ORCID Profile
0000-0002-3737-3818
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 | Isotope Geochemistry | Tectonics | Geotectonics | Geochronology | Geochemistry | Inorganic Geochemistry | Sedimentology | Igneous And Metamorphic Petrology | Geology | Structural Geology | Geodynamics | Marine geoscience | Microbial genetics | Earth system sciences | Structural Geology
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Earth Sciences | Earth sciences | Mineral Exploration not elsewhere classified | Precious (Noble) Metal Ore Exploration | Energy Exploration not elsewhere classified |
Related Links
Publications
Complexity of In-situ zircon U–Pb–Hf isotope systematics during arc magma genesis at the roots of a Cretaceous arc, Fiordland, New Zealand
Publisher: Elsevier BV
Date: 11-2016
Kyanite-paragonite-bearing assemblages, northern Fiordland, New Zealand: Rapid cooling of the lower crustal root to a Cretaceous magmatic arc
Publisher: Wiley
Date: 12-2002
Tectonic cycles of the New England Orogen, eastern Australia: A Review
Publisher: Informa UK Limited
Date: 27-02-2019
Thermomechanical evolution of the crust during convergence and deep crustal pluton emplacement in the western province of Fiordland, New Zealand
Publisher: American Geophysical Union (AGU)
Date: 12-07-2002
DOI: 10.1029/2001TC001282
A detrital record of lower oceanic crust exhumation within a Miocene slow-spreading ridge: Macquarie Island, Southern Ocean
Publisher: Geological Society of America
Date: 18-10-2011
DOI: 10.1130/B30082.1
Basin analysis in polymetamorphic terranes: An example from east Antarctica
Publisher: Elsevier BV
Date: 07-2013
Metastable persistence of pelitic metamorphic assemblages at the root of a Cretaceous magmatic arc - Fiordland, New Zealand
Publisher: Wiley
Date: 16-03-2009
Macquarie Island's Finch-Langdon fault: A ridge-transform inside-corner structure
Publisher: Geological Society of America
Date: 2003
DOI: 10.1130/G19441.1
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.
Geochronology and geochemistry of high-pressure granulites of the Arthur River Complex, Fiordland, New Zealand: Cretaceous magmatism and metamorphism on the palaeo-Pacific Margin
Publisher: Wiley
Date: 11-03-2003
Transformation of two-pyroxene hornblende granulite to garnet granulite involving simultaneous melting and fracturing of the lower crust, Fiordland, New Zealand
Publisher: Wiley
Date: 09-2001
Evidence for melt migration enhancing recrystallization of metastable assemblages in mafic lower crust, Fiordland, New Zealand
Publisher: Wiley
Date: 02-2009
Glassy fragmental rocks of Macquarie Island (Southern Ocean): Mechanism of formation and deposition
Publisher: Elsevier BV
Date: 04-2009
Enriching mantle melts within a dying mid-ocean spreading ridge: Insights from Hf-isotope and trace element patterns in detrital oceanic zircon
Publisher: Elsevier BV
Date: 10-2011
Melt-present shear zones enable intracontinental orogenesis
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.
Zircon U-Pb isotopic and geochemical study of metanorites from the chromite-mineralised Bacuri Mafic-Ultramafic Complex: Insights of a Paleoarchean crust in the Amapá Block, Guyana Shield, Brazil
Publisher: Elsevier BV
Date: 05-2022
Mass transfer in the lower crust: Evidence for incipient melt assisted flow along grain boundaries in the deep arc granulites of Fiordland, New Zealand
Publisher: American Geophysical Union (AGU)
Date: 09-2016
DOI: 10.1002/2015GC006236
Mineral equilibria modeling of the granulite-eclogite transition: Effects of whole-rock composition on metamorphic facies type-assemblages
Publisher: Oxford University Press (OUP)
Date: 21-02-2012
Microstructures reveal multistage melt present strain localisation in mid-ocean gabbros
Publisher: Elsevier BV
Date: 08-2020
Tectonic implications of fault-scarp–derived volcaniclastic deposits on Macquarie Island: Sedimentation at a fossil ridge-transform intersection?
