ORCID Profile
0000-0002-4992-8681
Current Organisations
University of Tasmania
,
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)
Geophysics | Geology | Oceanography | Inorganic Geochemistry | Sedimentology | Chemical Oceanography | Physical Oceanography | Glaciology | Geothermics and Radiometrics | Marine Geoscience | Tectonics | Climate Change Processes
ANZSRC Socio-Economic Objective (SEO)
Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts) | Expanding Knowledge in the Earth Sciences | Expanding Knowledge in the Environmental Sciences | Iron Ore Exploration | Precious (Noble) Metal Ore Exploration | Copper Ore Exploration |
Related Links
Publications
A Multivariate Approach for Mapping Lithospheric Domain Boundaries in East Antarctica
Publisher: American Geophysical Union (AGU)
Date: 09-2019
DOI: 10.1029/2019GL083453
Glaciological setting of the Queen Mary and Knox coasts, East Antarctica, over the past 60 years, and implied dynamic stability of the Shackleton system
Publisher: Copernicus GmbH
Date: 06-10-2021
DOI: 10.5194/TC-2021-265
Abstract: Abstract. The discovery of the deepest subglacial trough beneath the Denman Glacier, combined with high rates of basal melt at the grounding line, have caused significant concern over its vulnerability to retreat. Recent attention has therefore been focusing on understanding the governing dynamic controls, although knowledge of the wider regional context and timescales over which the future responses may occur remains poor. Here we consider the whole Shackleton system, comprising of the Shackleton ice shelf, Denman Glacier and adjacent Scott, Northcliffe, Roscoe and Apfel glaciers, about which almost nothing is known. We widen the context of previously observed dynamic changes in the Denman Glacier into the wider region of the Queen Mary and Knox coasts with a multi-decadal timeframe and an improved biannual temporal frequency of observations in the last seven years (2014–21). We integrate new satellite observations of ice structure, changes in ice front position and ice-flow velocities to investigate changes in the system. We furthermore use the BISICLES ice sheet model to assess the sensitivity and simulate the response times of the Queen Mary and Knox coasts to hypothetical disintegration of its floating ice areas, in response to coupled ocean and atmospheric forcing. Over the 60-year period of observation, the Queen Mary and Knox coasts do not appear to have changed significantly and higher frequency observations have not revealed any significant annual or sub-annual variations in ice flow. A previously observed increase in the ice flow speed of the Denman Glacier has not continued beyond 2008, and we cannot identify any related change in the surface structure of the system since then. We do, however, observe more significant change in the Scott Glacier, with an acceleration in ice flow associated with calving and progressing from the ice front along the floating tongue since early 2020. No changes in surface structure or ice flow speed are observed closer to the grounded ice. Our upper limit numerical simulations for a 400-year period are consistent with noticeable grounding line retreat in the Denman Glacier in the next two centuries if all floating ice were lost, before stabilising again in the third century from now. This equates to around 6 cm of sea level rise, a small contribution when compared to other areas of East Antarctica expected to change over the same time frame. It is clear that current knowledge is insufficient to explain the observed spatial and temporal changes in the dynamic behaviour of the grounded and floating sections in the Shackleton system. Given the potential vulnerability of the system to accelerating retreat better data recording the glaciological, oceanographic, and geological conditions in the Queen Mary and Knox coasts are required to improve the certainty of numerical model predictions. With access to these remote coastal regions a major challenge, coordinated internationally collaborative efforts are required to quantify how much the Queen Mary and Knox coastal region is likely contribute to sea level rise in the coming centuries.
The metamorphic sole of the western Tasmanian ophiolite: New insights into the Cambrian tectonic setting of the Gondwana Pacific margin
Publisher: Elsevier BV
Date: 10-2016
A 3D map of englacial attenuation rate from radar reflections at Law Dome, East Antarctica
Publisher: Copernicus GmbH
Date: 27-10-2020
Abstract: Abstract. The East Antarctic Ice Sheet (EAIS) is the largest source of potential sea-level rise, containing approximately 52 m of sea-level equivalent. To constrain estimates of sea-level rise into the future requires knowledge of ice-sheet properties and geometry and ice-penetrating radar offers a means to estimate these properties (e.g. ice thickness, englacial temperatures). One of the regions that have been extensively surveyed using ice-penetrating radar from the Investigating the Cryospheric Evolution of the Central Antarctic Plate (ICECAP) project in East Antarctica is Law Dome, a small independent ice cap situated to the west of Totten Ice Shelf. The ice cap is slow-moving, has a low melt-rate at the surface and moderate wind speeds, making it a useful study site for estimating the radar attenuation. A new method is proposed for the estimation of attenuation rate from radar data which is mathematically modelled as a constrained regularised l2 minimisation problem. In the proposed method, only radar data is required and the englacial reflectors are automatically detected from the radar data itself. To validate our methodology, attenuation differences at flight crossover points are calculated and statistical analyses performed to assess the accuracy of the results. For spatial analyses, the errors are of the order 22.6 %, 15.2 %, and 32.8 % for mean absolute error, median absolute error, and root mean square error respectively. Also, for the depth analyses, up to the depth of 800 m, the errors are under 29.9 %, 24.2 %, and 38.8 % for mean absolute error, median absolute error, and root mean square error respectively. A final product of 3D attenuation rates and uncertainty estimates is provided. The generated dataset is publicly available at 0.25959/5e6851e266f4a (Abdul Salam, 2020).
