ORCID Profile
0000-0002-8257-7975
Current Organisation
University of Adelaide
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Mineralogy and Crystallography | Inorganic Geochemistry | Geophysics | Geology | Geochemistry not elsewhere classified | Geothermics and Radiometrics | Igneous and Metamorphic Petrology | Tectonics
Expanding Knowledge in the Earth Sciences | Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts) | Mineral Exploration not elsewhere classified |
Publisher: Elsevier BV
Date: 05-2018
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: Elsevier BV
Date: 10-2013
Publisher: Springer Netherlands
Date: 2011
Publisher: Petroleum Exploration Society of Australia (PESA)
Date: 30-08-2022
DOI: 10.36404/OVUF8939
Abstract: The greater McArthur Basin of the North Australian Craton is one of the very few places on Earth where extensive hydrocarbons are preserved that were generated from Mesoproterozoic source rocks, prior to the development of extensive multicellular life (e.g. Cox et al., 2022). It is, however, unclear precisely when hydrocarbons from these source rocks matured, and if this occurred as a singular event or multiple phases (e.g. Crick et al., 1988 Dutkiewicz et al., 2007). In this study we present new apatite fission track data from a combination of outcrop and sub-surface s les from the McArthur Basin (Figure 1) to investigate the post depositional thermal history of the basin, and explore the timing of potential hydrocarbon maturation.
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 07-2011
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 11-2011
Publisher: Elsevier BV
Date: 09-2017
Publisher: Springer Science and Business Media LLC
Date: 18-11-2022
Publisher: American Geophysical Union (AGU)
Date: 11-2019
DOI: 10.1029/2019GC008418
Publisher: Springer Science and Business Media LLC
Date: 26-10-2022
Publisher: American Geophysical Union (AGU)
Date: 06-2007
DOI: 10.1029/2006JB004664
Publisher: American Geophysical Union (AGU)
Date: 06-2007
DOI: 10.1029/2006JB004663
Publisher: Elsevier BV
Date: 04-2021
Publisher: Copernicus GmbH
Date: 17-10-2019
DOI: 10.5194/ESSD-11-1553-2019
Abstract: Abstract. Collation and dissemination of geochemical data are critical to promote rapid, creative, and accurate research and place new results in an appropriate global context. To this end, we have compiled a global whole-rock geochemical database, sourced from various existing databases and supplemented with an extensive list of in idual publications. Currently the database stands at 1 022 092 s les with varying amounts of associated s le data, including major and trace element concentrations, isotopic ratios, and location information. Spatial and temporal distribution is heterogeneous however, temporal distributions are enhanced over some previous database compilations, particularly in ages older than ∼ 1000 Ma. Also included are a range of geochemical indices, various naming schema, and physical property estimates computed on a major element normalized version of the geochemical data for quick reference. This compilation will be useful for geochemical studies requiring extensive data sets, in particular those wishing to investigate secular temporal trends. The addition of physical properties, estimated from s le chemistry, represents a unique contribution to otherwise similar geochemical databases. The data are published in .csv format for the purposes of simple distribution, but exist in a structure format acceptable for database management systems (e.g. SQL). One can either manipulate these data using conventional analysis tools such as MATLAB®, Microsoft® Excel, or R, or upload them to a relational database management system for easy querying and management of the data as unique keys already exist. The data set will continue to grow and be improved, and we encourage readers to contact us or other database compilations within about any data that are yet to be included. The data files described in this paper are available at 0.5281/zenodo.2592822 (Gard et al., 2019a).
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 11-2018
Publisher: Society of Exploration Geophysicists
Date: 2010
DOI: 10.1190/1.3513666
Publisher: Copernicus GmbH
Date: 17-04-2019
DOI: 10.5194/ESSD-2019-50
Abstract: Abstract. Dissemination and collation of geochemical data are critical to promote rapid, creative and accurate research and place new results in an appropriate global context. To this end, we have assembled a global whole-rock geochemical database, with other associated s le information and properties, sourced from various existing databases and supplemented with numerous in idual publications and corrections. Currently the database stands at 1,023,490 s les with varying amounts of associated information including major and trace element concentrations, isotopic ratios, and location data. The distribution both spatially and temporally is quite heterogeneous, however temporal distributions are enhanced over some previous database compilations, particularly in terms of ages older than ~ 1000 Ma. Also included are a wide range of computed geochemical indices, physical property estimates and naming schema on a major element normalized version of the geochemical data for quick reference. This compilation will be useful for geochemical studies requiring extensive data sets, in particular those wishing to investigate secular temporal trends. The addition of physical properties, estimated by s le chemistry, represents a unique contribution to otherwise similar geochemical databases. The data is published in .csv format for the purposes of simple distribution but exists in a format acceptable for database management systems (e.g. SQL). One can either manipulate this data using conventional analysis tools such as MATLAB®, Microsoft® Excel, or R, or upload to a relational database management system for easy querying and management of the data as unique keys already exist. This data set will continue to grow, and we encourage readers to contact us or other database compilations contained within about any data that is yet to be included. The data files described in this paper are available at 0.5281/zenodo.2592823 (Gard et al., 2019).
