ORCID Profile
0000-0001-7510-0223
Current Organisation
Macquarie University
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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 | Mineralogy and Crystallography | Geochemistry | Inorganic Geochemistry | Isotope Geochemistry | Ore Deposit Petrology | Archaeological Science | Geodynamics | Tectonics
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Earth Sciences | Mineral Exploration not elsewhere classified | Mineral Resources (excl. Energy Resources) not elsewhere classified | Understanding Australia's Past |
Related Links
Publications
Recycling plus: A new recipe for the formation of Alpine–Himalayan orogenic mantle lithosphere
Publisher: Elsevier BV
Date: 2013
Restoration of premetasomatic protolith compositions in mantle xenoliths
Publisher: Elsevier BV
Date: 08-2006
Terpenoid composition and origin of amber from the Cape York Peninsula, Australia
Publisher: Informa UK Limited
Date: 03-10-2014
Carbonate-rich crust subduction drives the deep carbon and chlorine cycles
Publisher: Springer Science and Business Media LLC
Date: 09-08-2023
Liquid immiscibility and melt segregation in alkaline lamprophyres from Labrador
Publisher: Elsevier BV
Date: 1984
Goldschmidt Abstracts 2009 – B
Publisher: Elsevier BV
Date: 06-2009
The oxidation state of lamproitic magmas
Publisher: Springer Science and Business Media LLC
Date: 1985
DOI: 10.1007/BF01082963
The composition of near-solidus melts of peridotite in the presence of CO2 and H2O between 40 and 60 kbar
Publisher: Elsevier BV
Date: 11-2009
Improved oxygen‐buffering techniques for C‐O‐H fluid‐saturated experiments at high pressure
Publisher: American Geophysical Union (AGU)
Date: 10-04-1989
Sediment-Peridotite Reaction Controls Fore-Arc Metasomatism and Arc Magma Geochemical Signatures
Publisher: MDPI AG
Date: 03-09-2021
DOI: 10.3390/GEOSCIENCES11090372
Abstract: Subduction of oceanic crust buries an average thickness of 300–500 m of sediment that eventually dehydrates or partially melts. Progressive release of fluid/melt metasomatizes the fore-arc mantle, forming serpentinite at low temperatures and phlogopite-bearing pyroxenite where slab surface reaches 700–900 °C. This is sufficiently high to partially melt subducted sediments before they approach the depths where arc magmas are formed. Here, we present experiments on reactions between melts of subducted sediments and peridotite at 2–6 GPa/750–1100 °C, which correspond to the surface of a subducting slab. The reaction of volatile-bearing partial melts derived from sediments with depleted peridotite leads to separation of elements and a layered arrangement of metasomatic phases, with layers consisting of orthopyroxene, mica-pyroxenite, and clinopyroxenite. The selective incorporation of elements in these metasomatic layers closely resembles chemical patterns found in K-rich magmas. Trace elements were imaged using LA-ICP-TOFMS, which is applied here to investigate the distribution of trace elements within the metasomatic layers. Experiments of different duration enabled estimates of the growth of the metasomatic front, which ranges from 1–5 m/ky. These experiments explain the low contents of high-field strength elements in arc magmas as being due to their loss during melting of sedimentary materials in the fore-arc.
Fractionation of sulfur isotopes during heterogeneous oxidation of SO<sub>2</sub> on sea salt aerosol: a new tool to investigate non-sea salt sulfate production in the mari
Publisher: Copernicus GmbH
Date: 24-05-2012
Abstract: Abstract. The oxidation of SO2 to sulfate on sea salt aerosols in the marine environment is highly important because of its effect on the size distribution of sulfate and the potential for new particle nucleation from H2SO4 (g). However, models of the sulfur cycle are not currently able to account for the complex relationship between particle size, alkalinity, oxidation pathway and rate – which is critical as SO2 oxidation by O3 and Cl catalysis are limited by aerosol alkalinity, whereas oxidation by hypohalous acids and transition metal ions can continue at low pH once alkalinity is titrated. We have measured 34S/32S fractionation factors for SO2 oxidation in sea salt, pure water and NaOCl aerosol, as well as the pH dependency of fractionation. Oxidation of SO2 by NaOCl aerosol was extremely efficient, with a reactive uptake coefficient of ≈0.5, and produced sulfate that was enriched in 32S with αOCl = 0.9882±0.0036 at 19 °C. Oxidation on sea salt aerosol was much less efficient than on NaOCl aerosol, suggesting alkalinity was already exhausted on the short timescale of the experiments. Measurements at pH = 2.1 and 7.2 were used to calculate fractionation factors for each step from SO2(g) → multiple steps → SOOCl2−. Oxidation on sea salt aerosol resulted in a lower fractionation factor than expected for oxidation of SO32− by O3 (αseasalt = 1.0124±0.0017 at 19 °C). Comparison of the lower fractionation during oxidation on sea salt aerosol to the fractionation factor for high pH oxidation shows HOCl contributed 29% of S(IV) oxidation on sea salt in the short experimental timescale, highlighting the potential importance of hypohalous acids in the marine environment. The sulfur isotope fractionation factors measured in this study allow differentiation between the alkalinity-limited pathways – oxidation by O3 and by Cl catalysis (α34 = 1.0163±0.0018 at 19 °C in pure water or 1.0199±0.0024 at pH = 7.2) – which favour the heavy isotope, and the alkalinity non-limited pathways – oxidation by transition metal catalysis (α34 = 0.9905±0.0031 at 19 °C, Harris et al., 2012a) and by hypohalites (α34 = 0.9882±0.0036 at 19 °C) – which favour the light isotope. In combination with field measurements of the oxygen and sulfur isotopic composition of SO2 and sulfate, the fractionation factors presented in this paper may be capable of constraining the relative importance of different oxidation pathways in the marine boundary layer.
Rapid quench piston cylinder apparatus: An improved design for the recovery of volatile-rich geological glasses from experiments at 0.5–2.5 GPa
Publisher: AIP Publishing
Date: 05-2023
DOI: 10.1063/5.0129417
Abstract: The accurate and precise determination of the compositions of silicate glasses formed from melts containing volatile components H2O and CO2 recovered from high-pressure, high-temperature experiments is essential to our understanding of geodynamic processes taking place within the planet. Silicate melts are often difficult to analyze chemically because the formation of quench crystals and overgrowths on silicate phases is rapid and widespread upon quenching of experiments, preventing the formation of glasses in low-SiO2 and volatile-rich compositions. Here, we present experiments conducted in a novel rapid quench piston cylinder apparatus on a series of partially molten low-silica alkaline rock compositions (l roite, basanite, and calk-alkaline basalt) with a range of water contents between 3.5 and 10 wt %. Quench modification of the volatile-bearing silicate glasses is significantly reduced compared to those produced in older piston cylinder apparatuses. The recovered glasses are almost completely free of quench modification and facilitate the determination of precise chemical compositions. We illustrate significantly improved quench textures and provide an analytical protocol that recovers accurate chemical compositions from both poorly quenched and well-quenched silicate glasses.