Publisher: Geological Society of America
Date: 2005
DOI: 10.1130/B25469.1
Provenance of Upper Jurassic–Lower Cretaceous strata in the Mentelle Basin, southwestern Australia, reveals a trans-Gondwanan fluvial pathway
Publisher: Elsevier BV
Date: 05-2021
Chemical signatures of melt-rock interaction in the root of a magmatic arc
Publisher: Oxford University Press (OUP)
Date: 02-2018
Cordillera zealandia: A mesozoic arc fare-up on the palaeo-pacific Gondwana Margin
Publisher: Springer Science and Business Media LLC
Date: 21-03-2017
DOI: 10.1038/S41598-017-00347-W
Abstract: Two geochemically and temporally distinct components of the Mesozoic Zealandia Cordilleran arc indicate a shift from low to high Sr/Y whole rock ratios at c. 130 Ma. Recent mapping and a reappraisal of published Sr-Nd data combined with new in-situ zircon Hf isotope analyses supports a genetic relationship between the two arc components. A reappraisal of geophysical, geochemical and P-T estimates demonstrates a doubling in thickness of the arc to at least 80 km at c. 130 Ma. Contemporaneously, magmatic addition rates shifted from ~14 km 3 /my per km of arc to a flare-up involving ~100 km 3 /my per km of arc. Excursions in Sr-Nd-Hf isotopic ratios of flare-up rocks highlight the importance of crust-dominated sources. This pattern mimics Cordilleran arcs of the Americas and highlights the importance of processes occurring in the upper continental plates of subduction systems that are incompletely reconciled with secular models for continental crustal growth.
Pinch and swell structures: evidence for strain localisation by brittle–viscous behaviour in the middle crust
Publisher: Copernicus GmbH
Date: 02-09-2015
Abstract: Abstract. The flow properties of middle crustal rocks are commonly represented by viscous flow. Ex les of pinch and swell structures found in a high strain zone at St. Anne Point (Fiordland, New Zealand) and Wongwibinda (N.S.W., Australia) suggest pinch and swell structures may be initiated by brittle failure of the more competent layer in conjunction with subsequent material softening. On this basis we develop a numerical model where Mohr–Coulomb constitutive strain localising behaviour is utilised to initiate pinch and swell structure development. Results show that pinch and swell structures develop in a competent layer in both Newtonian and non-Newtonian flow, provided the competent layer has sufficient viscosity contrast and can localise strain to form shear bands. The flow regime and strain localising characteristics of the surrounding country rock appear not to impact pinch and swell structure formation. The degree of material softening after the initial strain localising behaviour is shown to impact pinch and swell characteristics, while extensive material softening causes the formation of thick necks between swells by limiting the focused localisation of strain into shear bands. To aid analysis of the structures and help derive the flow properties of rocks in the field, we define three stages of pinch and swell development and offer suggestions for measurements to be made in the field. Our study suggests that Mohr–Coulomb strain localising behaviour combined with viscous flow is a viable alternative representation of the heterogeneous rheological behaviour of rocks seen in the middle crust. This type of mid-crustal rheological behaviour can have significant influence on the localisation of strain at all scales. For ex le, inclusion of Mohr–Coulomb strain localising behaviour with viscous flow in just some mid-crustal layers within a crustal-scale model can result in significant strain localisation, extending from the upper crust into the middle crust. This localisation also influences the development of near-surface structures.
