ORCID Profile
0000-0001-9115-9196
Current Organisation
University of South Australia
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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.
Geochemistry | Igneous and Metamorphic Petrology | Isotope Geochemistry | Geology | Exploration Geochemistry | Marine and Estuarine Ecology (incl. Marine Ichthyology) | Proteomics and Intermolecular Interactions (excl. Medical Proteomics) | Quaternary Environments | Environmental Chemistry (incl. Atmospheric Chemistry) | Environmental Monitoring | Chemical Oceanography | Tectonics
Mineral Exploration not elsewhere classified | Expanding Knowledge in the Earth Sciences | Physical and Chemical Conditions of Water in Fresh, Ground and Surface Water Environments (excl. Urban and Industrial Use) | Copper Ore Exploration | Ecosystem Assessment and Management of Coastal and Estuarine Environments | Effects of Climate Change and Variability on Australia (excl. Social Impacts) | Precious (Noble) Metal Ore Exploration | Cancer and Related Disorders | Marine Flora, Fauna and Biodiversity |
Publisher: American Geophysical Union (AGU)
Date: 12-2021
DOI: 10.1029/2021GC010154
Abstract: We present PetroChron Antarctica, a new relational database including petrological, geochemical and geochronological data sets along with computed rock properties from geological s les across Antarctica. The database contains whole‐rock geochemistry with major/trace element and isotope analyses, geochronology from multiple isotopic systems and minerals for given s les, as well as an internally consistent rock classification based on chemical analysis and derived rock properties (i.e., chemical indices, density, p ‐velocity, and heat production). A broad range of meta‐information such as geographic location, petrology, mineralogy, age statistics and significance are also included and can be used to filter and assess the quality of the data. Currently, the database contains 11,559 entries representing 10,056 unique s les with varying amounts of geochemical and geochronological data. The distribution of rock types is dominated by mafic (36%) and felsic (33%) compositions, followed by intermediate (22%) and ultramafic (9%) compositions. Maps of age distribution and isotopic composition highlight major episodes of tectonic and thermal activity that define well known crustal heterogeneities across the continent, with the oldest rocks preserved in East Antarctica and more juvenile lithosphere characterizing West Antarctica. PetroChron Antarctica allows spatial and temporal variations in geology to be explored at the continental scale and integrated with other Earth‐cryosphere‐biosphere‐ocean data sets. As such, it provides a powerful resource ready for erse applications including plate tectonic reconstructions, geological/geophysical maps, geothermal heat flow models, lithospheric and glacial isostasy, geomorphology, ice sheet reconstructions, bio ersity evolution, and oceanography.
Publisher: Geological Society of London
Date: 28-03-2019
DOI: 10.1144/JGS2018-146
Publisher: Elsevier BV
Date: 04-2019
Publisher: Elsevier BV
Date: 09-2021
Publisher: Copernicus GmbH
Date: 23-03-2020
DOI: 10.5194/EGUSPHERE-EGU2020-9555
Abstract: & & The physical and mechanical processes rooted in the hydrated, serpentinized mantle above subduction zones (the & #8220 cold nose& #8221 ) remain debated and poorly understood, despite fundamental consequences on the elastic loading of the seismogenic interface. The fluids crossing this interface are expected to generate nests of seismicity and at the same time weaken the interface hanging wall through serpentinization and metasomatic processes. Ultramafic and jadeitite s les from two natural laboratories where such fossil settings are now visible at the Earth& #8217 s surface are used here to document multi-scale deformation mechanisms and fluid-rock interaction processes. Field relationships enable tracking the pathways followed by the fluids during HP metamorphism. Petrographic, geochemical, geochronological and microstructural observations demonstrate the complex interplay between brittle and plastic deformation processes throughout the gradual hydration of the cold nose mantle over millions of years. Changes in bulk rock geochemical and paragenetic sequence also reveal the evolution of the composition of the fluid source through time. These results shed light on the geometry of the cold nose above the interface, with implications for volatile budget estimates, rheology of the plate interface (including the various types of seismicity) as well as the interpretation of Vp/Vs ratios from active subduction settings worldwide.& &
Publisher: Cambridge University Press (CUP)
Date: 22-04-2018
Publisher: Geological Society of America
Date: 04-2009
DOI: 10.1130/G25452A.1
Publisher: Geological Society of America
Date: 13-04-2020
DOI: 10.1130/G47126.1
Abstract: Localized rheological weakening is required to initiate and sustain intracontinental orogenesis, but the reasons for weakening remain debated. The intracontinental Alice Springs orogen dominates the lithospheric architecture of central Australia and involved prolonged (450–300 Ma) but episodic mountain building. The mid-crustal core of the orogen is exposed at its eastern margin, where field relationships and microstructures demonstrate that deformation was accommodated in biotite-rich shear zones. Rheological weakening was caused by localized melt-present deformation coupled with melt-induced reaction softening. This interpretation is supported by the coeval and episodic nature of melt-present deformation, igneous activity, and sediment shed from the developing orogen. This study identifies localized melt availability as an important ingredient enabling intracontinental orogenesis.
