ORCID Profile
0000-0002-8364-9168
Current Organisations
Australian National University
,
UNSW Sydney
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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.
Geology | Mineralogy and Crystallography | Volcanology | Ore Deposit Petrology | Geochemistry | Environmental Chemistry (incl. Atmospheric Chemistry) | Archaeological Science | Inorganic Geochemistry | Isotope Geochemistry | Extraterrestrial Geology
Expanding Knowledge in the Earth Sciences | Mineral Exploration not elsewhere classified | Mineral Resources (excl. Energy Resources) not elsewhere classified | Oil and Gas Extraction | Climate and Climate Change not elsewhere classified | Natural Hazards not elsewhere classified | Understanding Australia's Past | Scientific Instruments | Copper Ore Exploration |
Publisher: American Geophysical Union (AGU)
Date: 09-2014
DOI: 10.1002/2013JE004590
Publisher: Mineralogical Society of America
Date: 11-2009
DOI: 10.2138/AM.2009.3113
Publisher: Elsevier
Date: 2019
Publisher: Elsevier BV
Date: 02-2016
Publisher: Mineralogical Society of America
Date: 11-2011
DOI: 10.2138/AM.2011.3792
Publisher: Elsevier BV
Date: 02-2017
Publisher: Mineralogical Society of America
Date: 11-2018
Publisher: MDPI AG
Date: 17-10-2022
DOI: 10.3390/STATS5040056
Abstract: The Cochran-Mantel-Haenszel (CMH) and nonparametric analysis of variance (NP ANOVA) methodologies are both sets of tests for categorical response data. The latter are competitor tests for the ordinal CMH tests in which the response variable is necessarily ordinal the treatment variable may be either ordinal or nominal. The CMH mean score test seeks to detect mean treatment differences, while the CMH correlation test assesses ordinary or (1, 1) generalized correlation. Since the corresponding nonparametric ANOVA tests assess arbitrary univariate and bivariate moments, the ordinal CMH tests have been extended to enable a fuller comparison. The CMH tests are conditional tests, assuming that certain marginal totals in the data table are known. They have been extended to have unconditional analogues. The NP ANOVA tests are unconditional. Here, we give a brief overview of both methodologies to address the question “which methodology is preferable?”.
Publisher: Mineralogical Society of America
Date: 11-2018
Publisher: Mineralogical Society of America
Date: 11-2018
Publisher: Mineralogical Society of America
Date: 08-2008
DOI: 10.2138/AM.2008.2777
Publisher: Mineralogical Society of America
Date: 11-2018
Publisher: American Geophysical Union (AGU)
Date: 11-2013
DOI: 10.1002/2013JE004435
Publisher: Elsevier BV
Date: 06-2017
Publisher: Mineralogical Society of America
Date: 11-2018
Publisher: American Geophysical Union (AGU)
Date: 20-07-2010
DOI: 10.1029/2009JE003452
Publisher: Elsevier BV
Date: 12-2004
Publisher: Elsevier BV
Date: 11-2012
Publisher: Informa UK Limited
Date: 08-2001
Publisher: Wiley
Date: 03-2022
DOI: 10.1111/ANZS.12361
Abstract: We focus on regression models that consist of (i) a model for the conditional mean of the outcome and (ii) a distributional assumption about the distribution of the outcome, both conditional on the regressors. Generalised linear models form a well‐known ex le. The choice of the outcome distribution is often motivated by prior or background knowledge of the researcher, or it is simply chosen for convenience. We propose smooth goodness of fit tests for testing the distributional assumption in regression models. The tests arise from embedding the regression model in a smooth family of alternatives, and constructing appropriate score tests that correctly account for nuisance parameter estimation. The tests are customised, focussed and comprehensive. We present several ex les to illustrate the wide applicability of our method. A small simulation study demonstrates that our tests have power to detect important deviations from the hypothesised model.