The critical role of deformation-assisted melt migration in the formation of oceanic core complexes
Publisher: Informa UK Limited
Date: 09-10-2023
The effect of pre‐tectonic reaction and annealing extent on behaviour during subsequent deformation: insights from paired shear zones in the lower crust of Fiordland, New Zealand
Publisher: Wiley
Date: 08-06-2015
DOI: 10.1111/JMG.12132
Direct observation of adakite melts generated in the lower continental crust, Fiordland, New Zealand
Publisher: Wiley
Date: 02-2005
Provenance of rifted continental crust at the nexus of East Gondwana breakup
Publisher: Elsevier BV
Date: 02-2020
Structural evolution of the Dayman dome metamorphic core complex, eastern Papua New Guinea
Publisher: Geological Society of America
Date: 30-09-2011
DOI: 10.1130/B30326.1
Experimental alteration of monazite in granitic melt: Variable U–Th–Pb and REE mobility during melt-mediated coupled dissolution-precipitation
Publisher: Elsevier BV
Date: 06-2020
The evolution of zircon during low‐P partial melting of metapelitic rocks: theoretical predictions and a case study from Mt Stafford, central Australia
Publisher: Wiley
Date: 27-05-2014
DOI: 10.1111/JMG.12091
Evaluating the importance of metamorphism in the foundering of continental crust
Publisher: Springer Science and Business Media LLC
Date: 12-10-2017
DOI: 10.1038/S41598-017-13221-6
Abstract: The metamorphic conditions and mechanisms required to induce foundering in deep arc crust are assessed using an ex le of representative lower crust in SW New Zealand. Composite plutons of Cretaceous monzodiorite and gabbro were emplaced at ~1.2 and 1.8 GPa are parts of the Western Fiordland Orthogneiss (WFO) ex les of the plutons are tectonically juxtaposed along a structure that excised ~25 km of crust. The 1.8 GPa Breaksea Orthogneiss includes suitably dense minor components (e.g. eclogite) capable of foundering at peak conditions. As the eclogite facies boundary has a positive dP/dT , cooling from supra-solidus conditions ( T 950 ºC) at high- P should be accompanied by omphacite and garnet growth. However, a high monzodioritic proportion and inefficient metamorphism in the Breaksea Orthogneiss resulted in its positive buoyancy and preservation. Metamorphic inefficiency and compositional relationships in the 1.2 GPa Malaspina Pluton meant it was never likely to have developed densities sufficiently high to founder. These relationships suggest that the deep arc crust must have primarily involved significant igneous accumulation of garnet–clinopyroxene (in proportions %). Crustal dismemberment with or without the development of extensional shear zones is proposed to have induced foundering of excised cumulate material at P 1.2 GPa.
Glimmerite: a product of melt-rock interaction within a crustal-scale high-strain zone
Publisher: Elsevier BV
Date: 05-2022
Corrigendum
Publisher: Informa UK Limited
Date: 12-2010
Granulite facies thermal aureoles and metastable amphibolite facies assemblages adjacent to the Western Fiordland Orthogneiss in southwest Fiordland, New Zealand
Publisher: Wiley
Date: 06-2009
Evidence of Early Cretaceous collisional-style orogenesis in northern Fiordland, New Zealand and its effects on the evolution of the lower crust
Publisher: Elsevier BV
Date: 04-2001
The Keepit arc: provenance of sedimentary rocks in the central Tablelands Complex, southern New England Orogen, Australia, as recorded by detrital zircon
Publisher: Informa UK Limited
Date: 21-03-2017
The regional significance of Cretaceous magmatism and metamorphism in Fiordland, New Zealand, from U-Pb zircon geochronology
Publisher: Wiley
Date: 09-2004
The field and microstructural signatures of deformation‐assisted melt transfer: Insights from magmatic arc lower crust, New Zealand
Publisher: Wiley
Date: 29-05-2019
DOI: 10.1111/JMG.12488
Abstract: Melt must transfer through the lower crust, yet the field signatures and mechanisms involved in such transfer zones (excluding dykes) are still poorly understood. We report field and microstructural evidence of a deformation‐assisted melt transfer zone that developed in the lower crustal magmatic arc environment of Fiordland, New Zealand. A 30–40 m wide hornblende‐rich body comprising hornblende ± clinozoisite and/or garnet exhibits 'igneous‐like' features and is hosted within a metamorphic, two‐pyroxene–pargasite gabbroic gneiss (GG). Previous studies have interpreted the hornblende‐rich body as an igneous cumulate or a mass transfer zone. We present field and microstructural characteristics supporting the later and indicating the body has formed by deformation‐assisted, channelized, reactive porous melt flow. The host granulite facies GG contains distinctive rectilinear dykes and garnet reaction zones (GRZ) from earlier in the geological history these form important reaction and strain markers. Field observations show that the mineral assemblages and microstructures of the GG and GRZ are progressively modified with proximity to the hornblende‐rich body. At the same time, GRZ bend systematically into the hornblende‐rich body on each side of the unit, showing apparent sinistral shearing. Within the hornblende‐rich body itself, microstructures and electron back‐scatter diffraction mapping show evidence of the former presence of melt including observations consistent with melt crystallization within pore spaces, elongate pseudomorphs of melt films along grain boundaries, minerals with low dihedral angles as small as ° and up to °, and interconnected 3D melt pseudomorph networks. Reaction microstructures with highly irregular contact boundaries are observed at the field and thin‐section scale in remnant islands of original rock and replaced grains, respectively. We infer that the hornblende‐rich body was formed by modification of the host GG in situ due to reaction between an externally derived, reactive, hydrous gabbroic to intermediate melt percolating via porous melt flow through an actively deforming zone. Extensive melt–rock interaction and metasomatism occurred via coupled dissolution–precipitation, triggered by chemical disequilibrium between the host rock and the fluxing melt. As a result, the host plagioclase and pyroxene became unstable and were reacted and dissolved into the melt, while hornblende and to a lesser extent clinozoisite and garnet grew replacing the unstable phases. Our study shows that hornblendite rocks commonly observed within deep crustal sections, and attributed to cumulate fractionation processes, may instead delineate areas of deformation‐assisted, channelized reactive porous melt flow formed by melt‐mediated coupled dissolution–precipitation replacement reactions.
