ORCID Profile
0000-0003-0192-2384
Current Organisation
Macquarie University
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Geology | Mineralogy and Crystallography | Geochemistry | Igneous and Metamorphic Petrology | Isotope Geochemistry | Geochemistry not elsewhere classified | Synchrotrons; Accelerators; Instruments and Techniques | Structural Chemistry and Spectroscopy | Inorganic Geochemistry | Igneous And Metamorphic Petrology | Geochronology | Petrophysics | Extraterrestrial Geology | Other Physical Sciences | Planetary Science (excl. Extraterrestrial Geology) | Geochemistry Not Elsewhere Classified | Tectonics
Expanding Knowledge in the Earth Sciences | Emerging Defence Technologies | Mineral Exploration not elsewhere classified | Earth sciences | Expanding Knowledge in Technology | Mineral Resources (excl. Energy Resources) not elsewhere classified | Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in the Physical Sciences | Integrated Systems |
Publisher: Informa UK Limited
Date: 11-2006
Publisher: Geological Society of America
Date: 04-2012
DOI: 10.1130/G32623.1
Publisher: Cambridge University Press (CUP)
Date: 20-07-2020
DOI: 10.1017/S0016756820000667
Abstract: Six acidic dykes were discovered surrounding the Laiziling pluton, Xianghualing area, in the western Cathaysia Block, South China. A number of captured zircons are found in two of these acidic dykes. By detailed U–Pb dating, Lu–Hf isotopes and trace-element analysis, we find that these zircons have ages clustered at c. 2.5 Ga. Two acidic dyke s les yielded upper intersection point 206 U/ 238 Pb ages of 2505 ± 42 Ma and 2533 ± 22 Ma, and weighted mean 207 Pb/ 206 Pb ages of 2500 ± 30 Ma and 2535 ± 16 Ma. The majority of these zircons have high (Sm/La) N , Th/U and low Ce/Ce* ratios, indicating a magmatic origin, but some grains were altered by later hydrothermal fluid. Additionally, the magmatic zircons have high Y, U, heavy rare earth element, Nb and Ta contents, indicating that their host rocks were mainly mafic rocks or trondhjemite–tonalite–granodiorite rock series. Equally, their moderate Y, Yb, Th, Gd and Er contents also indicate that a mafic source formed in a continental volcanic-arc environment. These zircons have positive ϵ Hf ( t ) values (2.5–6.9) close to zircons from the depleted mantle, with T DM (2565–2741 Ma) and T DM2 (2608–2864 Ma) ages close to their formation ages, indicating that these zircons originated directly from depleted mantle magma, or juvenile crust derived from the depleted mantle in a very short period. We therefore infer that the Cathaysia Block experienced a crustal growth event at c. 2.5 Ga.
Publisher: Wiley
Date: 06-2002
Publisher: Geological Society of America
Date: 1996
Publisher: Elsevier BV
Date: 12-2001
Publisher: Springer Science and Business Media LLC
Date: 29-08-2014
Publisher: Elsevier BV
Date: 02-2016
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 10-2020
Publisher: Oxford University Press (OUP)
Date: 29-05-2011
Publisher: Elsevier BV
Date: 09-2021
Publisher: Cambridge University Press (CUP)
Date: 1996
DOI: 10.1017/S0263593300006490
Abstract: The rheological and chemical behaviour of the lower crust during anatexis has been a major focus of geological investigations for many years. Modern studies of crustal evolution require significant knowledge, not only of the potential source regions for granites, but also of the transport paths and emplacement mechanisms operating during granite genesis. We have gained significant insights into the segregation and transport of granitoid melts from the results of experimental studies on rock behaviour during partial melting. Experiments performed on crustal rock cores under both hydrostatic conditions and during deformation have led, in part, to two conclusions. (1) The interfacial energy controlling melt distribution is anisotropic and, as a result, the textures deviate significantly from those predicted for ideal systems—planar solid-melt interfaces are developed in addition to triple junction melt pockets. The ideal dihedral angle model for melt distribution cannot be used as a constraint to predict melt migration in the lower crust. (2) The ‘critical melt fraction’ model, which requires viscous, granitic melt to remain in the source until melt fractions reach vol%, is not a reliable model for melt segregation. The most recent experimental results on crustal rock cores which have helped advance our understanding of melt segregation processes have shown that melt segregation is controlled by several variables, including the depth of melting, the type of reaction and the volume change associated with that reaction. Larger scale processes such as tectonic environment determine the rate at which the lower crust heats and deforms, thus the tectonic setting controls the melt fraction at which segregation takes place, in addition to the pressure and temperature of the potential melting reactions. Melt migration therefore can occur at a variety of different melt fractions depending on the tectonic environment these results have significant implications for the predicted geochemistry of the magmas themselves.