Severe Selenium depletion in the Phanerozoic oceans as a factor in three global mass extinction events
Publisher: Elsevier BV
Date: 08-2016
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
Evidence for melt migration enhancing recrystallization of metastable assemblages in mafic lower crust, Fiordland, New Zealand
Publisher: Wiley
Date: 02-2009
Pangea Rifting Shaped the East Antarctic Landscape
Publisher: American Geophysical Union (AGU)
Date: 08-2020
DOI: 10.1029/2020TC006180
Fine‐Scale Geothermal Heat Flow in Antarctica Can Increase Simulated Subglacial Melt Estimates
Publisher: American Geophysical Union (AGU)
Date: 14-08-2022
DOI: 10.1029/2022GL098539
Abstract: Antarctic geothermal heat flow (GHF) affects the thermal regime of ice sheets and simulations of ice and subglacial meltwater discharge to the ocean, but remains poorly constrained. We use an ice sheet model to investigate the impact of GHF anomalies on subglacial meltwater production in the Aurora Subglacial Basin, East Antarctica. We find that spatially‐variable GHF fields produce more meltwater than a constant GHF with the same background mean, and meltwater production increases as the resolution of GHF anomalies increases. Our results suggest that model simulations of this region systematically underestimate meltwater production using current GHF models. We determine the minimum basal heating required to bring the basal ice temperature to the pressure melting point, which should be taken together with the scale‐length of likely local variability in targeting in‐situ GHF field c aigns.
Authigenic monazite and detrital zircon dating from the Proterozoic Rocky Cape Group, Tasmania: Links to the Belt-Purcell Supergroup, North America
Publisher: Elsevier BV
Date: 09-2014
The Proterozoic P-T-t evolution of the Kemp Land Coast, East Antarctica; constraints from Si-saturated and Si-undersaturated metapelites
Publisher: Oxford University Press (OUP)
Date: 07-2007
Contrasting P-T-t paths for Neoproterozoic metamorphism in MacRobertson and Kemp Lands, east Antarctica
Publisher: Wiley
Date: 21-07-2007
Trace Element Content of Sedimentary Pyrite in Black Shales
Publisher: Society of Economic Geologists
Date: 13-07-2015
Heat Flow in Southern Australia and Connections With East Antarctica
Publisher: American Geophysical Union (AGU)
Date: 11-2019
DOI: 10.1029/2019GC008418
Antarctic geothermal heat flow and its implications for tectonics and ice sheets
Publisher: Springer Science and Business Media LLC
Date: 26-10-2022
L – Goldschmidt Abstracts 2013
Publisher: Mineralogical Society
Date: 07-2013
Insights from the spatial variability of (multiple) uncertainties: Earth-ice interactions for East Antarctica
Publisher: Copernicus GmbH
Date: 15-05-2023
DOI: 10.5194/EGUSPHERE-EGU23-1524
Abstract: Uncertainty, as applied to geophysical and multivariate initiatives to constrain aspects of Earth-ice interactions for East Antarctica, provides a number of approaches to appraise and interrogate research results.& We discuss a number of use cases: 1) making use of multiple uncertainty metrics 2) making comparisons between spatially variable maps of inferred properties such as geothermal heat flow 3) extrapolating crustal structure given the likelihood of tectonic boundaries and 4) providing research results for interdisciplinary studies in forms that facilitate ensemble approaches.& It proves extremely useful to assess a research finding, such as a mapped geophysical property, through multiple uncertainty metrics (e.g., standard deviation, information entropy, data count).& However, a thoughtful appraisal of multiple metrics could be misleading, i.e., potentially not useful in isolation, in a case where there are significant unquantified uncertainties.& Uncertainties supplied with the mapped geophysical properties can potentially be extended to capture this broader range, but that range in turn could become less helpful as the fine detail in the quantified uncertainty will be lost.& In the case of a property such as geothermal heat flow, indirectly determined for East Antarctica, insights can be drawn by subtracting a forward model map from an empirically determined result (e.g. Aq1) to yield the non-steady state components excluded in the forward model.& In such investigations, including the maximum and minimum possible difference between maps is essential to understand which non-steady state anomalies are real, and which could be artifacts attributable to (quantified) uncertainty.& In further use cases, we show how the few available seismic measurements that constrain the crust and upper mantle structure of East Antarctica can be placed in context, given the likelihood of major tectonic boundaries beneath the ice, and link this to published constraints on the seismic structure (and hence, rheology) of the deeper lithosphere.& In terms of how the solid Earth interacts with the ice sheet above, the impact of fine scale-length variations in spatial uncertainty may be investigated in relation to, for ex le, ice sheet modelling. For a large region and relatively unexplored region such as East Antarctica, uncertainty yields many and varied insights.&
