A5070793002- Geochemistry and Elemental Analysis
- Paleontology and Stratigraphy of Fossils
- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- Radioactive element chemistry and processing
- Geomagnetism and Paleomagnetism Studies
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Geological formations and processes
- Geological and Geophysical Studies
- Mineral Processing and Grinding
- Minerals Flotation and Separation Techniques
- Metal Extraction and Bioleaching
- earthquake and tectonic studies
- Mining Techniques and Economics
- Aquatic and Environmental Studies
- Mining and Resource Management
- Polar Research and Ecology
- Infrastructure Maintenance and Monitoring
- Geological Studies and Exploration
- High-pressure geophysics and materials
- Structural Analysis of Composite Materials
- Nuclear materials and radiation effects
- Facilities and Workplace Management
- Heavy metals in environment
University of Johannesburg
2013-2024
National Research Foundation
2017-2024
Paint Research Association
1997
This paper documents the sedimentological setting, mineralogy, and geochemistry of several iron formation units interbedded with siliciclastic strata Mesoarchean Witwatersrand Supergroup, well known for its world-class conglomerate-hosted Au-U deposits. Four major beds, associated magnetic mudstones, are present in two distinctly different lithostratigraphic associations, namely shale- diamictiteassociated formation. The shale association is represented by Water Tower Contorted Bed...
Abstract The Mesoarchaean (2.96 to 2.91 Ga) Witwatersrand-Mozaan succession of southern Africa contains multiple units that show evidence for the presence free molecular oxygen in oceanic water columns approximately 500 million years prior Great Oxidation Event. lithostratgraphically correlatable Thalu and Brixton formations Mozaan West Rand groups, respectively, now yield further an oxygen-containing column. two contain beds manganese carbonate-bearing mudstone. This study documents these...
Abstract We document the discovery of first granular iron formation ( GIF ) Archaean age and present textural geochemical results that suggest these formed through microbial oxidation. The occurs in Nconga Formation ca. 3.0–2.8 Ga Pongola Supergroup South Africa Swaziland. It is interbedded with oxide silicate facies micritic MIF ). There a strong control on mineralization not observed associated . marked by oncoids chert cores surrounded magnetite calcite rims. These rims show laminated...
Banded iron formation-hosted high-grade (>60 weight percent (wt%) (Fe)) hematite ore deposits make up the bulk of world's production and reserves. They developed mainly through supergene and/or hydrothermal leaching silica from formation host rock under oxidizing conditions. Early Palaeoproterozoic formations Transvaal Supergroup several such deposits. The largest ones are in Asbesheuwels Subgroup on Maremane Dome, between Sishen Postmasburg Northern Cape Province South Africa. These...
Banded iron formations (BIFs) have been at the center of many debates in geology, especially regarding early (i.e., Archean and Paleoproterozoic) Earth its surface environments. BIFs are chemical sedimentary rocks that an anomalously high content (>15 wt% Fe) typically contain
Jaana Halla, Nora Noffke, Humberto Reis, Stanley Awramik, Andrey Bekker, Alexander Brasier, Flávia Callefo, Adrita Choudhury, Jan-Peter Duda, Christopher Fedo, Douglas Galante, Jessica Haddock, Peter Haines, Linda Hinnov, Axel Hofmann, Martin Homann, David Huston, Simon Johnson, Kah, Alan Kaufman, Alex Kovalick, Matheus Kuchenbecker, Juha Köykkä, Donald Lowe, Noah Nhleko, Barry Reno, Evelyn Sanchez, Yogmaya Shukla, Albertus Smith, Mark Van Zuilen, Frances Westall, Whitehouse. Episodes...
Abstract Precambrian banded iron formations (BIFs) are iron- and silica-rich (bio)chemical sediments that widely believed to have been precipitated by microbial oxidation of dissolved Fe(II). The by-product these metabolisms – insoluble ferric would settled through the water column, often as aggregates with cell biomass. While mineralogy, composition physical properties cell-iron mineral formed anaerobic Fe(II)-oxidising photoferrotrophic bacteria extensively studied, there limited studies...
Abstract The Nconga Formation of the Mesoarchean (~2.96–2.84 Ga) Mozaan Group Pongola Supergroup southern Africa contains world’s oldest known granular iron formation. Three dimensional reconstructions granules using micro-focus X-ray computed tomography reveal that these are microstromatolites coated by magnetite and calcite, can therefore be classified as oncoids. also show damage to granule coatings caused sedimentary transport during formation eventual deposition density currents....
The Makganyene Formation is a Siderian (2.45–2.22 Ga) diamictite-dominated succession, with both outcrop and subcrop in the Griqualand West Basin of Transvaal Group South Africa. We provide new core descriptions from this supplemented by microscopic analyses, to present an updated depositional model for classic Palaeoproterozoic diamictite. Although internal correlation successions not possible, recurring pattern observed where diamictites are organised into coarsening-upward motifs at tens...
Abstract A diabase sill intersected in drill core GHEX-59 from the Avontuur deposit of Kalahari Manganese Field South Africa displays an 8 m thick paleosaprolitic weathering profile developed below regional unconformity at base ~2.0 Ga red-bed succession Gamagara Formation Elim Group (Keis Supergroup). Tracking element mobility weathered relative to unaltered parent material assists reconstruction surface conditions and nature pore waters associated with Paleoproterozoic. The upper part...