Department of Earth Sciences
Collections in this community
Recent Submissions
-
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 ...
-
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). ...
-
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, ...
-
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 ...
-
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 ...
-
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) ...
-
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 ...
-
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 ...
-
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 ...
-
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 ...
-
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 ...
-
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 ...
-
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 ...
-
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 ...
-
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, ...
-
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 ...
-
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. ...
-
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 ...
-
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 ...
-
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 ...
-
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 ...
-
The petrogenesis of the Nelshoogte pluton: The youngest and most compositionally variable TTG pluton in the Barberton Granite-Greenstone Terrain
(Stellenbosch : Stellenbosch University, 2014-04)ENGLISH ABSTRACT: The compositions of tonalite-trondhjemite-granodiorite (TTG)-series rocks from the Barberton Granite-Greenstone Terrain (BGGT) of Southern Africa vary in terms of major element concentrations ...
-
The petrogenesis of the ignimbrites and quartz porphyritic granites exposed along the coast at Saldahna, South Africa
(Stellenbosch : Stellenbosch University, 2013-12)ENGLISH ABSTRACT: To date, the only volcanic rocks described from the Cape Granite Suite are ignimbrites that crop out along the western margin of Langebaan lagoon, to the south of Saldahna. These ignimbrites, with an age ...
-
The origin of rhythmic magmatic layering in coarse-grained porphyritic S-type granite of the Peninsula pluton, Cape Granite Suite, South Africa
(Stellenbosch : Stellenbosch University, 2013-12)ENGLISH ABSTRACT: Rhythmic magmatic layering in granites is an intriguing feature that has been reported from plutons with contrasting chemical compositions from a wide range of tectonic settings. Layered granites are rare ...
-
Distribution and characterization of marine iron-rich particles
(Stellenbosch : Stellenbosch University, 2013-12)ENGLISH ABSTRACT: This thesis investigates questions surrounding the role that iron-rich colloids (nominally sized between 0.02 μm and 0.2 μm) and particulates (>0.2-0.45 μm) play in the context of the greater ...
-
Granitic melt transport and emplacement along transcurrent shear zones : case study of the Pofadder Shear Zone in South Africa and Namibia
(Stellenbosch : Stellenbosch University, 2013-12)ENGLISH ABSTRACT: The close spatial and temporal relationship of shear-zones and magmas is commonly interpreted to indicate positive feedback between magma migration, granitic emplacement and shear-zone-associated deformation. ...
-
The formation of Earth’s early felsic continental crust by water-present eclogite melting
(Stellenbosch : Stellenbosch University, 2013-03)ENGLISH ABSTRACT: The sodic and leucocratic Tonalite, Trondhjemite and Granodiorite (TTG) granitoid series of rocks characterise Paleo- to Meso- Archaean felsic continental crust, yet are uncommon in the post-Archaean ...
-
Phase relations and Pt solubility in sulphide melt in the FE-NI-CU-S system at 1 ATM : implications for evulution of sulphide magma in the Merensky reef, Bushveld Complex, South Africa
(Stellenbosch : Stellenbosch University, 2013-03)ENGLISH ABSTRACT: It is widely accepted that sulphide is the carrier and concentrator of PGEs during magmatic mineralization episodes in the Merensky Reef (MR). PGE concentration peaks and sulphide volume percent peaks are ...
-
Rhyolitic volcanism in the Onverwacht Group, Barberton Greenstone Belt
(Stellenbosch : Stellenbosch University, 2013-03)ENGLISH ABSTRACT: The source of the K2O in the K2O-rich ~3.45 Ga felsic intrusive rocks of the H6 unit in the Hooggenoeg Formation of the Onverwacht Group in the Barberton Granite Greenstone Terrain (BGGT) is examined in ...
-
Geochemical and mineralogical characterisation of Vaalputs palaeosols : inference of paleoclimates
(Stellenbosch : Stellenbosch University, 2013-03)ENGLISH ABSTRACT: Vaalputs radioactive waste disposal facility is situated in an arid region of Bushmanland currently with evapotranspiration potential that far exceeds precipitation. Dominant soil features in Vaalputs are ...
RSS 1.0