Inferring geothermal heat flux from an ice-borehole temperature profile at Law Dome, East Antarctica
Publisher: Cambridge University Press (CUP)
Date: 22-04-2020
DOI: 10.1017/JOG.2020.27
Abstract: Geothermal heat flux (GHF) is an important control on the dynamics of Antarctica's ice sheet because it controls basal melt and internal deformation. However, it is hard to estimate because of a lack of in-situ measurements. Estimating GHF from ice-borehole temperature profiles is possible by combining a heat-transfer equation and the physical properties of the ice sheet in a numerical model. In this study, we truncate ice-borehole temperature profiles to determine the minimum ratio of temperature profile depth to ice-sheet thickness required to produce acceptable GHF estimations. For Law Dome, a temperature profile that is within 60% of the local ice thickness is sufficient for an estimation that is within approximately one median absolute deviation of the whole-profile GHF estimation. This result is compared with the temperature profiles at Dome Fuji and the West Antarctic Ice Sheet ide which require a temperature profile that is 80% and more than 91% of the ice thickness, respectively, for comparable accuracy. In deriving GHF median estimations from truncated temperature profiles, it is possible to discriminate between available GHF models. This is valuable for assessing and constraining future GHF models.
Depositional age and correlation of the Oonah Formation: refining the timing of Neoproterozoic basin formation in Tasmania
Publisher: Informa UK Limited
Date: 15-02-2018
Scratching the Surface: A Marine Sediment Provenance Record From the Continental Slope of Central Wilkes Land, East Antarctica
Publisher: American Geophysical Union (AGU)
Date: 11-2020
DOI: 10.1029/2020GC009156
Gold in the oceans through time
Publisher: Elsevier BV
Date: 10-2015
H – Goldschmidt Abstracts 2013
Publisher: Mineralogical Society
Date: 07-2013
U–Pb zircon geochronology and geochemistry from NE Vietnam: A ‘tectonically disputed’ territory between the Indochina and South China blocks
Publisher: Elsevier BV
Date: 06-2016
In-situ U-Pb geochronology and Hf isotope analyses of the Rayner Complex, east Antarctica
Publisher: Springer Science and Business Media LLC
Date: 27-11-2005
Australian-Antarctic breakup and seafloor spreading: Balancing geological and geophysical constraints
Publisher: Elsevier BV
Date: 2019
Trace element content of sedimentary pyrite as a new proxy for deep-time ocean–atmosphere evolution
Publisher: Elsevier BV
Date: 03-2014
Glaciological history and structural evolution of the Shackleton Ice Shelf system, East Antarctica, over the past 60 years
Publisher: Copernicus GmbH
Date: 16-01-2023
Abstract: Abstract. The discovery of Antarctica's deepest subglacial trough beneath the Denman Glacier, combined with high rates of basal melt at the grounding line, has caused significant concern over its vulnerability to retreat. Recent attention has therefore been focusing on understanding the controls driving Denman Glacier's dynamic evolution. Here we consider the Shackleton system, comprised of the Shackleton Ice Shelf, Denman Glacier, and the adjacent Scott, Northcliff, Roscoe and Apfel glaciers, about which almost nothing is known. We widen the context of previously observed dynamic changes in the Denman Glacier to the wider region of the Shackleton system, with a multi-decadal time frame and an improved biannual temporal frequency of observations in the last 7 years (2015–2022). We integrate new satellite observations of ice structure and airborne radar data with changes in ice front position and ice flow velocities to investigate changes in the system. Over the 60-year period of observation we find significant rift propagation on the Shackleton Ice Shelf and Scott Glacier and notable structural changes in the floating shear margins between the ice shelf and the outlet glaciers, as well as features indicative of ice with elevated salt concentration and brine infiltration in regions of the system. Over the period 2017–2022 we observe a significant increase in ice flow speed (up to 50 %) on the floating part of Scott Glacier, coincident with small-scale calving and rift propagation close to the ice front. We do not observe any seasonal variation or significant change in ice flow speed across the rest of the Shackleton system. Given the potential vulnerability of the system to accelerating retreat into the overdeepened, potentially sediment-filled bedrock trough, an improved understanding of the glaciological, oceanographic and geological conditions in the Shackleton system are required to improve the certainty of numerical model predictions, and we identify a number of priorities for future research. With access to these remote coastal regions a major challenge, coordinated internationally collaborative efforts are required to quantify how much the Shackleton region is likely to contribute to sea level rise in the coming centuries.