Publisher: Springer Science and Business Media LLC
Date: 29-05-2022
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 08-2022
Publisher: American Geophysical Union (AGU)
Date: 29-03-2023
DOI: 10.1029/2022TC007605
Abstract: Deep Slow Slip and Tremors (SSTs) are a combination of transient clusters of tectonic tremors and slow slip associated with extremely elevated fluid pressures. SSTs are thought to reflect a transition from viscous to brittle plate interface rheology and likely exert a first‐order control on megathrust seismicity. Nevertheless, the deformation mechanisms governing the source of SSTs remain elusive. We herein document the occurrence of vein networks precipitated and brecciated within the deep SST region under blueschist‐facies conditions. These lawsonite‐rich vein sets exhibit extensive evidence of brittle deformation and are spatially related to localized, finely milled (cataclastic) shear bands. Petro‐geochemical data reveal that brittle deformation was accompanied by the injection of several ultramafic‐, mafic‐ and metasedimentary‐derived fluid pulses, imprinting characteristic Cr, high field strength elements, and light over heavy rare earth elements positive anomalies in the vein breccias while leaching light rare earth elements from the cataclastic blueschist host. Our results suggest that metamorphic veins represent zones of mechanical anisotropy within the rock volume prone to localized shearing, brittle deformation and episodic injection of externally derived fluids. These networks demonstrate the importance of former vein sets as structural heterogeneities in triggering fluid‐controlled brittle creep events. The combined effects of high pore fluid pressures and rheological heterogeneities in the form of metamorphic veins could trigger the nucleation and propagation of SSTs at the margins of this mechanically anisotropic environment, and thus determine where slip will take place along deep subduction interfaces.
Publisher: Elsevier BV
Date: 04-2009
Publisher: Wiley
Date: 15-10-2022
DOI: 10.1111/JMG.12635
Abstract: The Entia Gneiss Complex represents the mid‐crustal core of the intracontinental Alice Springs Orogen. Located in the Harts Range, central Australia, it is characterized by the development of a domal structure including two sub‐domes separated by a steeply dipping median high‐strain zone. Dominantly, orthogneiss basement crops out through a structurally overlying cover sequence represented by the Harts Range Group and records evidence of hydration, recrystallization, and partial melting of precursor Paleoproterozoic granulite facies assemblages at hibolite facies conditions. The structurally lowest parts of the Harts Range Group were metamorphosed to peak conditions of 10.5 kbar and ~880°C during rift‐related magmatism at 480–460 Ma, immediately prior to the onset of the Alice Springs Orogeny at 450–300 Ma. By contrast, the underlying Entia Gneiss Complex records widespread metamorphism and wet melting at upper hibolite facies conditions. Phase equilibrium modelling and in situ LA–ICP–MS geochronology of rare, low‐variance kyanite–garnet‐bearing metapelites indicate that maximum P–T conditions of ~9 kbar and ~680°C were reached between c . 360–330 Ma, demonstrating a distinctive metamorphic and temporal evolution relative to the overlying Harts Range Group that can be linked to rheological stratification. Based on the integration of our results with existing monazite, zircon, and titanite geochronology, we interpret doming of the Entia Gneiss Complex to have involved compressive ascent of rheologically weakened crust below a region of extending upper crust near the termination of the Alice Springs Orogeny. In this way, the Harts Range Group represents a cooled, locally extending thrust sheet over ductile basement quasi‐concurrent with doming. Texturally‐late sillimanite combined with increasing Y content in monazite indicates high‐temperature, kyanite‐grade metamorphism was closely followed by decompression (3–4 kbar drop from peak conditions) and rapid cooling below 600°C during emplacement of the Entia Gneiss Complex at shallower crustal levels. The findings of this study highlight the feedback between hydration, retrogression, rheological weakening, and strain accommodation, thus allowing better evaluation of the thermomechanical history of gneiss dome formation within a narrow ( km wide) preconditioned intracontinental corridor. First modern P–T–t framework for gneiss dome formation in the Entia Gneiss Complex, central Australia. The onset of metamorphism, partial melting and ductile flow at c . 360 Ma was catalysed by hydration of granulite facies basement during rift inversion. Rapid exhumation of partially molten crust from depths of km is marked by fluid‐mediated resetting of monazite down to c . 310 Ma. Rheological stratification enabled and accelerated exhumation of the highest‐grade corridor of a narrow intracontinental orogen.
