Department of Earth Sciences
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Differentiation and stabilisation of the Archean continental crust, the example of the northern edge of the Kaapvaal craton, South Africa
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: The Earth is one of the only solid celestial bodies displaying, at present day, an internal activity significant enough to modify its surface. This activity is mostly pictured by plate tectonic motions, ...
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Repeated partial melting events in the polymetamorphic Carlos Chagas batholith : implications for the tectono-metamorphic evolution of the Araçuaí orogen (southeastern Brazil)
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: The Araçuaí orogen (AO), located in the southeastern Brazil, and its African counterpart, the West Congo belt, is part of the Pan-African-Brasiliano orogenic system developed between the Congo and São ...
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The biogeochemistry of bioactive trace elements cadmium and cobalt in the Southern Ocean, Atlantic Sector
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: The biogeochemical cycling of the bio-active dissolved trace metals cadmium (DCd) and cobalt (DCo), are reported on a meridional transect of the Southern Atlantic, spanning 36°S to 68°S. Seawater samples ...
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Measurement of bioactive trace metals (Cu and Zn) in the Southern Ocean : validation of sampling protocol and ICP-MS based analytical method
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: A method comprising an improved seawater collection protocol and subsequent Inductively Coupled Plasma Mass Spectrometry (ICP-MS) based analytical technique was validated through an intercalibration ...
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The geometry of Karoo dolerite dykes and saucers in the Highveld Coalfield : constraints on emplacement processes of mafic magmas in the shallow crust
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT: This dissertation is a compilation of two case studies that integrates an extensive underground mining and drilling data set on Karoo dolerite intrusions in the Highveld Coalfield to constrain the ...
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The lithostratigraphy and structural components of the Eureka Shear Zone, southern Namibia
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT: The newly recognised Eureka Shear Zone (ESZ) in southern Namibia is a Late-Mesoproterozoic to Early Neoproterozoic high strain zone in the Namaqua sector of the Namaqua Natal Metamorphic Province (NNMP). ...
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The effect of winery wastewater irrigation on the properties of selected soils from the South African wine region
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT: Due to an increase in wine production as well as an intensification of environmental legislation in South Africa, the need for guidelines for sustainable management of winery wastewater has increased. To ...
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Magma accumulation and segregation during regional-scale folding : the Holland’s dome granite injection complex, Damara belt, Namibia.
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT: Mid-crustal, upper amphibolite-facies rocks in the south Central Zone magmatic arc of the Damara belt in central Namibia contain kilometre-scale networks of intrusive, sheet-like leucogranites. These ...
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The emergence of modern sea ice cover in the Arctic Ocean
(Springer Nature, 2014-07)Arctic sea ice coverage is shrinking in response to global climate change and summer ice-free conditions in the Arctic Ocean are predicted by the end of the century. The validity of this prediction could potentially be ...
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Ice sheet deformation in the Table Mountain group, Western Cape
(Stellenbosch : Stellenbosch University, 1970-05)ENGLISH ABSTRACT: The Lower Paleozoic glaciogenic sediments of the Table Mountain Group are interpreted as the result of two ice sheet advances into the active Table Mountain embayment. Subglacial deformation during the ...
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Geology, structural evolution and controls of hydrothermal gold mineralization in the Eastern Karagwe-Ankole fold belt, North Western Tanzania
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: In central-east Africa, the north-western margin of the Archaean Tanzania Craton (TC) is overlain by imbricated, low grade, volcano-sedimentary rocks of the Karagwe-Ankole belt’s (KAB) Eastern Domain (ED). ...
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Mineralogical and geochemical variations in the UG2 reef at Booysendal and Zondereinde mines, with implications for beneficiation of PGM
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: The layered intrusion of the Bushveld Complex, South Africa hosts the world’s largest concentration of platinum group elements (PGE), which are principally mined from three mineralised horizons namely, ...
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Bulk geochemical, biomarker and leaf wax isotope records of Mfabeni peatland, KwaZulu Natal, South Africa since the late Pleistocene
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Southern Africa is a topographically diverse region that is influenced by temperate, sub-tropical and tropical climates encompassing varying rainfall zones. The core regional contemporary climatic drivers ...
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The processes of melt segregation, magma ascent and pluton emplacement in the continental crust of the Damara Belt, Namibia
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Theoretical models of meso- and macroscale granitic melt/magma transport commonly invoke a prominent role for dilatant fracturing of the wall rocks, but supporting field evidence is in many cases only ...
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Relationship of historical copper mining to the transport and accumulation of trace metals and salts in semi-arid environments : an example from Buffels River, Northern Cape, South Africa
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: The town of Kleinzee, located in the Northern Cape, South Africa exists solely to mine alluvial diamonds found in the Buffels River. Given the very low precipitation of the area (generally <150mm/yr) ...
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An experimental investigation into the ‘fate’ of entrained peritectic minerals in I-type granite magmas intruded at below 2kbar.
(Stellenbosch : Stellenbosch University, 2016-04)ENGLISH ABSTRACT: Entrainment of a peritectic mineral assemblage, formed through the incongruent melting of biotite and hornblende in a source of intermediate composition, has been proposed to account for the fact that ...