The Western Ailaoshan Volcanic Belts and their SE Asia connection: A new tectonic model for the Eastern Indochina Block
Publisher: Elsevier BV
Date: 07-2014
The Central Ailaoshan ophiolite and modern analogs
Publisher: Elsevier BV
Date: 07-2014
The Tam Ky-Phuoc Son Shear Zone in central Vietnam: Tectonic and metallogenic implications
Publisher: Elsevier BV
Date: 07-2014
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
Timing and style of high-temperature metamorphism across the Western Gawler Craton during the Paleo- to Mesoproterozoic
Publisher: Informa UK Limited
Date: 04-06-2019
PetroChron Antarctica: a Geological Database for Interdisciplinary Use
Publisher: Wiley
Date: 18-09-2021
Using information entropy to optimise and communicate certainty of continental scale tectonic models
Publisher: Copernicus GmbH
Date: 15-05-2023
DOI: 10.5194/EGUSPHERE-EGU23-4074
Abstract: Antarctic subglacial properties impact geothermal heat, subglacial sedimentation, and glacial isostatic adjustment critical parameters for predicting the ice sheet's response to warming oceans. However, the tectonic architecture of the Antarctic interior is unresolved, with results dependent on datasets or extrapolation used. Most existing deterministic suggestions are derived from qualitative observations and often presented as robust results however, they hide possible alternative interpretations.& Using information entropy as a measure of certainty, we present a robust tectonic segmentation model generated from similarity analysis of multiple geophysical and geological datasets. The use of information entropy provides us with an unbiased and transparent metric to communicate the ambiguities from the uncertainties of qualitative classifications. Information theory also allows us to test and optimise the methods and data to evaluate how choices impact the distribution of alternative output maps. We further discuss how this metric can quantify the predictive power of parameters as a function of regions with different tectonic settings.
A new heat flux model for the Antarctic Peninsula incorporating spatially variable upper crustal radiogenic heat production
Publisher: American Geophysical Union (AGU)
Date: 12-06-2017
DOI: 10.1002/2017GL073596
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.
PetroChron Antarctica: a geological database for interdisciplinary use
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.