Sulfur isotope fractionation during heterogeneous oxidation of SO<sub>2</sub> on mineral dust
Publisher: Copernicus GmbH
Date: 04-06-2012
Abstract: Abstract. Mineral dust is a major fraction of global atmospheric aerosol, and the oxidation of SO2 on mineral dust has implications for cloud formation, climate and the sulfur cycle. Stable sulfur isotopes can be used to understand the different oxidation processes occurring on mineral dust. This study presents measurements of the 34S/32S fractionation factor α34 for oxidation of SO2 on mineral dust surfaces and in the aqueous phase in mineral dust leachate. Sahara dust, which accounts for ~60% of global dust emissions and loading, was used for the experiments. The fractionation factor for aqueous oxidation in dust leachate is αleachate = 0.9917±0.0046, which is in agreement with previous measurements of aqueous SO2 oxidation by iron solutions. This fractionation factor is representative of a radical chain reaction oxidation pathway initiated by transition metal ions. Oxidation on the dust surface at subsaturated relative humidity (RH) had an overall fractionation factor of αhet = 1.0096±0.0036 and was found to be almost an order of magnitude faster when the dust was simultaneously exposed to ozone, light and RH of ~40%. However, the presence of ozone, light and humidity did not influence isotope fractionation during oxidation on dust surfaces at subsaturated relative humidity. All the investigated reactions showed mass-dependent fractionation of 33S relative to 34S. A positive matrix factorization model was used to investigate surface oxidation on the different components of dust. Ilmenite, rutile and iron oxide were found to be the most reactive components, accounting for 85% of sulfate production with a fractionation factor of α34 = 1.012±0.010. This overlaps within the analytical uncertainty with the fractionation of other major atmospheric oxidation pathways such as the oxidation of SO2 by H2O2 and O3 in the aqueous phase and OH in the gas phase. Clay minerals accounted for roughly 12% of the sulfate production, and oxidation on clay minerals resulted in a very distinct fractionation factor of α34 = 1.085±0.013. The fractionation factors measured in this study will be particularly useful in combination with field and modelling studies to understand the role of surface oxidation on clay minerals and aqueous oxidation by mineral dust and its leachate in global and regional sulfur cycles.
Evolution of the Archaean crust by delamination and shallow subduction
Publisher: Springer Science and Business Media LLC
Date: 2003
DOI: 10.1038/NATURE01319
Fe-rich Dunite Xenoliths from South African Kimberlites: Cumulates from Karoo Flood Basalts
Publisher: Oxford University Press (OUP)
Date: 03-04-2007
Ultrapotassic Mafic Rocks as Geochemical Proxies for Post-collisional Dynamics of Orogenic Lithospheric Mantle: the Case of Southwestern Anatolia, Turkey
Publisher: Oxford University Press (OUP)
Date: 19-03-2012
High-pressure synthesis of priderite and members of the lindsleyite-mathiasite and hawthorneite-yimengite series
Publisher: Springer Science and Business Media LLC
Date: 1994
DOI: 10.1007/BF00286840
Diamonds, dunites, and metasomatic rocks formed by melt/rock reaction in craton roots
Publisher: Springer Science and Business Media LLC
Date: 28-11-2022
DOI: 10.1038/S43247-022-00630-3
Abstract: The thick mantle lithosphere beneath cratons consists of strongly reduced rocks that have reacted with oxidized melts. These low-silica, incipient melts are rich in CO 2 and H 2 O and react with surrounding rocks forming an enriched zone at the base of the lithosphere, which is the source region for many diamonds. Here, we reproduce these reactions in novel experiments in which oxidised, hydrous carbonate-rich melts are reacted with reduced, depleted peridotite at 5 GPa pressure. Results explain several key features of the mantle s le in kimberlites as products of a single process, namely the formation of diamonds, phlogopite and alkali- hibole bearing rocks, iron-rich dunites, and garnets and clinopyroxenes with pyroxenitic compositions. Initially, redox freezing occurs where melts meet the reduced peridotite, depositing diamonds and associated garnet and clinopyroxenes. The spreading reaction front leaves behind Fe-rich dunite, and crystallizing phlogopite and hibole when the melt solidifies at the reaction front.
Low-pressure fractionation of the Nyiragongo volcanic rocks, Virunga Province, D.R. Congo
Publisher: Elsevier BV
Date: 09-2004
Low Ni olivine in silica-undersaturated ultrapotassic igneous rocks as evidence for carbonate metasomatism in the mantle
Publisher: Elsevier BV
Date: 06-2016
Internal Differentiation of the Archean Continental Crust: Fluid-Controlled Partial Melting of Granulites and TTG-Amphibolite Associations in Central Finland
Publisher: Oxford University Press (OUP)
Date: 07-01-2009
Os-isotope constraints on the dynamics of orogenic mantle: The case of the Central Balkans
Publisher: Elsevier BV
Date: 06-2015
A Reappraisal of Redox Melting in the Earth’s Mantle as a Function of Tectonic Setting and Time
Publisher: Oxford University Press (OUP)
Date: 03-11-2010
Paleo-Asian Oceanic slab under the North China Craton revealed by carbonatites derived from subducted limestones: REPLY
Publisher: Geological Society of America
Date: 11-04-2017
DOI: 10.1130/G39077Y.1
Terpenoid composition and chemotaxonomic aspects of Miocene amber from the Koroglu Mountains, Turkey
Publisher: Elsevier BV
Date: 2014
Evidence for Archean ocean crust with low high field strength element signature from diamondiferous eclogite xenoliths
Publisher: Elsevier BV
Date: 09-1999
An essential role for continental rifts and lithosphere in the deep carbon cycle
Publisher: Springer Science and Business Media LLC
Date: 13-11-2017
Kimberlite genesis from a common carbonate-rich primary melt modified by lithospheric mantle assimilation
Publisher: American Association for the Advancement of Science (AAAS)
Date: 24-04-2020
Abstract: Diamond-bearing kimberlites were born from similar melts in the deep Earth and variably modified during ascent.
