A5007191033- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geochemistry and Geologic Mapping
- High-pressure geophysics and materials
- Geochemistry and Elemental Analysis
- Geological and Geophysical Studies
- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Radioactive element chemistry and processing
- Hydrocarbon exploration and reservoir analysis
- Extraction and Separation Processes
- Geological Studies and Exploration
- Pleistocene-Era Hominins and Archaeology
- Mineralogy and Gemology Studies
- Metallurgical Processes and Thermodynamics
- Evolution and Paleontology Studies
- Analytical chemistry methods development
- Clay minerals and soil interactions
- Geological formations and processes
- Archaeology and Rock Art Studies
- Problem and Project Based Learning
- Geotechnical and Geomechanical Engineering
- Forensic Anthropology and Bioarchaeology Studies
- Geophysical and Geoelectrical Methods
- Various Chemistry Research Topics
The University of Adelaide
2020-2025
James Cook University
2014-2023
Townsville Hospital
2021
University of Bern
2006-2014
Environmental Earth Sciences
2011
Universidad Iberoamericana
2008
Australian National University
2000-2007
The phase and melting relations in subducted pelites have been investigated experimentally at conditions relevant for slabs sub-arc depths (T¼600^10508C, P¼25^45 GPa). fluid-present experiments produced a dominant paragenesis consisting of garnet-phengite-clinopyroxene-coesite-kyanite that coexists with fluid run conditions. Garnet contains detectable amounts Na2O (up to 05 wt%), P2O5 056 TiO2 09 wt%) all experiments. Phengite is stable up 10008C 45 GPa characterized by high contents 2 wt%....
New ages for flowstone, sediments and fossil bones from the Dinaledi Chamber are presented. We combined optically stimulated luminescence dating of with U-Th palaeomagnetic analyses flowstones to establish that all containing Homo naledi fossils can be allocated a single stratigraphic entity (sub-unit 3b), interpreted deposited between 236 ka 414 ka. This result has been confirmed independently by three H. teeth U-series electron spin resonance (US-ESR) dating. Two scenarios were tested...
We provide new insights into the geochemistry of serpentinites from mid-ocean ridges (Mid-Atlantic Ridge and Hess Deep), passive margins (Iberia Abyssal Plain Newfoundland) fore-arcs (Mariana Guatemala) based on bulk-rock in situ mineral major trace element compositional data collected drill cores Deep Sea Drilling Project Ocean Program. These are important for constraining serpentinite-hosted inventory subduction zones. Bulk show up to several orders magnitude enrichments Cl, B, Sr, U, Sb,...
To contribute to our understanding of the mechanisms and pathways fluid movement through deeply subducted crust, we investigate high-pressure veins cutting eclogite-facies (∼2·0 GPa ∼600°C) metagabbros Monviso Ophiolite, Italian Western Alps. The consist mainly omphacite with minor garnet, rutile, talc accessory zircon. Most vein minerals have major trace element compositions that are comparable host-rock minerals, zircons similar Hf isotopic compositions. These observations support...
Abstract The distribution of REE minerals in metasedimentary rocks was investigated to gain insight into the stability allanite, monazite and xenotime metapelites. Samples were collected central Swiss Alps, along a well‐established metamorphic field gradient that record conditions from very low grade metamorphism (250 °C) lower amphibolite facies (∼600 °C). In Alpine metapelites investigated, mass balance calculations show LREE are mainly transferred between allanite during course prograde...
To investigate eclogite melting under mantle conditions, we have performed a series of piston-cylinder experiments using homogeneous synthetic starting material (GA2) that is representative altered mid-ocean ridge basalt. Experiments were conducted at pressures 3·0, 4·0 and 5·0 GPa over temperature range 1200–1600°C. The subsolidus mineralogy GA2 consists garnet clinopyroxene with minor quartz–coesite, rutile feldspar. Solidus temperatures are located 1230°C 3·0 1300°C GPa, giving steep...
This paper evaluates controls on cassiterite crystallization under hydrothermal conditions based the textural setting and geochemistry of from six different mineralization environments world-class Gejiu tin district, southwest China. The samples feature diverse internal textures, as revealed by cathodoluminescence (CL) imaging, contain a range trivalent (Ga, Sc, Fe, Sb), quadrivalent (W, U, Ti, Zr, Hf), pentavalent (Nb, Ta, V) trace elements, with W being most abundant elements. Cassiterite...
Research Article| November 01, 2005 Origin of chromitites in layered intrusions: Evidence from chromite-hosted melt inclusions the Stillwater Complex Carl Spandler; Spandler 1Research School Earth Sciences, Australian National University, Canberra 0200, Australia Search for other works by this author on: GSW Google Scholar John Mavrogenes; Mavrogenes 2Research and Department Marine Richard Arculus 3Department Geology (2005) 33 (11): 893–896. https://doi.org/10.1130/G21912.1 Article history...