Publisher: Wiley
Date: 15-02-2019
DOI: 10.1111/JMG.12471
Publisher: American Geophysical Union (AGU)
Date: 11-2019
DOI: 10.1029/2019GC008418
Publisher: Wiley
Date: 19-02-2021
DOI: 10.1111/JMG.12592
Abstract: In this study, we focus on a partially melted garnet‐bearing granulite from the Salvador–Esplanade Belt (Salvador da Bahia, Brazil), and examine the behaviour of major and trace elements during partial melting and melt‐driven metasomatism. Phase equilibria modelling and U–Th–Pb geochronology show that the s le underwent partial melting during the heating segment of the decompression path from ~1.2 GPa and 675–700°C to ~0.8 GPa and 790°C at c . 2.06 Ga. During the final stage of decompression, from 0.8 to ~0.5 GPa, physical segregation of melt resulted in the establishment of chemical potential gradients and mass transfer between the host granulite and the leucosome. Modelling shows that H 2 O, CaO, K 2 O, and Na 2 O diffused from the melt into the host residue, whereas SiO 2 was transferred from the host granulite into the adjacent leucosome. Opposed senses of diffusional transfer resulted in the formation of a quartz‐rich anhydrous leucosome and a quartz‐depleted selvedge in the host granulite. Compositional maps show that garnet exhibit contrasting major and trace element distributions depending on their textural position. The largest garnet located in the quartz‐depleted selvedge preserve their original Ca and trace element growth zoning. A transition from bell‐shaped profiles for Y and heavy rare earth elements to bowl‐shaped profiles for light rare earth elements is consistent with a typical Rayleigh fractionation model, fast intergranular element mobility, and rock‐wide equilibrium during prograde partial melting. In contrast, smaller garnet away from the leucosome show prograde growth zoning modified by intragranular diffusion, as evidenced by a network of open channels and healed cracks that act as connecting pathways between the matrix and garnet core. This results in either subtle modification of both major and trace elements adjacent to the inner core inclusions, or a complete re‐equilibration. Recognition that the original Ca growth zoning was later modified by intragranular diffusion implies that misleading thermobarometric results and tectonic interpretations would be obtained if the core composition was used to fingerprint the early garnet nucleation stage. This study demonstrates that at high temperature ( °C) and in the presence of melt, REE are not less vulnerable to diffusive resetting than alent cations like Ca 2+ .
Publisher: Wiley
Date: 21-12-2021
DOI: 10.1111/JMG.12570
Publisher: Springer Science and Business Media LLC
Date: 16-03-2017
Publisher: Informa UK Limited
Date: 10-02-2020
Publisher: Elsevier BV
Date: 06-2023
Publisher: Wiley
Date: 22-01-2021
DOI: 10.1111/JMG.12590
Abstract: The Arkaroola region of the northern Flinders Ranges, South Australia, records high geothermal gradient mineral assemblages that are not spatially or temporally associated with intrusive magmatism. Cordierite‐bearing schists from the base of a ~12 km thick Neoproterozoic sedimentary sequence known as the Adelaide Rift Complex directly overlie Mesoproterozoic metasedimentary and granitic rocks with regional heat production values of ~7.9 µW/m 3 at 580 Ma, two to three times greater than global average values for granitic rocks. We integrate in‐situ U–Pb monazite geochronology, Y+HREE‐in‐monazite thermometry and mineral equilibria modelling to show that rocks at the base of the sedimentary succession record hibolite facies metamorphism at c . 580 Ma while the overlying sediments were still accumulating. Metamorphism took place under average geothermal gradient conditions in excess of 180°C/kbar ( °C/km) that propagated to depths of at least 12 km. These thermal gradients persisted for upwards of 150 Ma, maintained by a lack of crustal erosion, and are documented by long‐lived crustal anatexis. This system may be the archetypal ex le of Th–U powered metamorphism, recording the interplay between chemically extreme basement and thermally insulating sedimentary cover.