Trace element partitioning in the granulite facies
Publisher: Springer Science and Business Media LLC
Date: 28-08-2009
Between carbonatite and lamproite—Diamondiferous Torngat ultramafic lamprophyres formed by carbonate-fluxed melting of cratonic MARID-type metasomes
Publisher: Elsevier BV
Date: 07-2008
Experimentally determined partitioning of high field strength- and selected transition elements between spinel and basaltic melt
Publisher: Elsevier BV
Date: 11-1994
Carbonated sediment recycling and its contribution to lithospheric refertilization under the northern North China Craton
Publisher: Elsevier BV
Date: 09-2017
A trace element perspective on Archean crust formation and on the presence or absence of Archean subduction
Publisher: Geological Society of America
Date: 2008
A – Goldschmidt Abstracts 2013
Publisher: Mineralogical Society
Date: 07-2013
Petrology of spinel lherzolite xenoliths from Youkou volcano, Adamawa Massif, Cameroon Volcanic Line: mineralogical and geochemical fingerprints of sub-rift mantle processes
Publisher: Springer Science and Business Media LLC
Date: 23-01-2018
Insights into the petrogenesis of the West Kimberley lamproites from trace elements in olivine
Publisher: Springer Science and Business Media LLC
Date: 03-07-2018
Dynamic Metasomatism Experiments Investigating the Interaction between Migrating Potassic Melt and Garnet Peridotite
Publisher: MDPI AG
Date: 18-10-2021
DOI: 10.3390/GEOSCIENCES11100432
Abstract: Dynamic metasomatism experiments were performed by reacting a l roite melt with garnet peridotite by drawing melt through the peridotite into a vitreous carbon melt trap, ensuring the flow of melt through the peridotite and facilitating analysis of the melt. Pressure (2–3 GPa) and temperature (1050–1125 °C) conditions were chosen where the l roite was molten but the peridotite was not. Phlogopite was formed and garnet and orthopyroxene reacted out, resulting in phlogopite wehrlite (2 GPa) and phlogopite harzburgite (3 GPa). Phlogopites in the peridotite have higher Mg/(Mg + Fe) and Cr2O3 and lower TiO2 than in the l roite due to buffering by peridotite minerals, with Cr2O3 from the elimination of garnet. Compositional trends in phlogopites in the peridotite are similar to those in natural garnet peridotite xenoliths in kimberlites. Changes in melt composition resulting from the reaction show decreased TiO2 and increased Cr2O3 and Mg/(Mg + Fe). The loss of phlogopite components during migration through the peridotite results in low K2O/Na2O and K/Al in melts, indicating that chemical characteristics of l roites are lost through reaction with peridotite so that emerging melts would be less extreme in composition. This indicates that l roites are unlikely to be derived from a source rich in peridotite, and more likely originate in a source dominated by phlogopite-rich hydrous pyroxenites. Phlogopites from an experiment in which l roite and peridotite were intimately mixed before the experiment did not produce the same phlogopite compositions, showing that care must be taken in the design of reaction experiments.
Melting of hydrous pyroxenites with alkali amphiboles in the continental mantle: 2. Trace element compositions of melts and minerals
Publisher: Elsevier BV
Date: 2024
Two-Stage Origin of K-Enrichment in Ultrapotassic Magmatism Simulated by Melting of Experimentally Metasomatized Mantle
Publisher: MDPI AG
Date: 31-12-2019
DOI: 10.3390/MIN10010041
Abstract: The generation of strongly potassic melts in the mantle requires the presence of phlogopite in the melting assemblage, while isotopic and trace element analyses of ultrapotassic rocks frequently indicate the involvement of subducted crustal lithologies in the source. However, phlogopite-free experiments that focus on melting of sedimentary rocks and subsequent hybridization with mantle rocks at pressures of 1–3 GPa have not successfully produced melts with K2O wt%–6 wt%, while ultrapotassic igneous rocks reach up to 12 wt% K2O. Accordingly, a two-stage process that enriches K2O and increases K/Na in intermediary assemblages in the source prior to ultrapotassic magmatism seems likely. Here, we simulate this two-stage formation of ultrapotassic magmas using an experimental approach that involves re-melting of parts of an experimental product in a second experiment. In the first stage, reaction experiments containing layered sediment and dunite produced a modally metasomatized reaction zone at the border of a depleted peridotite. For the second-stage experiment, the metasomatized dunite was separated from the residue of the sedimentary rock and transferred to a smaller capsule, and melts were produced with 8 wt%–8.5 wt% K2O and K/Na of 6–7. This is the first time that extremely K-enriched ultrapotassic melts have been generated experimentally from sediments at low pressure applicable to a post-collisional setting.
Recycled Carbonate‐Bearing Silicate Sediments in the Sources of Circum‐Mediterranean K‐Rich Lavas: Evidence From Mg‐Zn Isotopic Decoupling
Publisher: American Geophysical Union (AGU)
Date: 24-02-2023
DOI: 10.1029/2022JB025135
Abstract: The high flux of subaerial volcanic CO 2 emissions around the circum‐Mediterranean region requires the involvement of an unusually carbon‐rich reservoir, but the origin of which is still unclear. Here, we aim to resolve this problem by analyzing Mg and Zn isotopes for the widely distributed mafic potassic to ultrapotassic lavas in this region. These K‐rich lavas have lower δ 26 Mg but similar δ 66 Zn compared to mid‐ocean ridge basalts (MORB). No known magmatic processes can explain the isotopic data, which must therefore be characteristics of the mantle sources. Recycled carbonate sediments are capable of explaining the low δ 26 Mg, but they typically also have high δ 66 Zn. Thus, the low δ 26 Mg but unfractionated δ 66 Zn of these K‐rich lavas define “Mg‐Zn isotopic decoupling” which has not yet been observed for other types of mantle‐derived lavas. The carbonate‐bearing silicate sediments analyzed here possess low δ 26 Mg and MORB‐like δ 66 Zn, which can account for the Mg‐Zn isotopic decoupling. Therefore, the nature of recycled materials (carbonates vs. carbonate‐bearing silicate sediments) in the mantle can be distinguished by the coupling or decoupling of Mg and Zn isotopes of mantle‐derived magmas. The input flux of carbon from the sediments to the lithospheric mantle is estimated to be ∼8.1 Mt/yr, and ∼22.4 Mt/yr of CO 2 emissions are predicted, which fit well with the observed output flux of 20.1 ± 13.4 Mt/yr. Our results demonstrate that recycled crustal carbon stored in the lithospheric mantle is an important source for the extensive subaerial volcanic CO 2 emissions in the circum‐Mediterranean region.
In-cloud sulfate addition to single particles resolved with sulfur isotope analysis during HCCT-2010
Publisher: Copernicus GmbH
Date: 28-04-2014
Abstract: Abstract. In-cloud production of sulfate modifies aerosol size distribution, with important implications for the magnitude of indirect and direct aerosol cooling and the impact of SO2 emissions on the environment. We investigate which sulfate sources dominate the in-cloud addition of sulfate to different particle classes as an air parcel passes through an orographic cloud. Sulfate aerosol, SO2 and H2SO4 were collected upwind, in-cloud and downwind of an orographic cloud for three cloud measurement events during the Hill Cap Cloud Thuringia c aign in autumn 2010 (HCCT-2010). Combined SEM and NanoSIMS analysis of single particles allowed the δ34S of particulate sulfate to be resolved for particle size and type. The most important in-cloud SO2 oxidation pathway at HCCT-2010 was aqueous oxidation catalysed by transition metal ions (TMI catalysis), which was shown with single particle isotope analyses to occur primarily in cloud droplets nucleated on coarse mineral dust. In contrast, direct uptake of H2SO4 (g) and ultrafine particulate were the most important sources modifying fine mineral dust, increasing its hygroscopicity and facilitating activation. Sulfate addition to "mixed" particles (secondary organic and inorganic aerosol) and coated soot was dominated by in-cloud aqueous SO2 oxidation by H2O2 and direct uptake of H2SO4 (g) and ultrafine particle sulfate, depending on particle size mode and time of day. These results provide new insight into in-cloud sulfate production mechanisms, and show the importance of single particle measurements and models to accurately assess the environmental effects of cloud processing.
