ORCID Profile
0000-0003-3286-4682
Current Organisations
Flinders University
,
University of California, Berkeley
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Natural hazards | Sedimentology | Volcanology | Geology
Publisher: American Geophysical Union (AGU)
Date: 12-2015
DOI: 10.1002/2015JB012061
Publisher: Annual Reviews
Date: 30-05-2014
DOI: 10.1146/ANNUREV-EARTH-060313-055016
Abstract: Several features of Earth owe their origin to processes occurring during and shortly following Earth formation. Collisions with planetary embryos caused substantial melting of the growing Earth, leading to prolonged core formation, atmosphere outgassing, and deepening of the magma ocean as Earth grew. Mantle noble gas isotopic compositions and the mantle abundance of elements that partition into the core record this very early Earth differentiation. In contrast, the elements that are not involved in either core or atmosphere formation show surprisingly muted evidence of the fractionation expected during magma ocean crystallization, and even this minimal evidence for early intramantle differentiation appears to have been erased by mantle convection within ∼1.5 billion years of Earth formation. By 4.36 Ga, Earth's surface and shallow interior had reached temperatures similar to those of the present Earth, and mantle melting, and perhaps plate subduction, was producing crustal rock types similar to those seen today. Remnants of early Earth differentiation may still exist in the deep mantle and continue to influence patterns of large-scale mantle convection, sequestration of some trace elements, geomagnetic reversals, vertical motions of continents, and hot-spot volcanism.
Publisher: American Geophysical Union (AGU)
Date: 08-2012
DOI: 10.1029/2012GC004260
Publisher: Elsevier BV
Date: 2018
DOI: 10.1016/J.JENVMAN.2017.09.077
Abstract: The objective of this review is to highlight the need for further investigation of microbial toxicity caused by desorption of surfactant from Surfactant Modified Zeolite (SMZ). SMZ is a low cost, versatile permeable reactive media which has the potential to treat multiple classes of contaminants. With this combination of characteristics, SMZ has significant potential to enhance water and wastewater treatment processes. Surfactant desorption has been identified as a potential issue for the ongoing usability of SMZ. Few studies have investigated the toxicity of surfactants used in zeolite modification towards microorganisms and fewer have drawn linkages between surfactant desorption and surfactant toxicity. This review provides an overview of natural zeolite chemistry, characteristics and practical applications. The chemistry of commonly used surfactants is outlined, along with the kinetics that drive their adsorption to the zeolite surface. Methodologies to characterise this surfactant loading are also described. Applications of SMZ in water remediation are highlighted, giving focus to applications which deal with biological pollutants and where microorganisms play a role in the remediation process. Studies that have identified surfactant desorption from SMZ are outlined. Finally, the toxicity of a commonly used cationic surfactant towards microorganisms is discussed. This review highlights the potential for surfactant to desorb from the zeolite surface and the need for further research into the toxicity of this desorbed surfactant towards microorganisms, including pathogens and environmental microbes.
Publisher: American Geophysical Union (AGU)
Date: 11-2012
DOI: 10.1029/2012JB009496
Publisher: American Geophysical Union (AGU)
Date: 17-06-2015
DOI: 10.1002/2015GL064519
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 06-2020
Publisher: American Geophysical Union (AGU)
Date: 21-03-2013
DOI: 10.1002/GRL.50189
Publisher: Elsevier BV
Date: 10-2017
DOI: 10.1016/J.JHAZMAT.2017.06.022
Abstract: Surfactant Modified Zeolite (SMZ) represents a versatile, cost-effective permeable reactive material, capable of treating multiple classes of contaminants. The potential for HDTMA-Br, a cationic surfactant commonly used to modify zeolite, to desorb from the zeolite surface has been identified as a potential issue for the ongoing use of SMZ in water remediation contexts. This paper investigates the toxicity of HDTMA-Br towards enteric virus surrogates, F-RNA bacteriophage MS2 and E. coli, Bacillus subtilis, and soil microflora. The concentration of surfactant desorbing from SMZ was quantified through a bioassay using E. coli. Results showed HDTMA-Br concentrations of ≥10
Publisher: Geological Society of America
Date: 09-11-2018
DOI: 10.1130/G45436.1
Publisher: American Geophysical Union (AGU)
Date: 11-2022
DOI: 10.1029/2022WR033272
Abstract: Water level monitoring data from 5 deep wells on the North China Platform are used to study how two large earthquakes impact deep aquifers. After the passage of seismic waves from earthquakes, a subset of these wells shows changes in the phase shifts of water level responses to lunar diurnal ( O 1 ) and semidiurnal ( M 2 ) tides. We fit a model for the tidal responses of hydraulically conductive fractures that intersect the wells to explain the phase and litude of responses to both O 1 and M 2 tides. To explain changes after the earthquakes with this model, the apparent orientation of fractures must change. Because the stresses are small, we propose that changes in tidal response occur when the passage of seismic waves modifies the hydraulic connectivity of a network of fractures by unclogging or clogging flow paths, thus changing the apparent orientation of the fractures controlling tidal responses. The seismic energy density that results in changes appears to decrease as the dominant frequency of seismic waves increases.
Publisher: American Geophysical Union (AGU)
Date: 07-2016
DOI: 10.1002/2015GC006053
Publisher: American Association for the Advancement of Science (AAAS)
Date: 05-01-2018
Abstract: A submersible study of the products of a large submarine eruption demonstrates the influence of the ocean on eruption dynamics.
Publisher: American Geophysical Union (AGU)
Date: 25-04-2016
DOI: 10.1002/2016GL068560
Publisher: American Geophysical Union (AGU)
Date: 07-2014
DOI: 10.1002/2014GC005402
Publisher: Elsevier BV
Date: 15-06-2005
Publisher: Elsevier BV
Date: 05-2013
Publisher: American Geophysical Union (AGU)
Date: 02-2015
DOI: 10.1002/2014GC005652
Publisher: Geological Society of America
Date: 04-0004
DOI: 10.1130/G33685.1
Publisher: American Geophysical Union (AGU)
Date: 02-03-2020
DOI: 10.1029/2019GL086768
Publisher: Geological Society of America
Date: 27-09-2016
DOI: 10.1130/B31448.1
Location: United States of America
Start Date: 2017
End Date: 2020
Funder: Marsden Fund
View Funded ActivityStart Date: 10-2023
End Date: 10-2026
Amount: $475,000.00
Funder: Australian Research Council
View Funded Activity