Publisher: American Geophysical Union (AGU)
Date: 06-2008
DOI: 10.1029/2007GC001933
Publisher: Oxford University Press (OUP)
Date: 22-02-2012
Publisher: Wiley
Date: 19-11-2010
Publisher: AIP
Date: 2013
DOI: 10.1063/1.4812040
Publisher: The Royal Society
Date: 10-2018
Abstract: The development of plate tectonics from a pre-plate tectonics regime requires both the initiation of subduction and the development of nascent subduction zones into long-lived contiguous features. Subduction itself has been shown to be sensitive to system parameters such as thermal state and the specific rheology. While generally it has been shown that cold-interior high-Rayleigh-number convection (such as on the Earth today) favours plates and subduction, due to the ability of the interior stresses to couple with the lid, a given system may or may not have plate tectonics depending on its initial conditions. This has led to the idea that there is a strong history dependence to tectonic evolution—and the details of tectonic transitions, including whether they even occur, may depend on the early history of a planet. However, intrinsic convective stresses are not the only dynamic drivers of early planetary evolution. Early planetary geological evolution is dominated by volcanic processes and impacting. These have rarely been considered in thermal evolution models. Recent models exploring the details of plate tectonic initiation have explored the effect of strong thermal plumes or large impacts on surface tectonism, and found that these ‘primary drivers’ can initiate subduction, and, in some cases, over-ride the initial state of the planet. The corollary of this, of course, is that, in the absence of such ongoing drivers, existing or incipient subduction systems under early Earth conditions might fail. The only detailed planetary record we have of this development comes from Earth, and is restricted by the limited geological record of its earliest history. Many recent estimates have suggested an origin of plate tectonics at approximately 3.0 Ga, inferring a monotonically increasing transition from pre-plates, through subduction initiation, to continuous subduction and a modern plate tectonic regime around that time. However, both numerical modelling and the geological record itself suggest a strong nonlinearity in the dynamics of the transition, and it has been noted that the early history of Archaean greenstone belts and trondhjemite–tonalite–granodiorite record many instances of failed subduction. Here, we explore the history of subduction failure on the early Earth, and couple these with insights from numerical models of the geodynamic regime at the time. This article is part of a discussion meeting issue ‘Earth dynamics and the development of plate tectonics'.
Publisher: Springer Science and Business Media LLC
Date: 03-1991
DOI: 10.1007/BF00311184
Publisher: Elsevier BV
Date: 11-2021
Publisher: Mineralogical Society
Date: 07-2013
Publisher: Geological Society of America
Date: 2008
Publisher: AIP Publishing
Date: 11-2020
DOI: 10.1063/5.0022849
Abstract: The Macquarie University Deformation-DIA (MQ D-DIA) multi-anvil apparatus at the Australian Synchrotron provides a new experimental facility that enables simultaneous high-pressure and high-temperature in situ synchrotron experimentation in Australia. The MQ D-DIA can be easily deployed at any of a number of beamlines at the Australian Synchrotron, and we describe its installation at the x-ray absorption spectroscopy beamline, which enables in situ x-ray absorption near-edge spectroscopy and energy-scanning x-ray diffraction. A simple, reliable, and x-ray transparent high-pressure cell assembly has been developed for the D-DIA for which load ressure and heater power/temperature relationships have been calibrated using in situ x-ray diffraction and “offline” mineral equilibration experiments. Additionally, we have mapped temperature distribution within the assembly using a new quantitative electron microprobe mapping technique developed for fine-grained polyphase s les. We are now investigating the speciation of geologically important trace elements in silicate melts (e.g., Zr, U, and Th) measured in situ under high pressure and temperature conditions corresponding to the Earth’s mantle. Pressure-dependent changes in speciation influence partitioning behavior, and therefore the distribution in the Earth, of many trace elements. However, previous ex situ investigations are h ered by uncertainty as to whether high-pressure speciation can be faithfully recorded in s les recovered to ambient conditions. We present preliminary results showing an increase in the coordination number of Zr dissolved as a trace component of a sodium-rich silicate melt with pressure. These results also indicate that silicate melt composition exerts a strong influence on Zr speciation.