Emplacement features of lamprophyre and carbonatitic lamprophyre dykes at Aillik Bay, Labrador
Publisher: Cambridge University Press (CUP)
Date: 1989
DOI: 10.1017/S0016756800006129
Abstract: Alkaline and ultramafic l rophyre dykes at Aillik Bay on the coast of central Labrador exhibit features indicative of volatile-rich conditions at the time of emplacement. Aillikites (ultramafic l rophyres) are flanked by closely spaced fracture systems whose formation was promoted by a carbonate-rich fluid moving ahead of the intruding magma. Sannaites (alkaline l rophyres) frequently have horned termination structures which are interpreted to be partial reconnections between dyke segments which had separated at an earlier stage of intrusion. The l rophyre dykes comprise three sets which are interpreted as cone sheets and radial dykes related to an intrusive centre located beneath the Labrador Sea to the northeast of the coastal exposures. This complex is one of several on the margins of the Labrador Sea, and its position may be influenced by the Archean/Aphebian boundary and by a major oceanic structural feature represented by offsets in seafloor magnetic anomalies.
W – Goldschmidt Abstracts 2013
Publisher: Mineralogical Society
Date: 07-2013
Vein-plus-wall-rock melting mechanisms in the lithosphere and the origin of potassic alkaline magmas
Publisher: Elsevier BV
Date: 11-1992
Goldschmidt Abstracts 2007- T
Publisher: Elsevier BV
Date: 08-2007
Goldschmidt Abstracts 2010 – F
Publisher: Elsevier BV
Date: 06-2010
Rutile/melt partition coefficients for trace elements and an assessment of the influence of rutile on the trace element characteristics of subduction zone magmas
Publisher: Elsevier BV
Date: 03-2000
Goldschmidt Abstracts 2007- Q and R
Publisher: Elsevier BV
Date: 08-2007
Goldschmidt Abstracts 2007- P
Publisher: Elsevier BV
Date: 08-2007
Incipient carbonate melting drives precious metal and sulfur mobilisation in the mantle
Publisher: Research Square Platform LLC
Date: 28-02-2023
DOI: 10.21203/RS.3.RS-2610331/V1
Abstract: We present results from high-pressure, high-temperature experiments that generate incipient carbonate melts at mantle conditions (~90km depth and temperatures between 900 - 1050℃). We show that these melts can effectively sequester sulfur, in its oxidised form of sulfate, platinum group elements, and first-row transition metals from mantle lithologies of peridotite and pyroxenite. These primitive oxidised melts may be effective agents to dissolve, redistribute and concentrate sulfur as well as chalcophile metals within the mantle, and from the mantle to shallower regions within the Earth, where localised dynamic physio-chemical processes can lead to ore genesis at various crustal depths. It is proposed that these carbonate-sulfur rich melts may be more widespread than previously thought, and may play a first order role in the metallogenic enhancement of localised and predictable lithospheric domains.
Incipient carbonate melting drives metal and sulfur mobilization in the mantle
Publisher: Research Square Platform LLC
Date: 28-08-2023
DOI: 10.21203/RS.3.RS-2610331/V2
Abstract: We present results from high-pressure, high-temperature experiments that generate incipient carbonate melts at mantle conditions (~ 90 km depth and temperatures between 900–1050°C). We show that these primitive carbonate melts can sequester sulfur in its oxidized form of sulfate, as well as base and precious metals from mantle lithologies of peridotite and pyroxenite. It is proposed that these carbonate-sulfur-rich melts may be more widespread than previously thought, and that they may play a first order role in the metallogenic enhancement of localized lithospheric domains. They act as effective agents to dissolve, redistribute and concentrate metals within discrete domains of the mantle and into shallower regions within the Earth, where dynamic physico-chemical processes can lead to ore genesis at various crustal depths. Green metals could be transported and concentrated into ores by their interaction with low temperature carbonate rich melts.
Parallels in the origin of the geochemical signatures of island arc volcanics and continental potassic igneous rocks: The role of residual titanates
Publisher: Elsevier BV
Date: 07-1990
Theme 5: The deeper earth
Publisher: Elsevier BV
Date: 06-2004
Mineral and trace element composition of the Lokpanta oil shales in the Lower Benue Trough, Nigeria
Publisher: Elsevier BV
Date: 09-2011
Evidence for a Carbonatite-Influenced Source Assemblage for Intraplate Basalts from the Buckland Volcanic Province, Queensland, Australia
Publisher: MDPI AG
Date: 10-09-2019
DOI: 10.3390/MIN9090546
Abstract: Eastern Australia contains a widespread suite of primitive (MgO ≥ 7.5 wt.%) intraplate basaltic provinces, including those sited along the longest continental hotspot track on Earth (≈2000 km), the Cosgrove track. The Buckland volcanic province is the most southerly basaltic province on the Cosgrove track before a km stretch that contains only sparse leucitite volcanism. Buckland is also situated just northeast of the edge of thick cratonic lithosphere where it transitions to a thinner continental lithosphere ( km) to the east, which may influence the production of plume-derived melts. Here, analysis of minor and trace elements in olivines in alkali basalts and basanites from the Buckland Province are combined with whole-rock compositions to elucidate the mantle source assemblages, and to calibrate minor and trace element indicators in olivine for application to source mineralogy. Olivine xenocrysts show element concentration ranges typical for peridotites Mn and Al concentrations indicate that the ambient mantle is spinel, rather than garnet, peridotite. High modal pyroxene content is indicated by high Ni, Zn/Fe, and Fe/Mn in olivines, while high Ti/Sc is consistent with hibole in the source. Residual phlogopite in the source of the basanites is indicated by low K/Nb in whole rocks, while apatite contains high P2O5 and low Rb/Sr (≥0.015) and Sr/La (≥13). The basanite source assemblage probably contains apatite, phlogopite, olivine, clinopyroxene and orthopyroxene, whereas the alkali basalt source assemblage is probably hibole, olivine, orthopyroxene and clinopyroxene ± phlogopite ± apatite. Both source assemblages correspond broadly to olivine websterite, with the basanite source lying deeper than that for alkali basalt, explaining the occurrence of phlogopite in the source. This mineralogy, along with whole-rock Ti/Eu, Zr/Hf and P2O5/TiO2 values approaching those of natural carbonatites, provide evidence showing that the Buckland source consists of a peridotite that has interacted with a carbonate-rich melt whose origin may be in the deep lithosphere or asthenosphere beneath the craton. Similar enrichment processes are probably common throughout eastern Australia, controlling trace element characteristics in basaltic provinces. The topography of the underside of the lithosphere may play a significant role in determining mantle source assemblages by erting and concentrating melt flow, and thus influence the location of basaltic provinces.