Interaction of Gravity Flows With a Rugged Mid-Ocean-Ridge Seafloor: An Outcrop Example from Macquarie Island
Publisher: Society for Sedimentary Geology
Date: 05-2011
DOI: 10.2110/JSR.2011.30
Metamorphism in the New England Orogen, eastern Australia: a review
Publisher: Informa UK Limited
Date: 02-02-2020
Recognition of melferite – A rock formed in syn-deformational high-strain melt-transfer zones through sub-solidus rocks: A review and synthesis of microstructural criteria
Publisher: Elsevier BV
Date: 11-2022
Inefficient high-temperature metamorphism in orthogneiss
Publisher: Mineralogical Society of America
Date: 2019
DOI: 10.2138/AM-2019-6503
Oceanic Zircon Records Extreme Fractional Crystallization of MORB to Rhyolite on the Alarcon Rise Mid-Ocean Ridge
Publisher: Oxford University Press (OUP)
Date: 29-04-2022
DOI: 10.1093/PETROLOGY/EGAC040
Abstract: The first known occurrence of rhyolite along the submarine segments of the mid-ocean ridge (MOR) system was discovered on Alarcon Rise, the northernmost segment of the East Pacific Rise (EPR), by the Monterey Bay Aquarium Research Institute in 2012. Zircon trace element and Hf and O isotope patterns indicate that the rhyolite formed by extreme crystal fractionation of primary mid-ocean ridge basalt (MORB) sourced from normal to enriched MOR mantle with little to no addition of continental lithosphere or hydrated oceanic crust. A large range in zircon ɛHf spanning 11 ɛ units is comparable to the range of whole rock ɛHf from the entire EPR. This variability is comparable to continental granitoids that develop over long periods of time from multiple sources. Zircon geochronology from Alarcon Rise suggests that at least 20 kyr was needed for rhyolite petrogenesis. Grain-scale textural discontinuities and trace element trends from zircon cores and rims are consistent with crystal fractionation from a MORB magma with possible perturbations associated with mixing or replenishment events. Comparison of whole rock and zircon oxygen isotopes with modeled fractionation and zircon-melt patterns suggests that, after they formed, rhyolite magmas entrained hydrated mafic crust from conduit walls during ascent and/or were hydrated by seawater in the vent during eruption. These data do not support a model where rhyolites formed directly from partial melts of hydrated oceanic crust or do they require assimilation of such crust during fractional crystallization, both models being commonly invoked for the formation of oceanic plagiogranites and dacites. A spatial association of highly evolved lavas (rhyolites) with an increased number of fault scarps on the northern Alarcon Rise might suggest that low magma flux for ~20 kyr facilitated extended magma residence necessary to generate rhyolite from MORB.
Flare-up in Cordilleran arcs controlled by fluxes in subduction water budgets
Publisher: Authorea, Inc.
Date: 29-09-2023
High-T–low-Pthermal anomalies superposed on biotite-grade rocks, Wongwibinda Metamorphic Complex, southern New England Orogen, Australia: heat advection by aqueous fluid?