Publisher: Elsevier BV
Date: 1994
Publisher: Cambridge University Press (CUP)
Date: 03-2009
DOI: 10.1017/S1755691009016181
Abstract: Many continental flood basalt provinces contain rhyolites with ‘A-type’ compositions and many studies have concluded that these higher silica rocks are crustal melts from metapelitic or tonalitic country rock. However, although many of the low-Ti continental flood basalt sequences exhibit a marked a silica gap from ∼55–65 wt. SiO 2 , many incompatible element ratios, and the calculated eruption temperatures (950–1100°C) are strikingly similar between the rhyolites and associated basalts. Using experimental evidence, derivation of the low-Ti rhyolites from a basaltic parent is shown to be a viable alternative to local crustal melting. Comparison of liquid compositions from experimental melting of both crustal and mantle-derived (basaltic) source materials allows the two to be distinguished on the basis of Al 2 O 3 and FeO content. The basalt experiments are reversible, such that the same melts can be produced by melting or crystallisation. The effect of increased water content in the source is also detectable in the liquid composition. The majority of rhyolites from continental flood basalt provinces fall along the experimental trend for basalt melting/ crystallisation at relatively low water content. The onset of the silica gap in the rhyolites is accompanied by an abrupt decrease in TiO 2 and FeO*, marking the start of Fe–Ti oxide crystallisation. Differentiation from 55–65 wt. SiO 2 requires ∼30 fractional crystallisation in which magnetite is an important phase, sometimes accompanied by limited crustal contamination. The rapid increase in silica occurs over a small temperature interval and for relatively small changes in the amount of fractional crystallisation, thus intermediate compositions are less likely to be s led. It is argued that the presence of a silica gap is not diagnostic of a crustal melting origin for either A-type granites or rhyolites in continental flood basalt provinces. The volume of these rhyolites erupted over the Phanerozoic is significant and models for crustal growth should take this substantial contribution from the mantle into account.
Publisher: Wiley
Date: 03-08-2005
Publisher: Oxford University Press (OUP)
Date: 05-12-2013
Publisher: Elsevier BV
Date: 11-2005
Publisher: Elsevier BV
Date: 08-2015
Publisher: American Geophysical Union (AGU)
Date: 10-08-1995
DOI: 10.1029/95JB00077
Publisher: Geological Society of America
Date: 2010
Publisher: American Geophysical Union (AGU)
Date: 03-2011
DOI: 10.1029/2010GC003413
Publisher: Elsevier BV
Date: 11-2016
Publisher: Informa UK Limited
Date: 17-02-2015
Publisher: Wiley
Date: 09-10-2018
DOI: 10.1111/IAR.12276
Publisher: Elsevier BV
Date: 10-2016
Publisher: University of Chicago Press
Date: 09-2004
DOI: 10.1086/422670
Publisher: Springer Science and Business Media LLC
Date: 08-04-2011
Publisher: Elsevier BV
Date: 2020
Publisher: Geological Society of America
Date: 06-01-2014
DOI: 10.1130/G34886.1
Publisher: Elsevier BV
Date: 11-2019
Publisher: Mineralogical Society of America
Date: 05-2015
DOI: 10.2138/AM-2015-5205
Publisher: American Geophysical Union (AGU)
Date: 06-2014
DOI: 10.1002/2013GC005199
Publisher: Wiley
Date: 06-2021
DOI: 10.1111/MAPS.13698