An experimental study of olivine lamproite: First results from the diamond stability field
Publisher: Elsevier BV
Date: 1993
Petrological characterization of the source components of potassic magmas: geochemical and experimental constraints
Publisher: Elsevier BV
Date: 11-1992
The Palaeoanthropocene – The beginnings of anthropogenic environmental change
Publisher: Elsevier BV
Date: 11-2013
Sulfur isotope ratio measurements of individual sulfate particles by NanoSIMS
Publisher: Elsevier BV
Date: 04-2008
Molecular composition and chemotaxonomic aspects of Eocene amber from the Ameki Formation, Nigeria
Publisher: Elsevier BV
Date: 10-2012
The analcime problem and its impact on the geochemistry of ultrapotassic rocks from Serbia
Publisher: Mineralogical Society
Date: 08-2004
Abstract: Tertiary ultrapotassic volcanic rocks from Serbia occasionally display low levels of K 2 O and K 2 O/ Na 2 O. In these rocks, analcime regularly appears as pseudomorphs after pre-existing leucite microphenocrysts. The process ofleucite transformation in Serbian ultrapotassic rocks is very thorough: fresh leucite survives only in ugandites from the Koritnik lava flows as well as in rare inclusions in Cpx. This paper focuses on the impact of ‘analcimization’ on the mineralogy and geochemistry ofthe Serbian ultrapotassic rocks, using the s les where leucite survived as a monitor for the process. Analcimization has had a great impact on the geochemistry of the rocks, but affects only a restricted number of chemical parameters. These are the falsification of the original K 2 O/Na 2 O ratio, the decoupling oflarge-ion lithophile elements resulting in considerable depletion of Rb and K 2 O, but not ofBa, and sporadic, but extreme enrichment ofCs in some analcime-bearing s les (up to 900 ppm). Analcimization is also recognized by an increase in whole-rock δ 18 O values of ∼3% compared to fresh rocks, which correlates with the level of whole-rock hydration. Finally, the 87 Sr/ 86 Sr enrichment at nearly constant 143 Nd/ 144 Nd demonstrated by some rocks can also be explained by the analcimization ofleucite. For s les with variable 87 Sr/ 86 Sr from the same lava flow, 87 Sr/ 86 Sr values correlate with modal analcime abundance (ex-leucite), loss on ignition of whole-rock and whole-rock δ 18 O values. The extreme depletion in K and enrichment in Na, together with modification of other geochemical parameters, may have led to the misinterpretation of the origin and geodynamic affiliations of the Serbian ultrapotassic rocks, had the effects of analcimization not been taken into account.
Trace element compositions of minerals in garnet and spinel periodotite xenoliths from the Vitim volcanic field, Transbaikalia, eastern Siberia
Publisher: Elsevier
Date: 1999
Structural characterization of Nigerian coals by X-ray diffraction, Raman and FTIR spectroscopy
Publisher: Elsevier BV
Date: 12-2010
Goldschmidt Abstracts 2010 – J
Publisher: Elsevier BV
Date: 06-2010
Paleo-Asian oceanic slab under the North China craton revealed by carbonatites derived from subducted limestones
Publisher: Geological Society of America
Date: 20-10-2016
DOI: 10.1130/G38365.1
Goldschmidt Abstracts 2010 – R
Publisher: Elsevier BV
Date: 06-2010
Minor and trace elements in olivines as probes into early igneous and mantle melting processes
Publisher: Elsevier BV
Date: 02-2013
Trace element variations in olivine phenocrysts from Ugandan potassic rocks as clues to the chemical characteristics of parental magmas
Publisher: Springer Science and Business Media LLC
Date: 17-09-2011
Petrology of ultramafic lamprophyres from the Beaver Lake area of Eastern Antarctica and their relation to the breakup of Gondwanaland
Publisher: Springer Science and Business Media LLC
Date: 03-2002
Subducted Front of the Indian Continental Crust Beneath the Tibetan Plateau in the Early Eocene
Publisher: American Geophysical Union (AGU)
Date: 30-09-2022
DOI: 10.1029/2022EA002533
Abstract: The immense Tibetan Plateau is a masterpiece of the ongoing India–Asia collision. The timing of the collision is a critical parameter to reconstruct the plateau evolution, but has been not well understood yet. Here, we report a newly discovered Eocene (53.8 Ma) shoshonitic intrusion with the input of Indian continental material in the Yangbajing area of the Lhasa Terrane, south Tibet. The reverse 207 Pb/ 206 Pb zoning exhibited by feldspars, the linear isotopic arrays between whole‐rock 187 Os/ 188 Os and 1/ 188 Os, the in‐situ feldspar 208 Pb/ 204 Pb and 206 Pb/ 204 Pb values, and the in‐situ zircon ε Hf (t) values and δ 18 O values strongly demonstrate a binary interaction process for the generation of the Yangbajing shoshonitic intrusion. Our Os isotopes further illustrate that the interaction process was dominated by recycled crustal melt assimilating minor mantle melt. In addition, different isotopic systems consistently point to an end‐member represented by the underthrust crust slice of Indian continent, which indicates that the Indian lithosphere must have already subducted beneath the Lhasa Terrane at 53.8 Ma. This is also supported by the abrupt isotopic shift toward the enriched values and the composition variation toward the high potassium contents in the subsequent Tibetan magmatism, corresponding to an increasing involvement of the Indian continental crust into the upper plate magmatism. Therefore, the Yangbajing shoshonitic intrusion is one of the earliest known magmatic evidence for the onset of the India–Asia collision.
Genesis of Ultramafic Lamprophyres and Carbonatites at Aillik Bay, Labrador: a Consequence of Incipient Lithospheric Thinning beneath the North Atlantic Craton
Publisher: Oxford University Press (OUP)
Date: 14-03-2006
Goldschmidt Abstracts 2008- P
Publisher: Elsevier BV
Date: 07-2008
Eclogite xenoliths from the Kuruman kimberlites, South Africa: geochemical fingerprinting of deep subduction and cumulate processes☆
Publisher: Elsevier BV
Date: 07-2004
Role of metasomatism in the development of the East African Rift at the Northern Tanzanian Divergence: Insights from 3D magnetotelluric modelling.
Publisher: Authorea, Inc.