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
Author Correction: Antarctic geothermal heat flow and its implications for tectonics and ice sheets
Publisher: Springer Science and Business Media LLC
Date: 18-11-2022
The chemical conditions of the late Archean Hamersley basin inferred from whole rock and pyrite geochemistry with δ33S and δ34S isotope analyses
Publisher: Elsevier BV
Date: 2015
Rodinian devil in disguise: Correlation of 1.25–1.10 Ga strata between Tasmania and Grand Canyon
Publisher: Geological Society of America
Date: 08-10-2018
DOI: 10.1130/G45225.1
Cycles of nutrient trace elements in the Phanerozoic ocean
Publisher: Elsevier BV
Date: 12-2015
RELEASE OF TRACE ELEMENTS THROUGH THE SUB-GREENSCHIST FACIES BREAKDOWN OF DETRITAL RUTILE TO METAMORPHIC TITANITE IN THE OTAGO SCHIST, NEW ZEALAND
Publisher: Mineralogical Association of Canada
Date: 05-2015
Antarctic Geothermal Heat Flow Model: Aq1
Publisher: American Geophysical Union (AGU)
Date: 02-2021
DOI: 10.1029/2020GC009428
Abstract: We present a refined map of geothermal heat flow for Antarctica, Aq1, based on multiple observables. The map is generated using a similarity detection approach by attributing observables from geophysics and geology to a large number of high‐quality heat flow values ( N = 5,792) from other continents. Observables from global, continental, and regional datasets for Antarctica are used with a weighting function that allows the degree of similarity to increase with proximity and how similar the observables are. The similarity detection parameters are optimized through cross correlation. For each grid cell in Antarctica, a weighted average heat flow value and uncertainty metrics are calculated. The Aq1 model provides higher spatial resolution in comparison to previous results. High heat flow is shown in the Thwaites Glacier region, with local values over 150 mW m −2 . We also map elevated values over 80 mW m −2 in Palmer Land, Marie Byrd Land, Victoria Land and Queen Mary Land. Very low heat flow is shown in the interior of Wilkes Land and Coats Land, with values under 40 mW m −2 . We anticipate that the new geothermal heat flow map, Aq1, and its uncertainty bounds will find extended use in providing boundary conditions for ice sheet modeling and understanding the interactions between the cryosphere and solid Earth. The computational framework and open architecture allow for the model to be reproduced, adapted and updated with additional data, or model subsets to be output at higher resolution for regional studies.
Discovery of a microcontinent (Gulden Draak Knoll) offshore Western Australia: Implications for East Gondwana reconstructions
Publisher: Elsevier BV
Date: 10-2015
THE MESOPROTEROZOIC SEDIMENTARY RECORD OF LONG-TERM AUSTRALIAN/ ANTARCTIC, LAURENTIAN CONNECTIONS
Publisher: Geological Society of America
Date: 2016
Structural Configuration of the Central African Copperbelt: Roles of Evaporites in Structural Evolution, Basin Hydrology, and Ore Location
Publisher: Society of Economic Geologists (SEG)
Date: 2018
DOI: 10.5382/SP.21.07
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
The configuration of Greater Gondwana—Evidence from LA ICPMS, U–Pb geochronology of detrital zircons from the Palaeozoic and Mesozoic of Southeast Asia and China
Publisher: Elsevier BV
Date: 07-2014
Naturaliste Plateau: constraints on the timing and evolution of the Kerguelen Large Igneous Province and its role in Gondwana breakup
Publisher: Informa UK Limited
Date: 03-10-2017
Properties and biases of the global heat flow compilation
Publisher: Frontiers Media SA
Date: 17-08-2022
DOI: 10.3389/FEART.2022.963525
Abstract: Geothermal heat flow is inferred from the gradient of temperature values in boreholes or short-penetration probe measurements. Such measurements are expensive and logistically challenging in remote locations and, therefore, often targeted to regions of economic interest. As a result, measurements are not distributed evenly. Some tectonic, geologic and even topographic settings are overrepresented in global heat flow compilations other settings are underrepresented or completely missing. These limitations in representation have implications for empirical heat flow models that use catalogue data to assign heat flow by the similarity of observables. In this contribution, we analyse the s ling bias in the Global Heat Flow database of the International Heat Flow Commission the most recent and extensive heat flow catalogue, and discuss the implications for accurate prediction and global appraisals. We also suggest correction weights to reduce the bias when the catalogue is used for empirical modelling. From comparison with auxiliary variables, we find that each of the following settings is highly overrepresented for heat flow measurements continental crust, sedimentary rocks, volcanic rocks, and Phanerozoic regions with hydrocarbon exploration. Oceanic crust, cratons, and metamorphic rocks are underrepresented. The findings also suggest a general tendency to measure heat flow in areas where the values are elevated however, this conclusion depends on which auxiliary variable is under consideration to determine the settings. We anticipate that using our correction weights to balance disproportional representation will improve empirical heat flow models for remote regions and assist in the ongoing assessment of the Global Heat Flow database.
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.
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
Naturaliste Plateau, offshore western Australia: A submarine window into Gondwana assembly and breakup
Publisher: Geological Society of America
Date: 2008
DOI: 10.1130/G25059A.1
Spatially‐focussed melt formation in aluminous metapelites from Broken Hill, Australia
Publisher: Wiley
Date: 12-2004
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
Eastern Indian Ocean microcontinent formation driven by plate motion changes
Publisher: Elsevier BV
Date: 11-2016
Earliest Paleoproterozoic high-grade metamorphism and orogenesis in the Gawler Craton, South Australia: The southern cousin in the Rae family?
Publisher: Elsevier BV
Date: 05-2016
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.
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