Publisher: Wiley
Date: 31-10-2014
DOI: 10.1111/JMG.12056
Publisher: American Geophysical Union (AGU)
Date: 08-2010
DOI: 10.1029/2009TC002504
Publisher: Elsevier BV
Date: 09-2018
Publisher: American Geophysical Union (AGU)
Date: 12-2018
DOI: 10.1029/2018TC005106
Abstract: The accommodation of intraplate stresses in preexisting weak regions of plate interiors is here investigated using thin viscous sheet numerical models. The intraplate stresses are governed by multicomponent and multidirectional stresses originating at plate boundaries. The modeled scenarios mimic plate boundary conditions during the intraplate Alice Springs Orogeny (ASO), central Australia, and include (1) a northwest‐southeast zone of weak lithosphere within strong continental blocks to the north and southand (2) a principal south directed stress condition at the northern boundary that causes minor clockwise rotation of the northern block. Alternative tectonic environments are investigated in additional models that include (1) secondary compressional or extensional stresses acting at the eastern boundary, representing the temporally variable stress conditions during the Tasmanides Orogeny, and (2) an eastern wedge‐shaped zone of rheologically weak lithosphere, mirroring rift fill of the Irindina subbasin. Our results highlight that a low angle between major crustal features (e.g., orogenic elongation and preexisting regional structures) and the principal transmitted stresses is highly relevant in the concentration of elevated levels of differential stress and subsequent localization of deformation in plate interiors. Secondary stresses orthogonal to the principal acting stresses may introduce effects that explain the episodic orogenic activity in the case of the ASO. The combination of secondary extensional stresses at the eastern boundary of Australia and weak lithosphere of the preexisting Irindina subbasin strongly influences the observed spatial strain intensity, localization, and kinematics of deformation during the ASO.
Publisher: Geological Society of America
Date: 06-2013
DOI: 10.1130/G34043.1
Publisher: Elsevier BV
Date: 07-2022
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 2020
Publisher: Elsevier BV
Date: 05-2022
Publisher: Elsevier BV
Date: 11-2013
Publisher: Cambridge University Press (CUP)
Date: 04-12-2018
DOI: 10.1017/S0954102017000451
Abstract: In this study, in situ and erratic s les from George V Coast (East Antarctica) and southern Eyre Peninsula (Australia) have been used to characterize the microstructural, pressure–temperature and geochronological record of upper hibolite and granulite facies polymetamorphism in the Mawson Continent to provide insight into the spatial distribution of reworking and the subice geology of the Mawson Continent. Monazite U-Pb data shows that in situ s les from the George V Coast record exclusively 2450–2400 Ma ages, whereas most erratic s les from glacial moraines at Cape Denison and the Red Banks Charnockite record only 1720–1690 Ma ages, consistent with known ages of the Sleaford and Kimban events, respectively. Phase equilibria forward modelling reveals considerable overlap of the thermal character of these two events. S les with unimodal 1720–1690 Ma Kimban ages reflect either formation after the Sleaford event or complete metamorphic overprinting. Rocks recording only 2450–2400 Ma ages were unaffected by the younger Kimban event, perhaps as a result of unreactive rock compositions inherited from the Sleaford event. Our results suggest the subice geology of the Mawson Continent is a pre-Sleaford-aged terrane with a cover sequence reworked during the Kimban event.