Date: 17-08-2023
DOI: 10.22541/ESSOAR.169230197.72316079/V1
Abstract: The Northern Tanzanian Divergence in the East Africa Rift is arguably the best place on Earth to study the controls on rifting of thick lithosphere. Here, where the East Africa Rift intersects the Tanzanian Craton and the Mozambique Belt, the relationships between volcanism, faulting, pre-existing structures and lithospheric thickness and composition can be observed. In this work, we carry out the first lithospheric-scale 3D magnetotelluric modelling of the Northern Tanzanian Divergence and combine the results with experimental electrical conductivity and petrology models to calculate mantle composition, which is also inferred in the craton from reanalysis of garnet xenocryst data. Our results show that metasomatic materials exist in the cratonic lithospheric mantle and the relatively undeveloped southern part of the rift zone. However, the lithospheric mantle of the Mozambique Belt and the more developed northern section of the rift is more resistive and does not contain metasomatic phases. Combined with geochemical data from erupted lavas, these results suggest that, in zones that have experienced voluminous Cenozoic magmatism, melting events have destroyed the metasomes and dehydrated the mantle. Since the presence of magma is a primary control of lithospheric strength, rifting may become limited as the lithospheric mantle becomes dehydrated and harder to melt.
Continent Formation in the Archean and Chemical Evolution of the Cratonic Lithosphere: Melt-Rock Reaction Experiments at 3-4 GPa and Petrogenesis of Archean Mg-Diorites (Sanukitoids)
Publisher: Oxford University Press (OUP)
Date: 20-05-2010
Enhanced Role of Transition Metal Ion Catalysis During In-Cloud Oxidation of SO2
Publisher: American Association for the Advancement of Science (AAAS)
Date: 09-05-2013
Origin of potassic postcollisional volcanic rocks in young, shallow, blueschist-rich lithosphere
Publisher: American Association for the Advancement of Science (AAAS)
Date: 16-07-2021
Abstract: Unusually high Th/La in K-rich orogenic rocks may indicate shallow blueschist-rich sources in accretionary settings.
Calcium isotope evidence for subduction-enriched lithospheric mantle under the northern North China Craton
Publisher: Elsevier BV
Date: 10-2018
Determination of partition coefficients for trace elements in high pressure-temperature experimental run products by laser ablation microprobe-inductively coupled plasma-mass spectrometry (LAM-ICP-MS)
Publisher: Elsevier BV
Date: 12-1993
Measurement of sulfur isotope ratios in micrometer-sized samples by NanoSIMS
Publisher: Elsevier BV
Date: 07-2006
Accretion of arc-oceanic lithospheric mantle in the Mediterranean: Evidence from extremely high-Mg olivines and Cr-rich spinel inclusions in lamproites
Publisher: Elsevier BV
Date: 15-04-2007
Patterns and origin of igneous activity around the Tanzanian craton
Publisher: Elsevier BV
Date: 2012
Mediterranean Tertiary lamproites derived from multiple source components in postcollisional geodynamics
Publisher: Elsevier BV
Date: 04-2008
Trace element partitioning in lamproitic magmas—the Gaussberg olivine leucitite
Publisher: Elsevier BV
Date: 07-2004
The Genesis of Continental Basic Alkaline Magmas-- An Interpretation in Terms of Redox Melting
Publisher: Oxford University Press (OUP)
Date: 1988
Magmatic modification and metasomatism of the subcontinental mantle beneath the Vitim volcanic field (East Siberia): evidence from trace element data on pyroxenite and peridotite xenoliths from Miocen
Publisher: Elsevier BV
Date: 10-2000
The contribution of ultramafic veins in alkaline and non-alkaline mafic magmatism
Publisher: Elsevier BV
Date: 08-2006
Laser-ablation ICP-MS analysis of siliceous rock glasses fused on an iridium strip heater using MgO dilution
Publisher: Springer Science and Business Media LLC
Date: 31-07-2007
Trace element partition coefficients for clinopyroxene and phlogopite in an alkaline lamprophyre from Newfoundland by LAM-ICP-MS
Publisher: Elsevier BV
Date: 02-1996
A review and assessment of experiments on Kimberlites, Lamproites and Lamprophyres as a guide to their Origin
Publisher: Springer Science and Business Media LLC
Date: 03-1990
DOI: 10.1007/BF02871896
Trace element abundances in rutiles from eclogites and associated garnet mica schists
Publisher: Elsevier BV
Date: 03-2002
High-pressure stability of the fluor- and hydroxy-endmembers of pargasite and K-richterite
Publisher: Elsevier BV
Date: 09-1991
First direct evidence of sedimentary carbonate recycling in subduction-related xenoliths
Publisher: Springer Science and Business Media LLC
Date: 23-06-2015
DOI: 10.1038/SREP11547
Abstract: Carbon in rocks and its rate of exchange with the exosphere is the least understood part of the carbon cycle. The amount of carbonate subducted as sediments and ocean crust is poorly known, but essential to mass balance the cycle. We describe carbonatite melt pockets in mantle peridotite xenoliths from Dalihu (northern China), which provide firsthand evidence for the recycling of carbonate sediments within the subduction system. These pockets retain the low trace element contents and δ 18 O SMOW = 21.1 ± 0.3 of argillaceous carbonate sediments, representing wholesale melting of carbonates instead of filtered recycling of carbon by redox freezing and melting. They also contain microscopic diamonds, partly transformed to graphite, indicating that depths km were reached, as well as a bizarre mixture of carbides and metal alloys indicative of extremely reducing conditions. Subducted carbonates form diapirs that move rapidly upwards through the mantle wedge, reacting with peridotite, assimilating silicate minerals and releasing CO 2 , thus promoting their rapid emplacement. The assimilation process produces very local disequilibrium and ergent redox conditions that result in carbides and metal alloys, which help to interpret other occurrences of rock exhumed from ultra-deep conditions.
Primary Melt Compositions in the Earth's Mantle
Publisher: Elsevier
Date: 2018
Tertiary Ultrapotassic Volcanism in Serbia: Constraints on Petrogenesis and Mantle Source Characteristics
Publisher: Oxford University Press (OUP)
Date: 18-03-2005
The Role of Blueschist Stored in Shallow Lithosphere in the Generation of Postcollisional Orogenic Magmas
Publisher: American Geophysical Union (AGU)
Date: 10-2020
DOI: 10.1029/2020JB019910
Anatectic amphibole and restitic garnet in Variscan migmatite from NE Sardinia, Italy: insights into partial melting from mineral trace elements
Publisher: Schweizerbart
Date: 03-07-2014
Potassic and ultrapotassic magmas and their origin
Publisher: Elsevier BV
Date: 11-1992
Massive carbon storage in convergent margins initiated by subduction of limestone
Publisher: Springer Science and Business Media LLC
Date: 22-07-2021
DOI: 10.1038/S41467-021-24750-0
Abstract: Remobilization of sedimentary carbonate in subduction zones modulates arc volcanism emissions and thus Earth’s climate over geological timescales. Although limestones (or chalk) are thought to be the major carbon reservoir subducted to subarc depths, their fate is still unclear. Here we present high-pressure reaction experiments between impure limestone (7.4 wt.% clay) and dunite at 1.3–2.7 GPa to constrain the melting behaviour of subducted natural limestone in contact with peridotite. The results show that although clay impurities significantly depress the solidus of limestone, melting will not occur whilst limestones are still part of the subducting slab. Buoyancy calculations suggest that most of these limestones would form solid-state diapirs intruding into the mantle wedge, resulting in limited carbon flux to the deep mantle ( ~10 Mt C y −1 ). Less than 20% melting within the mantle wedge indicates that most limestones remain stable and are stored in subarc lithosphere, resulting in massive carbon storage in convergent margins considering their high carbon flux (~21.4 Mt C y −1 ). Assimilation and outgassing of these carbonates during arc magma ascent may dominate the carbon flux in volcanic arcs.