Publisher: American Geophysical Union (AGU)
Date: 09-01-2016
DOI: 10.1002/2015GL066675
Publisher: Springer Science and Business Media LLC
Date: 10-02-2020
DOI: 10.1038/S41598-020-58216-Y
Abstract: Sulphur dioxide (SO 2 ) is removed from flue gases prior to discharge into the atmosphere by high temperature sulphation reactions with the mineral calcite (CaCO 3 ) in the form of calcite aggregates such as limestone. The efficiency of this industrial-scale process is constrained by the self-inhibiting growth of anhydrite (CaSO 4 ) along calcite grain boundaries. Using very high resolution X-ray μCT and Scanning Electron Microscopy we show, for the first time, how the sulphation reaction is initiated by the anisotropic thermal expansion of calcite grains to produce high inter-grain permeability. In turn fast gas-solid reaction occurs to produce a network of porous anhydrite layers between grains. In idual calcite grains are then free to rotate and translate with respect to each other as the sulphation reaction proceeds. Grain translations of up to 24 μm and rotations of up to 0.64 degrees have been tracked in s les of a highly compacted calcite aggregate (Carrara Marble) across up to 600,000 grains through heating and cooling cycles during exposure to SO 2 gas flow at temperatures from 600 to 750 °C at one atmosphere. Such grain kinematics help to maintain gas phase permeability in the solid reactant and mitigate the inhibitory growth of porous anhydrite on grain boundaries.
Publisher: Elsevier BV
Date: 09-2007
Publisher: Mineralogical Society of America
Date: 11-2018
Publisher: Wiley
Date: 09-06-2020
Publisher: Elsevier BV
Date: 06-2015
Publisher: Springer Science and Business Media LLC
Date: 13-12-2019
Publisher: Elsevier BV
Date: 02-2010
Publisher: Mineralogical Association of Canada
Date: 10-2005
Publisher: Mineralogical Society of America
Date: 23-12-2014
DOI: 10.2138/AM-2015-4762
Publisher: Elsevier BV
Date: 05-2013
Publisher: American Geophysical Union (AGU)
Date: 2014
DOI: 10.1002/2013JE004481
Publisher: Mineralogical Society of America
Date: 11-2006
DOI: 10.2138/AM.2006.2075
Publisher: American Geophysical Union (AGU)
Date: 10-2019
DOI: 10.1029/2019JE006045
Publisher: Elsevier BV
Date: 12-2006
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 2013
Publisher: American Association for the Advancement of Science (AAAS)
Date: 24-01-2014
Abstract: Sedimentary rocks examined by the Curiosity rover at Yellowknife Bay, Mars, were derived from sources that evolved from an approximately average martian crustal composition to one influenced by alkaline basalts. No evidence of chemical weathering is preserved, indicating arid, possibly cold, paleoclimates and rapid erosion and deposition. The absence of predicted geochemical variations indicates that magnetite and phyllosilicates formed by diagenesis under low-temperature, circumneutral pH, rock-dominated aqueous conditions. Analyses of diagenetic features (including concretions, raised ridges, and fractures) at high spatial resolution indicate that they are composed of iron- and halogen-rich components, magnesium-iron-chlorine–rich components, and hydrated calcium sulfates, respectively. Composition of a cross-cutting dike-like feature is consistent with sedimentary intrusion. The geochemistry of these sedimentary rocks provides further evidence for erse depositional and diagenetic sedimentary environments during the early history of Mars.
