paleo-Mesoarchean Roebourne greenstone belt of the Pilbara craton of northwestern Western Australia. Although U-Pb geochronology of this deposit is challenging due to low levels of radiogenic Pb in synmineralization apatite, mineralization is best estimated at 2957 ± 67 Ma (n = 61). Additionally, analysis of alteration phases associated with Carlow Castle mineralization suggests that it is dominated by a propylitic assemblage that is characteristic of alkaline fluid chemistry and peak temperatures & °C. Within proximal portions of the northwest Pilbara craton, the period of Carlow Castle’s formation constrained here is associated with significant base-metal volcanogenic massive sulfide mineralization and magmatic activity related to back-arc rifting. This rifting and associated magmatic activity are the most likely source of Carlow Castle’s unique Cu-Co-Au mineralization. Carlow Castle’s Mesoarchean mineralization age makes it among the oldest discovered Cu-Co-Au deposits globally, and unique in the broader context of hydrothermal Cu-Co-Au deposits. Globally, hydrothermal Cu-Co mineralization occurs almost exclusively as Proterozoic and Phanerozoic stratiform sediment-hosted Cu-Co deposits due to the necessity of meteorically derived oxidized ore fluids in their formation. This research therefore has implications for exploration for atypical Cu-Co deposits and Cu-Co metallogenesis through recognition of comparably uncommon magmatic-hydrothermal Cu-Co-Au ore-forming processes and, consequently, the potential for analogous Cu-Co-Au mineralization in other Archean greenstone belts.
Improving Automated Geological Logging of Drill Holes by Incorporating Multiscale Spatial Methods
Publisher: Springer Science and Business Media LLC
Date: 11-03-2020
DOI: 10.1007/S11004-020-09859-0
Abstract: Manually interpreting multivariate drill hole data is very time-consuming, and different geologists will produce different results due to the subjective nature of geological interpretation. Automated or semi-automated interpretation of numerical drill hole data is required to reduce time and subjectivity of this process. However, results from machine learning algorithms applied to drill holes, without reference to spatial information, typically result in numerous small-scale units. These small-scale units result not only from the presence of very small rock units, which may be below the scale of interest, but also from misclassification. A novel method is proposed that uses the continuous wavelet transform to identify geological boundaries and uses wavelet coefficients to indicate boundary strength. The wavelet coefficient is a useful measure of boundary strength because it reflects both wavelength and litude of features in the signal. This means that boundary strength is an indicator of the apparent thickness of geological units and the amount of change occurring at each geological boundary. For multivariate data, boundaries from multiple variables are combined and multiscale domains are calculated using the combined boundary strengths. The method is demonstrated using multi-element geochemical data from mineral exploration drill holes. The method is fast, reduces misclassification, provides a choice of scales of interpretation and results in hierarchical classification for large scales where domains may contain more than one rock type.
Robust best-fit planes from geospatial data
Publisher: Geological Society of America
Date: 25-11-2015
DOI: 10.1130/GES01247.1
Distinguishing regional- and local-scale metasomatic systems at the Prairie Downs Zn-Pb deposit
Publisher: Elsevier BV
Date: 10-2016
Deformed monazite yields high-temperature tectonic ages
Publisher: Geological Society of America
Date: 23-12-2015
DOI: 10.1130/G37474Y.1
Geochemical and sedimentological characterization of the Proterozoic Blue Billy Formation shale-hosted Zn-Pb mineralization; Edmund Basin, Western Australia
Publisher: CSIRO
Date: 2018
Phase heritage during replacement reactions in Ti-bearing minerals
Publisher: Springer Science and Business Media LLC
Date: 03-2021
Microstructural constraints on the mechanisms of the transformation to reidite in naturally shocked zircon
Publisher: Springer Science and Business Media LLC
Date: 2017
Shocked monazite chronometry: integrating microstructural and in situ isotopic age data for determining precise impact ages
Publisher: Springer Science and Business Media LLC
Date: 16-02-2017
Reconstructing the pyrite deformation mechanism map
Publisher: Elsevier BV
Date: 08-2011
Microstructural and metamorphic constraints on the thermal evolution of the Southern Region of the Lewisian Gneiss Complex, NWScotland
Publisher: Oxford University Press (OUP)
Date: 24-09-2014