Melting and dynamic metasomatism of mixed harzburgite + glimmerite mantle source: Implications for the genesis of orogenic potassic magmas
Publisher: Elsevier BV
Date: 04-2017
Ugandan kamafugites: Re-melting of a variable enriched veined subcontinental lithospheric mantle
Publisher: Elsevier BV
Date: 08-2006
Trace element compositions of minerals in garnet and spinel peridotite xenoliths from the Vitim volcanic field, Transbaikalia, eastern Siberia
Publisher: Elsevier BV
Date: 09-1999
Contrasting types of metasomatism in dunite, wehrlite and websterite xenoliths from Kimberley, South Africa
Publisher: Elsevier BV
Date: 12-2008
Integrating Ultramafic Lamprophyres into the IUGS Classification of Igneous Rocks: Rationale and Implications
Publisher: Oxford University Press (OUP)
Date: 29-04-2005
Coupled silicon–oxygen isotope fractionation traces Archaean silicification
Publisher: Elsevier BV
Date: 2011
Quantitative Estimation of Major and Trace Elements in Coals of the Benue Trough, Nigeria
Publisher: Informa UK Limited
Date: 15-04-2013
Craton reactivation on the Labrador Sea margins: 40Ar/39Ar age and Sr–Nd–Hf–Pb isotope constraints from alkaline and carbonatite intrusives
Publisher: Elsevier BV
Date: 04-2007
Origin of carbonate melts in orogenic belts by anatexis of downthrust carbonate sediments
Publisher: Elsevier BV
Date: 10-2023
Growth of early continental crust controlled by melting of amphibolite in subduction zones
Publisher: Springer Science and Business Media LLC
Date: 06-2002
DOI: 10.1038/NATURE00799
Improved oxygen buffering techniques for C-O-H fluid saturated experiments at high pressure-temperature
Publisher: Elsevier BV
Date: 08-1988
Constraints on the sources of post-collisional K-rich magmatism: The roles of continental clastic sediments and terrigenous blueschists
Publisher: Elsevier BV
Date: 04-2017
High U/Th partitioning by clinopyroxene from alkali silicate and carbonatite metasomatism: an origin for Th/U disequilibrium in mantle melts?
Publisher: Wiley
Date: 04-2001
Rejuvenation and erosion of the cratonic lithosphere
Publisher: Springer Science and Business Media LLC
Date: 27-07-2008
DOI: 10.1038/NGEO261
A review of petrogenesis of Mediterranean Tertiary lamproites: A perspective from the Serbian ultrapotassic province
Publisher: Geological Society of America
Date: 2007
Potassium-rich magmatism from a phlogopite-free source
Publisher: Geological Society of America
Date: 15-03-2017
DOI: 10.1130/G38691.1
Displaced cratonic mantle concentrates deep carbon during continental rifting
Publisher: Springer Science and Business Media LLC
Date: 03-06-2020
Mantle rocks in East Antarctica
Publisher: Geological Society of London
Date: 03-06-2021
DOI: 10.1144/M56-2020-8
Abstract: Only three localities of mantle xenoliths are known from all of East Antarctica, occurring at the Jetty Peninsula (Lambert–Amery Rift), Vestfold Hills and Gaussberg volcano. The latter two are spinel-facies peridotites, whereas the Jetty Peninsula rocks also include garnet-spinel lherzolites all come from Indo-Antarctica. The mantle xenoliths of Jetty Peninsula and Vestfold Hills contain abundant geochemical and mineralogical evidence for multiple enrichment events that are attributed to infiltration of melts and their fluid products. Many of these episodes are spatially related to precursory activity along major trans-lithospheric structures that eventually led to the separation of India from Antarctica. Mantle rocks also occur at Schirmacher Oasis (Dronning Maud Land) and Haskard Highlands (Shackleton Ranges) as blocks tectonically emplaced in high-grade crustal rocks. These show varying degrees of alteration due to reaction with silicic crustal rocks or hydrous fluids: none correspond to unchanged mantle compositions. Geophysical surveys are our only information on the mantle lithosphere beneath the inland ice, and these can be used to infer the locations of thicker lithosphere probably related to cratons by southward extrapolation of coastal geological correlations. Intense local modification of the mantle lithosphere by melt infiltration and fluid movements may influence the large-scale images derived from geophysical data, and may be incorrectly interpreted as homogeneous compositions.
Sulfur isotope fractionation during oxidation of sulfur dioxide: gas-phase oxidation by OH radicals and aqueous oxidation by H<sub>2</sub>O<sub>2</sub&
Publisher: Copernicus GmbH
Date: 06-01-2012
Abstract: Abstract. The oxidation of SO2 to sulfate is a key reaction in determining the role of sulfate in the environment through its effect on aerosol size distribution and composition. Sulfur isotope analysis has been used to investigate sources and chemical processes of sulfur dioxide and sulfate in the atmosphere, however interpretation of measured sulfur isotope ratios is challenging due to a lack of reliable information on the isotopic fractionation involved in major transformation pathways. This paper presents laboratory measurements of the fractionation factors for the major atmospheric oxidation reactions for SO2: Gas-phase oxidation by OH radicals, and aqueous oxidation by H2O2, O3 and a radical chain reaction initiated by iron. The measured fractionation factor for 34S/32S during the gas-phase reaction is αOH = (1.0089±0.0007)−((4±5)×10−5) T(°C). The measured fractionation factor for 34S/32S during aqueous oxidation by H2O2 or O3 is αaq = (1.0167±0.0019)−((8.7±3.5) ×10−5)T(°C). The observed fractionation during oxidation by H2O2 and O3 appeared to be controlled primarily by protonation and acid-base equilibria of S(IV) in solution, which is the reason that there is no significant difference between the fractionation produced by the two oxidants within the experimental error. The isotopic fractionation factor from a radical chain reaction in solution catalysed by iron is αFe = (0.9894±0.0043) at 19 °C for 34S/32S. Fractionation was mass-dependent with regards to 33S/32S for all the reactions investigated. The radical chain reaction mechanism was the only measured reaction that had a faster rate for the light isotopes. The results presented in this study will be particularly useful to determine the importance of the transition metal-catalysed oxidation pathway compared to other oxidation pathways, but other main oxidation pathways can not be distinguished based on stable sulfur isotope measurements alone.