Publisher: Copernicus GmbH
Date: 28-03-2022
DOI: 10.5194/EGUSPHERE-EGU22-6734
Abstract: & & High-grade metamorphic rocks can record the dynamic processes that lead to crustal heating and a departure from normal crustal geothermal gradients. High temperatures in the Archean crust led to particularly significant melt generation and cratonic stabilization, and understanding the depths, temperatures and rates of Archean metamorphism may reflect our clearest window into possible tectonic styles at this time. However, several Archean metamorphic terranes record polymetamorphism, and unravelling the pressure-temperature-time (& em& P-T-t& /em& ) histories of such terranes has proven difficult, with complexity inherent in both chronologic and petrologic data.& & & & Here we synthesize results of a multi-analytical study in which garnet and monazite petrochronology, coupled with thermodynamic and diffusion modeling, were applied to Archean granulites from the Beartooth Mountains in the northern Wyoming Province, U.S.A. The data reveal two phases of garnet growth and high-temperature metamorphism. Garnet cores grew coeval with emplacement of a granitoid batholith at ~2.78-2.76 Ga. This was followed by a distinct, second phase of peritectic garnet rim growth at ~2.71 Ga, during biotite breakdown melting at peak temperatures of ~750& #730 C. Diffusion modeling of chemical zoning in garnet rims shows that this second event was brief: near-peak temperatures were maintained for & 1 Myrs. In contrast, core and rim dates of garnet from a meta-granitoid from the same outcrop record only the initial phase of growth, most likely because a lack of grain boundary fluids inhibited further crystallization in these rocks. Evidence for this second event is cryptic in other granitoid s les, such that this period of heating to at least 750& #730 C, ~50-100 Myrs after initial batholith emplacement, is poorly recorded in the broader rock record of the Beartooths.& & & & The results of our study show that different parts of the metamorphic history of a rock may be recorded differently between garnet and accessory phases. Lastly, while field and petrologic evidence for polymetamorphism may be cryptic, direct dating of distinct garnet growth zones with preserved major and trace element zonation allows for a clear interpretation between isotopic dates and the metamorphic history of the rock.& &
Publisher: Geological Society of London
Date: 29-03-2019
DOI: 10.1144/SP478.3
Publisher: Elsevier BV
Date: 06-2020
Publisher: Geological Society of America
Date: 12-05-2022
DOI: 10.1130/G50066.1
Abstract: We report the finding of rare eclogite-facies vugs forming millimeter- to centimeter-sized pockets in meta-ophiolites from the western European Alps. Euhedral garnet crystals covering the vug walls display oscillatory chemical zoning for a wide range of major and trace elements, including Cr, Mn, and rare earth elements. Thermodynamic modeling revealed that closed-system fluid production through the breakdown of prograde glaucophane, lawsonite, and chlorite between 505 °C and 525 °C can successfully explain porosity creation of ~4% and the mineralogical properties of the vugs. Available geologic and geochronologic constraints indicate that the eclogitization of the downgoing mafic crust spanned a window of at least 1 m.y. These observations can only be explained by the presence of extremely low permeability values (& −22 m2) to keep the fluid confined at the meter scale within vugs on such time scales. Our field-based report of eclogite porosity provides the first in situ confirmation of previous experimental data and geophysical estimates on active margins. A substantial amount of fluid trapped in this porosity may be carried deeper than expected into Earth's mantle, with implications for volatile recycling budgets.
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 11-2013
Publisher: Elsevier BV
Date: 2019
Publisher: Informa UK Limited
Date: 03-10-2015
Publisher: Wiley
Date: 26-04-2011
Publisher: Elsevier BV
Date: 09-2023
Publisher: Elsevier BV
Date: 03-0009
Publisher: American Chemical Society (ACS)
Date: 11-03-2022
Publisher: Wiley
Date: 09-01-2012
Publisher: Informa UK Limited
Date: 11-11-2020
Publisher: Wiley
Date: 18-09-2021
Start Date: 2016
End Date: 2018
Funder: Australian Research Council
View Funded ActivityStart Date: 2020
End Date: 2022
Funder: Australian Research Council
View Funded ActivityStart Date: 2016
End Date: 2018
Funder: Australian Research Council
View Funded ActivityStart Date: 2014
End Date: 2014
Funder: Australian Research Council
View Funded ActivityStart Date: 2015
End Date: 2015
Funder: Australian Research Council
View Funded ActivityStart Date: 2018
End Date: 2018
Funder: Australian Research Council
View Funded ActivityStart Date: 2016
End Date: 12-2019
Amount: $319,500.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2015
End Date: 12-2015
Amount: $860,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2014
End Date: 12-2014
Amount: $360,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2021
End Date: 09-2022
Amount: $715,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 11-2016
End Date: 11-2020
Amount: $225,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2018
End Date: 12-2019
Amount: $464,531.00
Funder: Australian Research Council
View Funded ActivityStart Date: 05-2020
End Date: 12-2023
Amount: $222,301.00
Funder: Australian Research Council
View Funded Activity