Abstract: We analyzed the highly siderophile element (HSE) contents and bulk Ge isotopic compositions of large metal grains in the CB chondrites Bencubbin (CB a ), Gujba (CB a ), and HaH 237 (CB b ). Our results suggest that the large grains were formed by the aggregation of smaller condensed grains, and the two Benccubinite groups are distinguishable based on their bulk metal δ 74/70 Ge mass‐dependent isotopic values of 0.99 ± 0.30‰ (CB a ) and −0.65 ± 0.10‰ (CB b ). Based on our observations of these three s les, the isotopic compositions of metal in CB a chondrites are best explained by condensation at slow cooling rates in the center of an impact plume, whereas the metal in CB b chondrites formed under fast cooling rates along the plume edges. We also analyzed the Ge contents and isotopic compositions of the core, intermediate, and rim fractions of two Gujba metal grains, which were separated by sequential digestion. These results show a gradual decrease in δ 74/70 Ge and [Ge] from core to rim. We suggest that these δ 74 Ge zonations result from near‐equilibrium condensation and evaporation processes in a heterogeneous plume. We propose a model for their formation in which (1) small grains (to become grain cores) condensed at equilibrium (2) these grains were transported to a warmer region of the plume where they reached temperatures lower than that of Fe‐Ni condensation, but high enough for the rapid evaporation of Ge (3) Ge evaporation followed by slow cooling enriched the grains in heavy Ge isotopes and the surrounding gas in light Ge isotopes and (4) equilibrium recondensation of metal from the gas and around the small grains formed the light Ge isotopic zonations observed in grain rims.
Publisher: American Geophysical Union
Date: 2007
DOI: 10.1029/174GM18
Publisher: Oxford University Press (OUP)
Date: 15-09-2009
Publisher: American Geophysical Union (AGU)
Date: 12-2019
DOI: 10.1029/2019JB018392
Abstract: Adakite‐like potassic rocks are widespread in postcollisional settings where they provide potential insights into deep crustal processes that include partial melting, lower crustal flow and thickening, plateau uplift, and the creation of porphyry metal deposits. Although substantial progress has been made in characterizing the geochemical and geophysical features of postcollisional adakite‐like potassic rocks, their petrogenesis remains controversial. Here we report direct experimental evidence for the origins of these rocks with partial melting experiments on (1) garnet hibolite and (2) the same garnet hibolite mixed with 20 wt. % of a primitive Tibetan shoshonite. The experiments were conducted at 1.5–2.0 GPa and 800–1,000 °C. The partial melts of garnet hibolite have typical adakitic signatures and are calc‐alkalic but lack the enrichment in potassium and other strongly incompatible elements (Rb, Ba, Th, U) that are characteristic of Tibetan adakite‐like rocks. In contrast, all characteristic features of the natural adakite‐like rocks are convincingly reproduced by the hybrid experiments. This includes negative inflections for Nb, Ta, and Ti on mantle‐normalized plots which are inherited from source materials rather than the effects of rutile in melting residues. The input of mantle‐derived shoshonitic mafic melts to a crustal source can be argued to provide not only the high concentrations of incompatible elements characteristic of adakite‐like potassic magmas but also the heat necessary for crustal melting. Our experimental results demonstrate that, in the case of the Tibetan Plateau at least, the production of adakite‐like potassic rocks in postcollisional settings can be best explained by such a model.
Start Date: 05-2012
End Date: 12-2013
Amount: $155,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2011
End Date: 10-2014
Amount: $250,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 10-2010
End Date: 12-2012
Amount: $700,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2016
End Date: 12-2020
Amount: $348,962.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2017
End Date: 06-2019
Amount: $780,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2012
End Date: 12-2015
Amount: $30,000,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2009
End Date: 06-2012
Amount: $185,000.00
Funder: Australian Research Council
View Funded Activity