Torngat ultramafic lamprophyres and their relation to the North Atlantic Alkaline Province
Publisher: Elsevier BV
Date: 09-2004
Evidence from Antarctic mantle peridotite xenoliths for changes in mineralogy, geochemistry and geothermal gradients beneath a developing rift
Publisher: Elsevier BV
Date: 06-2006
Phosphorus Variations in Volcanic Sequences Reveal the Linkage Between Regional Tectonics and Terrestrial Biota Evolution
Publisher: American Geophysical Union (AGU)
Date: 08-2022
DOI: 10.1029/2022GC010536
Abstract: The Middle‒Late Mesozoic massive volcanism formed a considerable thickness of volcanic‐sedimentary strata in western Liaoning, northern China. Concomitantly, it elevated phosphorus (P) availability for the rapid bloom of the terrestrial Yanliao and Jehol biotas, which developed highly abundant bio ersity and biomass. Hence, systematic tectonic and geochemical analyses of these volcanic‐sedimentary sequences with a significant P fluctuation would advance our understanding of the coevolutionary relationship between terrestrial biotas and regional tectonics. Here, we show that the secular variation of P availability in the Mesozoic volcanic rocks were the immediate results of the changes in volcanic intensity and lithospheric thickness controlled by the geological background of the cratonic destruction resulting from the paleo‐Pacific plate subduction. This study reveals the constraint effect of regional tectonics on the evolution of terrestrial ecosystems through the volcanism and P cycle.
Petrological characterization of the mantle source of Mediterranean lamproites: Indications from major and trace elements of phlogopite
Publisher: Elsevier BV
Date: 08-2013
Metamorphism and melting of picritic crust in the early Earth
Publisher: Elsevier BV
Date: 02-2014
Evidence for Archean ocean crust with low high field strength element signature from diamondiferous eclogite xenoliths
Publisher: Elsevier
Date: 1999
Experimentally determined trace and minor element partitioning between clinopyroxene and carbonatite melt under upper mantle conditions
Publisher: Elsevier BV
Date: 07-1995
Non-explosive, dome-forming eruptions at Mt. Taranaki, New Zealand
Publisher: Elsevier BV
Date: 2012
The Geochemical Complexity of Kimberlite Rocks and their Olivine Populations: a Comment on Cordieret al.(Journal of Petrology, 56, 1775–1796, 2015)
Publisher: Oxford University Press (OUP)
Date: 05-2016
The effect of crystal orientation on the wetting behaviour of silicate melts on the surfaces of spinel peridotite minerals
Publisher: Springer Science and Business Media LLC
Date: 22-03-2002
Lamproites as indicators of accretion and/or shallow subduction in the assembly of south-western Anatolia, Turkey
Publisher: Wiley
Date: 15-08-2010
Encyclopedia of Marine Geosciences
Publisher: Springer Netherlands
Date: 2016
Hf isotope compositions of Mediterranean lamproites: Mixing of melts from asthenosphere and crustally contaminated mantle lithosphere
Publisher: Elsevier BV
Date: 10-2010
Re-enrichment of cratonic lithospheric mantle beneath an evolving rift: Mantle xenoliths from East Antarctica
Publisher: Elsevier BV
Date: 08-2006
A mantle-source solution to the enigma of bimodal arc volcanism
Publisher: Research Square Platform LLC
Date: 03-11-2021
DOI: 10.21203/RS.3.RS-1029408/V1
Abstract: Silicate melts in arc environments are dominated by mafic (low-silica) and silicic (high-silica) compositions, often generating a characteristic bimodal pattern. We investigate the whole arc crust and show that the plutonic lower crust shares the bimodal pattern of melts from volcanoes. This key observation reveals that, contrary to some explanations of bimodal volcanism, variation in mantle source and mantle processes must fundamentally control bimodalism. We also recognise bimodalism in Th/La composition of the whole arc crust and suggest a new working hypothesis: bimodalism originates by melting of distinct sub-arc mantle sources, one dominated by relatively dry peridotite and the other by hydrous pyroxenite. The two groups of primary melts fractionate along distinct liquid lines of descent that lead to relatively dry mafic melts (Th/La~0.1) versus hydrous silicic melts (Th/La .2) by 65–80% fractional crystallisation. Common crustal processes such as crystal fractionation, assimilation, reactive flow and/or magma mixing may also lead to differentiation of both groups.
Petrogenesis of strongly alkaline primitive volcanic rocks at the propagating tip of the western branch of the East African Rift
Publisher: Elsevier BV
Date: 06-2009
δ30Si and δ29Si Determinations on USGS BHVO-1 and BHVO-2 Reference Materials with a New Configuration on a Nu Plasma Multi-Collector ICP-MS
Publisher: Wiley
Date: 06-2008
Early continental crust generated by reworking of basalts variably silicified by seawater
Publisher: Springer Science and Business Media LLC
Date: 26-08-2019
Melting of hydrous pyroxenites with alkali amphiboles in the continental mantle: 1. Melting relations and major element compositions of melts
Publisher: Elsevier BV
Date: 07-2022
Characterisation of chromites, chromite hosted inclusions of silicates and metal alloys in chromitites from the Indo-Myanmar ophiolite belt of Northeastern India
Publisher: Elsevier BV
Date: 11-2017
Xenoliths from the sub-volcanic lithosphere of Mt Taranaki, New Zealand
Publisher: Elsevier BV
Date: 02-2010
Hybridization Melting Between Continent‐Derived Sediment and Depleted Peridotite in Subduction Zones
Publisher: American Geophysical Union (AGU)
Date: 05-2018
DOI: 10.1029/2018JB015507
The olivine macrocryst problem: New insights from minor and trace element compositions of olivine from Lac de Gras kimberlites, Canada
Publisher: Elsevier BV
Date: 04-2015
Trace elements in olivine of ultramafic lamprophyres controlled by phlogopite-rich mineral assemblages in the mantle source
Publisher: Elsevier BV
Date: 11-2017
Trace element and Nd–Sr isotopic composition of ultramafic lamprophyres from the East Antarctic Beaver Lake area
Publisher: Elsevier BV
Date: 06-2001
Partial melting in Archean subduction zones: constraints from experimentally determined trace element partition coefficients between eclogitic minerals and tonalitic melts under upper mantle condition
Publisher: Elsevier BV
Date: 2002
Continuous cratonic crust between the Congo and Tanzania blocks in western Uganda
Publisher: Springer Science and Business Media LLC
Date: 02-06-2010
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