Publisher: Informa UK Limited
Date: 07-2013
Oxide enrichment by syntectonic melt-rock interaction
Publisher: Elsevier BV
Date: 04-2022
Determining relative bulk viscosity of kilometre-scale crustal units using field observations and numerical modelling
Publisher: Elsevier BV
Date: 11-2017
High-Ultrahigh Temperature Metamorphism in the Larsemann Hills: Insights into the Tectono-Thermal Evolution of the Prydz Bay Region, East Antarctica
Publisher: Oxford University Press (OUP)
Date: 27-01-2022
DOI: 10.1093/PETROLOGY/EGAC002
Abstract: As one of the widest terranes exposed in icy Antarctica, the Larsemann Hills in the Prydz Bay belt preserves erse rock types with a complex metamorphic history and thus is critical to the tectono-metamorphic evolution of East Antarctica. Garnet-sillimanite-spinel-cordierite–bearing and garnet-orthopyroxene–bearing granulites are typical rocks in the region. Phase equilibrium modelling and mineral thermometry based on detailed petrological and mineralogical analyses indicate that the granulites underwent extreme metamorphism with peak conditions to ultrahigh temperatures (UHTs). The high-UHT metamorphism is characterised by extremely high dT/dP values (& °C/GPa) along a clockwise path with evident decompression at high temperatures and subsequent near isobaric cooling. Textural relationships, in situ NanoSIMS zircon U–Pb analysis, and LA-ICP-MS zircon and monazite dating and trace element analysis indicate protracted tectono-thermal evolution from the latest Neoproterozoic to early Palaeozoic (c. 570–500 Ma), with a prograde stage likely from c. 570 to c. 550 Ma, a peak stage from c. 550 to c. 540 Ma, and a retrograde stage from c. 540 to c. 500 Ma. During the retrograde stage, major decompression should have occurred before c. 530 Ma, as indicated by the age of zircon included in spinel, and then near isobaric cooling followed and persisted from c. 530 to c. 500 Ma. The geochronological data contribute to the establishment of the thermal–temporal framework of the late Neoproterozoic to early Palaeozoic Prydz tectonic event. The results also indicate that the assemblage of the investigated granulites basically resulted from the late Neoproterozoic to the early Palaeozoic tectono-thermal event, and the high-UHT conditions revealed by the granulites in the Larsemann Hills imply a much wider distribution of high heat flow and potential UHT metamorphism in the Prydz Bay region. Both the Larsemann Hills and the Rauer Group may have been in a similar and interrelated tectono-thermal setting from the late Neoproterozoic to the early Palaeozoic during the assembly of the Gondwana supercontinent.
Successive hydration and dehydration of high-P mafic granofels involving clinopyroxene-kyanite symplectites, Mt Daniel, Fiordland, New Zealand
Publisher: Wiley
Date: 30-08-2002
Mechanisms of melt extraction during lower crustal partial melting
Publisher: Wiley
Date: 18-08-2020
DOI: 10.1111/JMG.12561
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.
Cretaceous high‐P granulites at Milford Sound, New Zealand: metamorphic history and emplacement in a convergent margin setting
Publisher: Wiley
Date: 07-2000
Extension along the Australian‐Pacific transpressional transform plate boundary near Macquarie Island
Publisher: American Geophysical Union (AGU)
Date: 09-2003
DOI: 10.1029/2003GC000523
Kinematic vorticity and tectonic significance of superposed mylonites in a major lower crustal shear zone, northern Fiordland, New Zealand
Publisher: Elsevier BV
Date: 10-1999
High-temperature–low-pressure metamorphism and the production of S-type granites of the Hillgrove Supersuite, southern New England Orogen, NSW, Australia
Publisher: Informa UK Limited
Date: 11-02-2018
Petrogenesis and geochemical characterisation of ultramafic cumulate rocks from Hawes Head, Fiordland, New Zealand
Publisher: Informa UK Limited
Date: 12-2012
10Be, 18O and radiogenic isotopic constraints on the origin of adakitic signatures: a case study from Solander and Little Solander Islands, New Zealand
Publisher: Springer Science and Business Media LLC
Date: 29-08-2014
Anti-clockwise P-T paths in the lower crust: An example from a kyanite-bearing regional aureole, George Sound, New Zealand
Publisher: Wiley
Date: 2010
Hornblendite delineates zones of mass transfer through the lower crust
Publisher: Springer Science and Business Media LLC
Date: 22-08-2016
DOI: 10.1038/SREP31369
Abstract: Geochemical signatures throughout the layered Earth require significant mass transfer through the lower crust, yet geological pathways are under-recognized. Elongate bodies of basic to ultrabasic rocks are ubiquitous in exposures of the lower crust. Ultrabasic hornblendite bodies hosted within granulite facies gabbroic gneiss of the Pembroke Valley, Fiordland, New Zealand, are typical occurrences usually reported as igneous cumulate hornblendite. Their igneous features contrast with the metamorphic character of their host gabbroic gneiss. Both rock types have a common parent field relationships are consistent with modification of host gabbroic gneiss into hornblendite. This precludes any interpretation involving cumulate processes in forming the hornblendite these bodies are imposter cumulates. Instead, replacement of the host gabbroic gneiss formed hornblendite as a result of channeled high melt flux through the lower crust. High melt/rock ratios and disequilibrium between the migrating magma (granodiorite) and its host gabbroic gneiss induced dissolution (grain-scale magmatic assimilation) of gneiss and crystallization of mainly hornblende from the migrating magma. The extent of this reaction-replacement mechanism indicates that such hornblendite bodies delineate significant melt conduits. Accordingly, many of the ubiquitous basic to ultrabasic elongate bodies of the lower crust likely map the ‘missing’ mass transfer zones.
