Department of Earth Sciences
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Evolution of the continental crust and significance of the zircon record, a case study from the French Massif Central.
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: The formation of the continental crust is a major consequence of Earth di erentiation. Recent advances on this topic bene ted from improvements of analytical techniques enabling in situ measurements of ...
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An experimental investigation of the “fate” of entrained peritectic minerals during adiabatic ascent of S-type granite magmas
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: S-type granites generally display a wide range of trace and major element compositional variation, from tonalitic to leucogranitic compositions. A substantial volume of past research has investigated the ...
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36 Chlorine isotope systematics in saline groundwater in the Buffels River Valley
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: It is typical for coastal aquifers in arid regions to be affected by salinisation, populations in these areas that rely upon groundwater resources are often directly afflicted by this phenomenon. Large ...
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Deep groundwater characterisation and recharge estimation in the Verlorenvlei catchment
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: Secondary aquifers are a primary source of water in many semi-arid regions, and understanding groundwater recharge is necessary for the effective management of this resource. The Chloride Mass Balance ...
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An investigation of the petrogenesis of the Buddusò I-type granites and its mafic enclaves in Sardinia, Italy.
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: There is still great debate surrounding the petrogenesis of I-type granites with mafic enclaves. The granite controversy indulges three prevalent processes/models surrounding the typical range in chemistry ...
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The Lithological and Structural Characterisation of the Sperlingputs Shear Zone in Southern Namibia
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: The Richtersveld Magmatic Arc (RMA) forms a major ~200km wide Palaeoproterozoic block within the Mesoproterozoic Namaqua Metamorphic Province (NMP). The RMA consist of rafts of Orange River Group volcanic ...
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Aerosol trace metal concentration and dissolution characteristics from known dust emitters in southern Africa
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: Dust can be a source of micronutrients to surrounding areas such as oceans and terrestrial regions. The deposition of dust can provide trace elements to the open oceans, which can increase primary production ...
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Geological setting and evolution of the Omitiomire Cu deposit in the Southern Zone accretionary prism of the Damara Belt, Namibia
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: Shear Zone hosted Cu mineralisation in the Deep Level Southern Zone accretionary prism of the Damara Belt is associated with deformation and fluid flow related to the exhumation of the Mesoproterozoic ...
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Sedimentology of the southern Karoo ripon formation and the southwestern Karoo Vischkuil/Laingsburg formations of the Ecca Group: implications for basin and palaeoenvironmental reconstruction
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: Between the towns of Prince Albert (Western Cape) and Willowmore (Eastern Cape) the well-known Laingsburg depocenter and less-known Ripon depocenter of the southern Main Karoo Basin (South Africa) meet ...
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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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Influence of water availability in the distributions of branched glycerol dialkyl glycerol tetraether in soils of the Iberian Peninsula
(European Geosciences Union, 2014)The combined application of the MBT (degree of methylation) and CBT (degree of cyclization) indices, based on the distribution of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in soils, has been proposed as a ...
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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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