Publisher: Cambridge University Press (CUP)
Date: 04-2023
DOI: 10.1017/S0954102023000032
Abstract: Subglacial melt has important implications for ice-sheet dynamics. Locating and identifying subglacial lakes are expensive and time-consuming, requiring radar surveys or satellite methods. We explore three methods to identify source regions for lakes using seven continent-wide environmental characteristics that are sensitive to or influenced by ice-sheet temperature. A simple comparison of environmental properties at lake locations with their continent-wide distributions suggests a statistical relationship (high Kolmogorov-Smirnov statistic) between stable lake locations and ice thickness and surface temperatures, indicating melting under passive conditions. Active lakes, in contrast, show little correlation with direct thermally influenced parameters, instead exhibiting large statistical differences with horizontal velocity and bedrock elevation. More sophisticated techniques, including principal component analysis (PCA) and machine learning (ML) classification, provide better spatial identification of lake types. Positive PCA scores derived from the environmental characteristics correlate with stable lakes, whereas negative values correspond to active lakes. ML methods can also identify regions where subglacial lake melt sources are probable. While ML provides the most accurate classification maps, the combination of approaches adds deeper knowledge of the primary controls on lake formation and the environmental settings in which they are likely to be found.
Publisher: Elsevier BV
Date: 09-2020
Publisher: Elsevier BV
Date: 08-2022
Publisher: American Geophysical Union (AGU)
Date: 05-2008
DOI: 10.1029/2007GC001886
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 09-2016
Publisher: California Digital Library (CDL)
Date: 17-06-2022
DOI: 10.31223/X5TD1C
Abstract: Accurate spatial models of tectonic plates and geological terranes are important for analyzing and interpreting a wide variety of geoscientific data and developing compositional and physical models of the lithosphere. We present a global compilation of active plate boundaries and geological provinces in a shapefile format with interpretive attributes (e.g., crust type, plate type, province type, last orogeny). The initial plate and province boundaries are constructed from a combination of published global and regional models that we refine using a variety of geoscientific constraints including, but not limited to, relative GPS motions, earthquakes, mapped faults, potential field characteristics, and geochronology. These new plate model show improved correlation to observed earthquake and volcano occurrences within deformation zones and microplates, compared to existing models, capturing 73 and 80% of these criteria, respectively. Deformation zones and microplates only account for 16% of Earth's surface area. We estimate 57.5% of the Earth’s surface is covered by oceanic crust, which is a slight increase relative to the most recent seafloor age model. The model of last orogenies agrees well with peaks in the globally summed geochronology data. There is room for improvement in future editions of our global plate and geologic provinces model where basins, ice, or lack of geological data fidelity obscure bedrock geology, particularly in the eastern Central Asian Orogenic Belt, much of Africa, East Antarctica, and eastern Australia. Additionally, some province types—orogens, shields, and cratons that are homogenized within our global scheme—can likely be partitioned into smaller terranes with more precise geodynamic attributes. Despite some of these shortcomings, the digital maps presented here form a self-consistent data standard for adding spatial metadata to geoscientific databases. The database is available on GitHub where the geoscience community can provide updates to improve the models and their contemporaneity as new knowledge is acquired. The files are also released in formats suitable for use in Generic Mapping Tools and GoogleEarth.
Publisher: Wiley
Date: 18-09-2021
Publisher: Cambridge University Press (CUP)
Date: 12-05-2021
DOI: 10.1017/JOG.2021.38
Abstract: In this study, we explore small-scale (~1 to 20 km) thermal-refractive effects on basal geothermal heat flux (BGHF) at subglacial boundaries resulting from lateral thermal conductivity contrasts associated with subglacial topography and geologic contacts. We construct a series of two-dimensional, conductive, steady-state models that exclude many of the complexities of ice sheets in order to demonstrate the effect of thermal refraction. We show that heat can preferentially flow into or around a subglacial valley depending on the thermal conductivity contrast with underlying bedrock, with anomalies of local BGHF at the ice–bedrock interface between 80 and 120% of regional BGHF and temperature anomalies on the order of ±15% for the typical range of bedrock conductivities. In the absence of bed topography, subglacial contacts can produce significant heat flux and temperature anomalies that are locally extensive ( km). Thermal refraction can result in either an increase or decrease in the likelihood of melting and ice-sheet stability depending on the conductivity contrast and bed topography. While our models exclude many of the physical complexities of ice behavior, they illustrate the need to include refractive effects created by realistic geology into future glacial models to improve the prediction of subglacial melting and ice viscosity.
Publisher: Wiley
Date: 14-12-2021
Location: United States of America
Location: United States of America
Start Date: 02-2018
End Date: 06-2022
Amount: $248,048.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2016
End Date: 12-2020
Amount: $348,962.00
Funder: Australian Research Council
View Funded Activity