Decoding near-concordant U-Pb zircon ages spanning several hundred million years: Recrystallisation, metamictisation or diffusion?
Publisher: Springer Science and Business Media LLC
Date: 14-06-2012
Trace element partitioning during high-P partial melting and melt-rock interaction; an example from northern Fiordland, New Zealand
Publisher: Wiley
Date: 06-2004
Shape of pinch and swell structures as a viscosity indicator: Application to lower crustal polyphase rocks
Publisher: Elsevier BV
Date: 07-2016
Geology and Age of Solander Volcano, Fiordland, New Zealand
Publisher: University of Chicago Press
Date: 09-2013
DOI: 10.1086/671397
Modelling the partial melting of metasediments in a low-pressure regional contact aureole: the effect of water and whole-rock composition
Publisher: Cambridge University Press (CUP)
Date: 03-12-2018
DOI: 10.1017/S001675681800078X
Abstract: Low-pressure regional aureoles with steep metamorphic field gradients are critical to understanding progressive metamorphism in high-temperature metasedimentary rocks. Delicately layered pelitic and psammitic metasedimentary rocks at Mt Stafford, central Australia, record a greenschist- to granulite-facies Palaeoproterozoic regional aureole, associated with S-type granite plutons, reflecting metamorphism in the range 500–800 °C and at ∼3 kbar. The rocks experienced minimal deformation during metamorphism and partial melting. Partial melting textures evolve progressively along the steep metamorphic field gradient from the incipient stages of melting marked by cuspate grains with low dihedral angles, to melt proportions sufficient to form diatexite with schollen. Phase equilibria modelling in the NCKFMASHTO system for pelitic, semi-pelitic and high- and low-ferromagnesian psammitic s les quantitatively illustrates the dependence of partial melting on rock composition and water volume. Pelitic compositions are more fertile than psammitic compositions when the water content in the rocks is low, especially during the early stages of melting. The whole-rock ferromagnesian component additionally influences melt fertility, with ferromagnesian-rich psammite being more fertile than psammite with a lower ferromagnesian component. Subtle variations in free water content can result in obvious changes in melt volume but limited variation in melt composition. Distinct melting histories of pelitic and psammitic rocks inferred from field relationships may be partially attributed to potential differences in water volume retained to super-solidus conditions. Melt composition is more dependent on the rock composition than the variation in water content.
Two belts of HTLP sub-regional metamorphism in the New England Orogen, eastern Australia: occurrence and characteristics exemplified by the Wongwibinda Metamorphic Complex
Publisher: Informa UK Limited
Date: 27-01-2020
Identifying relic igneous garnet and clinopyroxene in eclogite and granulite, Breaksea orthogneiss, New Zealand
Publisher: Oxford University Press (OUP)
Date: 03-07-2013
Ductile Deformation Without Localization: Insights From Numerical Modeling
Publisher: American Geophysical Union (AGU)
Date: 12-2019
DOI: 10.1029/2019GC008633
A Multiproxy provenance approach to uncovering the assembly of East Gondwana in Antarctica
Publisher: Geological Society of America
Date: 13-05-2019
DOI: 10.1130/G45952.1
Discovery of a microcontinent (Gulden Draak Knoll) offshore Western Australia: Implications for East Gondwana reconstructions
Publisher: Elsevier BV
Date: 10-2015
Intracontinental Orogeny Enhanced by Far‐Field Extension and Local Weak Crust
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.