The genesis of Carlow Castle: A unique Australian orogenic Cu-Co-Au deposit in the Archean Pilbara Craton
Publisher: Informa UK Limited
Date: 11-11-2019
Empirical constraints on shock features in monazite using shocked zircon inclusions
Publisher: Geological Society of America
Date: 08-07-2016
DOI: 10.1130/G37979.1
Primary cumulus platinum minerals in the Monts de Cristal Complex, Gabon: magmatic microenvironments inferred from high-definition X-ray fluorescence microscopy
Publisher: Springer Science and Business Media LLC
Date: 25-02-2016
Grain growth and the lifetime of diffusion creep deformation
Publisher: Geological Society of London
Date: 2011
DOI: 10.1144/SP360.15
Low temperature recrystallisation of alluvial gold in paleoplacer deposits
Publisher: Elsevier BV
Date: 08-2017
Reaction mechanism for the replacement of calcite by dolomite and siderite: Implications for geochemistry, microstructure and porosity evolution during hydrothermal mineralisation
Publisher: Springer Science and Business Media LLC
Date: 25-06-2013
Spatial association between platinum minerals and magmatic sulfides imaged with the Maia Mapper and implications for the origin of the chromite-sulfide-PGE association
Publisher: Mineralogical Association of Canada
Date: 27-05-2021
Abstract: The spatial association between Pt minerals, magmatic sulfides, and chromite has been investigated using microbeam X-ray fluorescence (XRF) element mapping and the Maia Mapper. This lab-based instrument combines the Maia parallel energy dispersive (ESD) detector array technology with a focused X-ray beam generated from a liquid metal source. It proves to be a powerful technique for imaging Pt distribution at low-ppm levels on minimally prepared cut rock surfaces over areas of tens to hundreds of square centimeters, an ideal scale for investigating these relationships. Images of a selection of s les from the Bushveld Complex and from the Norilsk-Talnakh ore deposits (Siberia) show strikingly close association of Pt hotspots, equated with the presence of Pt-rich mineral grains, with magmatic sulfide blebs in all cases, except for a taxitic low-S ore s le from Norilsk. In all of the Bushveld s les, at least 75% of Pt hotspots (by number) occur at or within a few hundred microns of the outer edges of sulfide blebs. In s les from the leader seams of the UG2 chromitite, sulfides and platinum hotspots are also very closely associated with the chromite seams and are almost completely absent from the intervening pyroxenite. In the Merensky Reef, the area ratio of Pt hotspots to sulfides is markedly higher in the chromite stringers than in the silicate-dominated lithologies over a few centimeters either side. We take these observations as confirmation that sulfide liquid is indeed the prime collector for Pt and, by inference, for the other platinum group elements (PGEs) in all these settings. We further propose a mechanism for the sulfide-PGE-chromite association in terms of in situ heterogeneous nucleation of all these phases coupled with transient sulfide saturation during chromite growth and subsequent sulfide loss by partial re-dissolution. In the case of the amygdular Norilsk taxite, the textural relationship and high PGE/S ratio is explained by extensive loss of S to an escaping aqueous vapor phase.
Modelling grain-recycling zoning during metamorphism
Publisher: Wiley
Date: 05-2010
Quantitative Analysis of EBSD Data in Rocks and other Crystalline Materials: Investigation of Strain Induced Recrystallisation and Growth of New Phases
Publisher: Trans Tech Publications, Ltd.
Date: 04-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.715-716.62
Abstract: Misorientation can be calculated over large datasets and a theme of this paper is the usefulness of examining the results statistically. Comparing the statistics of misorientations calculated from neighbouring pixels (or grains) with those calculated from pairs of pixels (or grains) selected at random helps to indicate deformation and recrystallisation mechanisms. Taking boundary length into account provides a link to grain boundary energy, and boundary length versus misorientation data should be used to examine how boundaries with different misorientations evolve through time. Time lapse misorientation maps indicate how orientation changes through time at particular points in a microstructure during in situ experiments. The size of areas which have changed orientation by particular amounts can be linked to boundary length and boundary migration velocities. When dealing with different phases, the statistics of angular relationships, akin to intraphase misorientation analysis, can indicate orientation relationships in the absence of prior knowledge, which is advantageous in investigating the plethora of minerals that make up the Earth.