Publisher: Mary Ann Liebert Inc
Date: 09-2019
Publisher: Mary Ann Liebert Inc
Date: 03-2012
Publisher: Elsevier BV
Date: 03-2010
Publisher: Mineralogical Society of America
Date: 04-2015
Publisher: Springer Science and Business Media LLC
Date: 04-12-2018
Publisher: American Association for the Advancement of Science (AAAS)
Date: 27-09-2013
Abstract: “Jake_M,” the first rock analyzed by the Alpha Particle X-ray Spectrometer instrument on the Curiosity rover, differs substantially in chemical composition from other known martian igneous rocks: It is alkaline ( % normative nepheline) and relatively fractionated. Jake_M is compositionally similar to terrestrial mugearites, a rock type typically found at ocean islands and continental rifts. By analogy with these comparable terrestrial rocks, Jake_M could have been produced by extensive fractional crystallization of a primary alkaline or transitional magma at elevated pressure, with or without elevated water contents. The discovery of Jake_M suggests that alkaline magmas may be more abundant on Mars than on Earth and that Curiosity could encounter even more fractionated alkaline rocks (for ex le, phonolites and trachytes).
Publisher: American Geophysical Union (AGU)
Date: 2005
DOI: 10.1029/2005JE002482
Publisher: American Geophysical Union (AGU)
Date: 02-06-2010
DOI: 10.1029/2009JB006672
Publisher: American Geophysical Union (AGU)
Date: 05-2013
DOI: 10.1002/JGRB.50197
Publisher: American Geophysical Union (AGU)
Date: 05-2014
DOI: 10.1002/2013JE004519
Publisher: American Geophysical Union (AGU)
Date: 2014
DOI: 10.1002/2013JE004517
Publisher: Elsevier BV
Date: 07-2023
Publisher: Springer Science and Business Media LLC
Date: 05-04-2012
Publisher: Mineralogical Society of America
Date: 20-12-2013
DOI: 10.2138/AM.2013.3959
Publisher: Springer Science and Business Media LLC
Date: 23-01-2016
Publisher: American Geophysical Union (AGU)
Date: 20-10-2007
DOI: 10.1029/2007GL031267
Publisher: Elsevier BV
Date: 12-2011
Publisher: Mineralogical Society of America
Date: 04-2010
Publisher: Elsevier BV
Date: 08-2006
Publisher: Mineralogical Society of America
Date: 05-2008
DOI: 10.2138/AM.2008.2757
Publisher: American Geophysical Union (AGU)
Date: 10-2013
DOI: 10.1002/GGGE.20255
Publisher: Elsevier BV
Date: 06-2008
Publisher: American Geophysical Union (AGU)
Date: 10-01-2007
DOI: 10.1029/2006GL027893
Publisher: American Geophysical Union (AGU)
Date: 12-2020
DOI: 10.1029/2020JE006536
Abstract: The Alpha Particle X‐ray Spectrometer (APXS) on the rover Curiosity has analyzed the composition of geologic materials along a ‐km traverse in Gale crater on Mars. The APXS dataset after 6.5 Earth years (2,301 sols) includes 712 analyses of soil, sand, float, bedrock, and drilled/scooped fines. We present the APXS results over this duration and provide stratigraphic context for each target. We identify the best APXS measurement of each of the 22 drilled and scooped s les that were delivered to the instruments Chemistry and Mineralogy (CheMin X‐ray diffractometer) and S le Analysis at Mars (SAM mass spectrometer and gas chromatograph) during this period. The APXS results demonstrate that the basaltic and alkali‐rich units in the Bradbury group (sols 0–750) show minimal alteration indicating an arid climate. In contrast, the Murray formation of the Mount Sharp group (sols ∼750–2,301) has compositions indicating pervasive alteration. Diagenetic features are common and show fluid interaction with the sediment after (and possibly during) lithification. A sandstone unit, the Stimson formation, overlies part of the Murray formation. This has a composition similar to the basaltic sand and soil, suggesting a shared source. Cross‐cutting, fracture‐associated haloes are evidence of late‐stage fluid alteration after lithification of the sediment. The APXS dataset, evaluated in concert with the full science payload of Curiosity , indicates that Gale crater was habitable, and that liquid water was stable for extended periods.