Symplectite formation in the presence of a reactive fluid: insights from hydrothermal experiments
Publisher: Wiley
Date: 07-12-2016
DOI: 10.1111/JMG.12231
Crustal Differentiation in a Thickened Arc-Evaluating Depth Dependences
Publisher: Oxford University Press (OUP)
Date: 03-2016
The role of buoyancy in the fate of ultra-high-pressure eclogite
Publisher: Springer Science and Business Media LLC
Date: 27-12-2019
DOI: 10.1038/S41598-019-56475-Y
Abstract: Eclogite facies metamorphism of the lithosphere forms dense mineral assemblages at high- (1.6–2.4 GPa) to ultra-high-pressure ( .4–12 GPa: UHP) conditions that drive slab-pull forces during its subduction to lower mantle conditions. The relative densities of mantle and lithospheric components places theoretical limits for the re-exposure, and peak conditions expected, of subducted lithosphere. Exposed eclogite terranes dominated by rock denser than the upper mantle are problematic, as are interpretations of UHP conditions in buoyant rock types. Their subduction and exposure require processes that overcame predicted buoyancy forces. Phase equilibria modelling indicates that depths of 50–60 km (P = 1.4–1.8 GPa) and 85–160 km (P = 2.6–5 GPa) present thresholds for pull force in end-member oceanic and continental lithosphere, respectively. The point of no-return for subducted silicic crustal rocks is between 160 and 260 km (P = 5.5–9 GPa), limiting the likelihood of stishovite–wadeite–K-hollandite-bearing assemblages being preserved in equilibrated assemblages. The subduction of buoyant continental crust requires its anchoring to denser mafic and ultramafic lithosphere in ratios below 1:3 for the continental crust to reach depths of UHP conditions (85–160 km), and above 2:3 for it to reach extreme depths ( km). The buoyant escape of continental crust following its detachment from an anchored situation could carry minor proportions of other rocks that are denser than the upper mantle. However, instances of rocks returned from well-beyond these limits require exceptional exhumation dynamics, plausibly coupled with the effects of incomplete metamorphism to retain less dense low-P phases.
Roles for fluid and/or melt advection in forming high‐P mafic migmatites, Fiordland, New Zealand
Publisher: Wiley
Date: 03-08-2005
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.
Mesoproterozoic Tasmania: Witness to the East Antarctica–Laurentia connection within Nuna
Publisher: Geological Society of America
Date: 28-07-2015
DOI: 10.1130/G36850.1
Exhumation of the Dayman dome metamorphic core complex, eastern Papua New Guinea
Publisher: Wiley
Date: 30-06-2009
Virtual Petrographic Microscope: a multi-platform education and research software tool to analyse rock thin-sections
Publisher: Informa UK Limited
Date: 28-02-2014
Geochemical fingerprint of hyaloclasts in glassy fragmental rocks of Macquarie Island (Southern Ocean): implications for volcanogenic sedimentary processes at a waning mid-ocean ridge
Publisher: Informa UK Limited
Date: 10-2009
Patterns of strain localization in heterogeneous, polycrystalline rocks – a numerical perspective
Publisher: Elsevier BV
Date: 04-2017
Fingerprinting Proterozoic Bedrock in Interior Wilkes Land, East Antarctica
Publisher: Springer Science and Business Media LLC
Date: 15-07-2019
DOI: 10.1038/S41598-019-46612-Y
Abstract: Wilkes Land in East Antarctica remains one of the last geological exploration frontiers on Earth. Hidden beneath kilometres of ice, its bedrock preserves a poorly-understood tectonic history that mirrors that of southern Australia and holds critical insights into past supercontinent cycles. Here, we use new and recently published Australian and Antarctic geological and geophysical data to present a novel interpretation of the age and character of crystalline basement and sedimentary cover of interior Wilkes Land. We combine new zircon U–Pb and Hf isotopic data from remote Antarctic outcrops with aeromagnetic data observations from the conjugate Australian-Antarctic margins to identify two new Antarctic Mesoproterozoic basement provinces corresponding to the continuation of the Coompana and Madura provinces of southern Australia into Wilkes Land. Using both detrital zircon U–Pb–Hf and authigenic monazite U–Th–Pb isotopic data from glacial erratic sandstone s les, we identify the presence of Neoproterozoic sedimentary rocks covering Mesoproterozoic basement. Together, these new geological insights into the ice-covered bedrock of Wilkes Land substantially improve correlations of Antarctic and Australian geological elements and provide key constraints on the tectonic architecture of this sector of the East Antarctic Shield and its role in supercontinent reconstructions.