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Application of hydrochemistry and residence time constraints to distinguish groundwater systems in the Karoo Basin prior to shale-gas exploration
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: The possibility of shale-gas development in the semi-arid Karoo Basin, South Africa has created the need to develop a hydrochemical baseline for deep Karoo groundwater. However, it is uncertain how the ...
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Disequilibrium melting of plagioclase during biotite fluid-absent anatexis of metapelites in the South Marginal Zone of the Limpopo belt, South Africa
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: This study investigated the behaviour of plagioclase during fluid-absent biotite melting in a metapelitic source from which peraluminous granite magma had segregated. The study focused on the Bandelierkop ...
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Rcrust : a tool for calculating path-dependent open system processes and application to melt loss
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Earth‘s continental crust is stabilised by crustal differentiation that is driven by partial melting and melt loss: Magmas segregate from their residuum and migrate into the upper crust, leaving the ...
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Photosynthetic response of Southern Ocean phytoplankton under iron and light limitations : bioassay experiments
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: The Southern Ocean (SO) is of significant interest in the understanding of the global carbon cycle and therefore many studies have been conducted to determine the limiting factors controlling the ...
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Remote sensing driven lithological discrimination within nappes of the Naukluft Nappe Complex, Namibia
(Stellenbosch : Stellenbosch University, 2015-04)ENGLISH ABSTRACT: Geological remote sensing is a powerful tool for lithological discrimination, especially in arid regions with minimal vegetative cover to obscure rock exposures. Commercial multispectral imaging satellites ...
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A comparison between diamictites at the Witteberg-Dwyka contact in southern South Africa
(Stellenbosch : Stellenbosch University, 2015-04)ENGLISH ABSTRACT: Diamictites are sedimentary deposits that originate from a number of different environments, the most common being associated with a glacial environment. Although this association is not, in all cases ...
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The metamorphic and anatectic history of Archaean metapelitic granulites from the South Marginal Zone, Limpopo Belt, South Africa.
(Stellenbosch : Stellenbosch University, 2015-04)ENGLISH ABSTRACT: Anatexis is the first step in granite genesis. Partial melting in the lower crust may produce leucoratic features of unusual chemical compositions, very different from the final products of crustal ...
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Pyroxene stability within kimberlite magma in the upper mantle : an experimental investigation
(Stellenbosch : Stellenbosch University, 2015-04)ENGLISH ABSTRACT: Entrainment and assimilation of xenolithic material during kimberlite ascent is considered to be important in shaping the chemistry of the magma and fuelling magma ascent by driving CO2 exsolution. Previous, ...
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Structure and evolution of basin and petroleum systems within a transformrelated passive margin setting : data-based insights from crust-scale 3D modelling of the Western Bredasdorp Basin, offshore South Africa
(Stellenbosch : Stellenbosch UniversityStellenbosch University, 2015-04)ENGLISH ABSTRACT: This study investigates the crustal structure, and assesses the qualitative and quantitative impacts of crust-mantle dynamics on subsidence pattern, past and present-day thermal field and petroleum system ...
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An experimental investigation on the fate of xenocrystic garnet in kimberlitic melts under upper mantle conditions
(Stellenbosch : Stellenbosch University, 2015-04)ENGLISH ABSTRACT: Insets of large anhedral minerals in kimberlites are proposed to mainly have their origin from the disaggregation of mantle-derived xenoliths through mechanical abrasion by the ascending kimberlite magma. ...
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Salinisation source(s) and mechanism(s) in shallow alluvial aquifers along the Buffels River, Northern Cape Province, South Africa
(Stellenbosch : Stellenbosch University, 2015-04)ENGLISH ABSTRACT: Several areas in Namaqualand are affected by elevated levels of salinity; including the shallow alluvial aquifers along the Buffels River catchment. The chemistry of rainwater that recharges these aquifers ...
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Correlation between knowledge of HIV, attitudes and perceptions of HIV and a willingness to test for HIV at a regional hospital in KwaZulu-Natal, South Africa
(AOSIS Publishing, 2012-07)Background: With millions of South Africans infected with human immunodeficiency virus (HIV) and less than 10% of the population aware of their HIV status, HIV counselling and testing (HCT) is the first step in any attempt ...
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Numeric geochemical reaction modelling, incorporating systems theory and implications for sustainable development : study on East Rand basin acid mine drainage, Witwatersrand, South Africa
(2014-12)ENGLISH ABSTRACT: In recent years acid mine drainage (AMD) has become the focus on many mine sites throughout the world. The Witwatersrand gold mines have been the main focus of AMD in South Africa due to their extensive impact ...
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Development and implementation of a flow injection analyser with chemiluminescence for detection of sub-nanomolar Fe in seawater
(Stellenbosch : Stellenbosch University, 2014-12)ENGLISH ABSTRACT: Iron is an essential micronutrient for all phytoplankton and is found in seawater at picomolar-level concentrations. For the first time in South Africa, a technique that utilizes a flow injection analyser ...
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