Publisher: Elsevier BV
Date: 03-2015
Publisher: Mineralogical Society of America
Date: 07-2013
DOI: 10.2138/AM.2013.4277
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 05-2008
Publisher: Elsevier BV
Date: 03-2002
Publisher: Elsevier BV
Date: 03-2014
Publisher: Springer Science and Business Media LLC
Date: 08-06-2021
Publisher: Mineralogical Society of America
Date: 2002
DOI: 10.2138/AM-2002-0115
Publisher: Springer Science and Business Media LLC
Date: 26-10-2018
Publisher: Wiley
Date: 05-01-2022
Publisher: Elsevier BV
Date: 07-2003
Publisher: Springer Science and Business Media LLC
Date: 27-02-2015
DOI: 10.1038/NGEO2367
Publisher: IEEE
Date: 03-2019
Publisher: American Association for the Advancement of Science (AAAS)
Date: 21-02-2014
Publisher: Elsevier BV
Date: 05-2002
Publisher: Elsevier BV
Date: 03-2023
Publisher: Springer Science and Business Media LLC
Date: 22-11-2017
Publisher: Springer Science and Business Media LLC
Date: 26-11-1996
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 05-2000
Publisher: Springer Science and Business Media LLC
Date: 17-02-2016
Publisher: American Geophysical Union (AGU)
Date: 06-2019
DOI: 10.1029/2018JE005911
Publisher: American Geophysical Union (AGU)
Date: 04-2015
DOI: 10.1002/2014JB011712
Publisher: Geological Society of America
Date: 07-2014
DOI: 10.1130/G35484.1
Publisher: Mineralogical Society of America
Date: 08-2018
DOI: 10.2138/AM-2018-6319
Publisher: Elsevier BV
Date: 04-2010
Publisher: American Geophysical Union (AGU)
Date: 10-2022
DOI: 10.1029/2021JE007171
Abstract: In Gale crater on Mars, the rover Curiosity has discovered evidence of fluid mobilization of the redox‐sensitive element manganese. We present results for Mn from Curiosity 's Alpha Particle X‐ray Spectrometer (APXS), which show that the average MnO concentration in mudstone‐dominated sedimentary units (0.22 wt%) is about one‐half of the concentration in the average Mars crust (0.44 wt%). Geochemical trends indicate that Mn in the sedimentary bedrock, most of which has a basaltic provenance, was leached by chemical alteration and dissolution. In vertical meters of mudstone‐dominated strata, the apparent leaching of Mn and retention of Fe in Fe‐O‐H phase(s) resulted in the fractionation of Fe and Mn, indicating relatively moderate Eh‐pH fluid conditions that were not highly alkaline, reducing, or oxidizing. Exceptions are fracture‐associated, silica‐rich haloes where both Mn and Fe were leached by low pH fluids. The rover also discovered Mn‐rich veins, nodules, and patchy, dark coatings on rock surfaces, which are variably associated with enrichments in Fe, P, Cl, and/or Zn. These Mn‐rich features represent ∼1% of the 1029 APXS measurements acquired over ∼25 km of rover traverse. A thermochemical model shows that dissolved Mn 2+ could have been concentrated via evaporation, sublimation, and/or freezing. Manganese was then likely precipitated in localized features when .99% of the Mn 2+ ‐bearing water was removed from the system. These findings indicate that Mn was mobile in Gale crater and therefore bioavailable as a potential energy source for life.
Publisher: Public Library of Science (PLoS)
Date: 30-04-2020
Publisher: American Geophysical Union (AGU)
Date: 26-08-2019
DOI: 10.1029/2019GL083800
Publisher: Springer Science and Business Media LLC
Date: 10-11-2020
Location: Iran (Islamic Republic of)
Start Date: 07-2022
End Date: 06-2024
Amount: $344,864.00
Funder: Australian Research Council
View Funded ActivityStart Date: 05-2015
End Date: 04-2019
Amount: $287,500.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2020
End Date: 12-2024
Amount: $497,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 05-2014
End Date: 04-2018
Amount: $755,042.00
Funder: Australian Research Council
View Funded Activity