Orthopyroxene-omphacite- and garnet-omphacite-bearing magmatic assemblages, Breaksea Orthogneiss, New Zealand: Oxidation state controlled by high-P oxide fractionation
Publisher: Elsevier BV
Date: 02-2015
Tectonic drivers and the influence of the Kerguelen plume on seafloor spreading during formation of the early Indian Ocean
Publisher: Elsevier BV
Date: 07-2016
Local partial melting of the lower crust triggered by hydration through melt-rock interaction: an example from Fiordland, New Zealand
Publisher: Wiley
Date: 18-11-2016
DOI: 10.1111/JMG.12229
The recognition of former melt flux through high‐strain zones
Publisher: Wiley
Date: 25-06-2018
DOI: 10.1111/JMG.12427
Hydration, melt production and rheological weakening within an intracontinental gneiss dome
Publisher: Elsevier BV
Date: 12-2022
Strike-slip tectonics during the Neoproterozoic–Cambrian assembly of East Gondwana: Evidence from a newly discovered microcontinent in the Indian Ocean (Batavia Knoll)
Publisher: Elsevier BV
Date: 11-2017
Vitriclastic lithofacies from Macquarie Island (Southern Ocean): compositional influence on abyssal eruption explosivity in a dying Miocene spreading ridge
Publisher: Springer Science and Business Media LLC
Date: 18-08-2009
Zircon U‐Pb Dating of a Lower Crustal Shear Zone: A Case Study From the Northern Sector of the Ivrea‐Verbano Zone (Val Cannobina, Italy)
Publisher: American Geophysical Union (AGU)
Date: 2018
DOI: 10.1002/2017TC004638
Retrograde metamorphism of the Wongwibinda Complex, New England Fold Belt and the implications of 2.5D subsurface geophysical structure for the metamorphic history
Publisher: Informa UK Limited
Date: 04-2010
Eastern Indian Ocean microcontinent formation driven by plate motion changes
Publisher: Elsevier BV
Date: 11-2016
Thermal gradient and timing of high‐T–low‐P metamorphism in the Wongwibinda Metamorphic Complex, southern New England Orogen, Australia
Publisher: Wiley
Date: 20-06-2011
Mesoproterozoic Tasmania: Witness to the East Antarctica-Laurentia connection within Nuna: REPLY
Publisher: Geological Society of America
Date: 23-02-2016
DOI: 10.1130/G37740Y.1
A cryptic Gondwana-forming orogen located in Antarctica
Publisher: Springer Science and Business Media LLC
Date: 30-05-2018
DOI: 10.1038/S41598-018-26530-1
Abstract: The most poorly exposed and least understood Gondwana-forming orogen lies largely hidden beneath ice in East Antarctica. Called the Kuunga orogen, its interpolation between scattered outcrops is speculative with differing and often contradictory trends proposed, and no consensus on the location of any sutures. While some discount a suture altogether, paleomagnetic data from Indo-Antarctica and Australo-Antarctica do require 3000–5000 km relative displacement during Ediacaran-Cambrian Gondwana amalgamation, suggesting that the Kuunga orogen sutured provinces of broadly Indian versus Australian affinity. Here we use compiled data from detrital zircons offshore of East Antarctica that fingerprint two coastal subglacial basement provinces between 60 and 130°E, one of Indian affinity with dominant ca. 980–900 Ma ages (Indo-Antarctica) and one of Australian affinity with dominant ca. 1190–1140 and ca. 1560 Ma ages (Australo-Antarctica). We combine this offshore compilation with existing and new onshore U-Pb geochronology and previous geophysical interpretations to delimit the Indo-Australo-Antarctic boundary at a prominent geophysical lineament which intersects the coast east of Mirny at ~94°E.
Plutonic rocks of western Fiordland, New Zealand: Field relations, geochemistry, correlation, and nomenclature
Publisher: Informa UK Limited
Date: 12-2009
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