A5036761042- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- earthquake and tectonic studies
- Geochemistry and Geologic Mapping
- Metal Extraction and Bioleaching
- Mineral Processing and Grinding
- Geochemistry and Elemental Analysis
- Mineralogy and Gemology Studies
- Geological Studies and Exploration
- Paleontology and Stratigraphy of Fossils
- Minerals Flotation and Separation Techniques
- Radioactive element chemistry and processing
- Geomagnetism and Paleomagnetism Studies
- Hydrocarbon exploration and reservoir analysis
- Clay minerals and soil interactions
- Extraction and Separation Processes
- Geological and Geophysical Studies
- Geotechnical and Geomechanical Engineering
- Geology and Paleoclimatology Research
- Astro and Planetary Science
- Mining Techniques and Economics
- Diamond and Carbon-based Materials Research
- Geological Formations and Processes Exploration
- Geological and Geophysical Studies Worldwide
- Groundwater and Isotope Geochemistry
University of Johannesburg
2016-2025
National Research Foundation
2024
University of the Witwatersrand
1995-2019
Anglo American (South Africa)
1992-2019
University of Glasgow
2019
Goethe University Frankfurt
2019
Durham University
2019
Mintek
2019
University of Cape Town
2019
De Beers (South Africa)
1999-2010
The lithospheric mantle beneath the Kaapvaal-Zimbabwe craton of southern Africa shows variations in seismic P-wave velocity at depths within diamond stability field that correlate with differences composition diamonds and their syngenetic inclusions. Middle Archean depletion events initiated keel formation early harzburgitic formation. Late accretionary involving an oceanic lithosphere component stabilized contributed a younger generation eclogitic diamonds. Subsequent Proterozoic tectonic...
Eclogite xenoliths recovered from kimberlites and alkali basalts are clinoproxene garnet rich rocks formed at high pressures within the mantle. They broadly 'basaltic' in composition their genesis remains controversial. Early models suggested that they represent metamorphic end product of (frozen) magma never made it to shallow depths instead crystallised mantle pressures. However, most recent favour an origin where gabbros generated subducted back into mantle, converted eclogite subduction...
Abstract The mineralogy, chemical composition, and physical properties of cratonic mantle eclogites with oceanic crustal protoliths can be modified by secondary processes involving interaction fluids melts, generated in various slab lithologies upon subduction (auto‐metasomatism) or metasomatism after emplacement into the lithosphere. Here we combine new published data to isolate these signatures evaluate their effects on eclogite. Mantle kimberlite‐like, ultramafic carbonated melts (UM...
This study identifies the mineralogy and determines chemical compositions equilibration conditions of representative syngentic inclusions in diamonds from mined Venetia kimberlites.
Abstract Oxygen fugacity (ƒO 2 ) is an intensive variable implicated in a range of processes that have shaped the Earth system, but there controversy on timing and rate oxidation uppermost convecting mantle to its present ƒO around fayalite-magnetite-quartz oxygen buffer. Here, we report Fe 3+ /ΣFe for ancient eclogite xenoliths with oceanic crustal protoliths sampled coeval ambient mantle. Using new published data, demonstrate these eclogites, two redox proxies, V/Sc /ΣFe, behave...
Eclogite xenolith varieties at Kaalvallei include accessory-free bimineralic xenoliths, diamond-bearing eclogite, corundum-bearing garnet-websterite, alkremite and spinel-bearing eclogite. The xenoliths can be accurately classified into previously defined Group I II on both petrographic geochemical principles. eclogites (including eclogite) are considered to derive from a heterogeneous protolith. genesis might have been by residue formation associated with the dehydration partial melting of...
Abstract The Wajrakarur Kimberlite Field (WKF) on the Eastern Dharwar Craton in southern India hosts several occurrences of Mesoproterozoic kimberlites, lamproites and ultramafic lamprophyres, for which mantle-derived xenoliths are rare only poorly preserved. general paucity mantle cargo has hampered investigation nature evolution continental lithospheric (CLM) beneath cratonic India. We present a comprehensive study major trace element compositions clinopyroxene garnet xenocrysts recovered...
Decades of studies have shown that the petrogenesis kimberlite-borne cratonic eclogite and pyroxenite xenoliths reflects endemics their crustal protoliths local lithosphere evolution. Detailed investigations origin metasomatic history individual xenolith suites are thus required to understand how reservoirs - diamond inventory evolve in regional tectonomagmatic context. Here, we investigate a little-studied suite from Balmoral kimberlite Kimberley area Kaapvaal craton, which, like...