Fabrics produced mimetically during static metamorphism in retrogressed eclogites from the Zermatt-Saas zone, Western Italian Alps
Publisher: Elsevier BV
Date: 11-2012
Maia Mapper: High Definition XRF Imaging of Geological Samples at Intermediate Spatial Scales
Publisher: Oxford University Press (OUP)
Date: 08-2018
The impact of hydrothermal mineral replacement reactions on the formation and alteration of carbonate-hosted polymetallic sulfide deposits: A case study of the Artemis prospect, Queensland, Australia
Publisher: Elsevier BV
Date: 2020
Role of elastic anisotropy in the development of deformation microstructures in zircon
Publisher: Wiley
Date: 12-2017
Lithospheric-scale transtension between vertical, non-parallel, planar zone boundaries
Publisher: Informa UK Limited
Date: 03-2008
New shock microstructures in titanite (CaTiSiO5) from the peak ring of the Chicxulub impact structure, Mexico
Publisher: Springer Science and Business Media LLC
Date: 05-2019
The mechanism and kinetics of the transformation from marcasite to pyrite: in situ and ex-situ experiments and geological implications
Publisher: Springer Science and Business Media LLC
Date: 03-2020
Maia Mapper: High definition XRF imaging in the lab
Publisher: IOP Publishing
Date: 13-03-2018
Arsenic in hydrothermal apatite: Oxidation state, mechanism of uptake, and comparison between experiments and nature
Publisher: Elsevier BV
Date: 2017
Microscale data to macroscale processes: a review of microcharacterization applied to mineral systems
Publisher: Geological Society of London
Date: 19-04-2018
DOI: 10.1144/SP453.3
The Maia detector and event mode
Publisher: Informa UK Limited
Date: 02-11-2018
EBSDinterp Demonstration Data 2 - Twinned Plagioclase
Publisher: No publisher found
Quantification of fold curvature and fracturing using terrestrial laser scanning
Publisher: American Association of Petroleum Geologists AAPG/Datapages
Date: 05-2011
DOI: 10.1306/11051010026
Junction Deposit Carbonate Study Images
Publisher: No publisher found
Reaction coronas at olivine-plagioclase contacts in host rocks from the Nova-Bollinger Ni-Cu-Co deposit, Albany-Fraser Orogen, Western Australia: evidence of a magmatic to metamorphic continuum
Publisher: Oxford University Press (OUP)
Date: 21-06-2021
DOI: 10.1093/PETROLOGY/EGAB055
Abstract: A prominent feature of the cumulate rocks of the Nova intrusions is the presence of reaction coronas between olivine and plagioclase. A particular spatial arrangement of mineral textures, typical of olivine–plagioclase coronas in high-P troctolites and olivine gabbros worldwide, is almost universally observed: partially resorbed olivine with a cuspate margin, surrounded by orthopyroxene, surrounded by a zone of symplectite comprising hornblende + clinopyroxene, orthopyroxene and Cr-poor Al–(Fe, Mg) spinel, with a cuspate boundary against plagioclase. Where hibole-free clinopyroxene–spinel symplectite is developed it is typically as an outer layer against plagioclase. The mineralogy and composition of these coronas has been revealed by a combination of scanning electron microscopy and synchrotron X-ray fluorescence microscopy. There is a close spatial association between reaction symplectites and Bowen reaction series sequences developed by reaction between cumulus phases and fractionated trapped interstitial melt, giving rise to local Cr and Ti enrichment within the coronas relative to olivine and plagioclase, accompanying enrichment in water recorded by stabilization of hibole. These relationships imply that trapped liquid crystallization and corona formation were part of a process continuum, such that the coronas record mineral reactions close to the solidus temperature of the cumulates, initially developing in the presence of evolved hydrous interstitial liquid and continuing to develop in the solid state below the solidus. The symplectites owe their fine microstructure to diffusion-limited growth of the products of solid-state reactions below the solidus. The initial magmatic stage of corona formation records conditions of 0·76 and 0·96 GPa and around 1035 °C based on THERMOCALC pseudosections calculated for the bulk composition of the corona assemblage. Two-pyroxene assemblages within the symplectites record temperatures around 850–900 °C and pressures between 0·7 and 1·1 GPa. These pressure estimates are in good agreement with those obtained from regional metamorphism studies of the country rock paragneisses, confirming independent lines of evidence that the Nova intrusions were syn-metamorphic, emplaced under granulite-facies peak metamorphic conditions at crustal depths of 28–35 km. The unusually extensive development of the symplectites reflects the cooling history of the intrusions, which remained at temperatures close to solidus temperatures on the timescale of regional tectonic uplift and cooling of the deep roots of the orogen.
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Commonwealth Scientific And Industrial Research Organisation
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University Of Leeds Faculty Of Environment
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