Browsing Doctoral Degrees (Earth Sciences) by Title
Now showing items 10-29 of 34
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Experimental evidence for sulphide magma percolation and evolution : relevant to the chromite bearing reefs of the Bushveld Complex
(Stellenbosch : Stellenbosch University, 2012-03)ENGLISH ABSTRACT: Pt mineralization within the Bushveld Complex is strikingly focused on the chromitite reefs, despite these horizons being associated with low volumes of base metal sulphide relative to Pt grade. Partitioning ... -
Fluid and deformation induced partial melting and melt escape in low-temperature granulite-facies metasediments, Damara Belt, Namibia.
(Stellenbosch : University of Stellenbosch, 2009-03)Fluid-present partial melting has generally been regarded a poor candidate for effecting crustal differentiation. In this study I report on anatectic metasediments from the Pan-African Damara Belt in Namibia that have ... -
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 ... -
Genesis and evolution of a Neoproterozoic magmatic arc: the cordilleran-type granitoids of the Araçuaí Belt, Brazil.
(Stellenbosch : Stellenbosch University, 2018-12)ENGLISH ABSTRACT: The Araçuaí orogen (SE Brazil) is one of the largest (350,000 km2) and long-lived (ca. 630 – 480 Ma) granitic province in the world. Its wide variety of granitoids recording mid- to lower crustal P - T ... -
The geochemical evolution of the alkaline and carbonatite complexes of the Damaraland igneous province, South West Africa
(Stellenbosch : Stellenbosch University, 1978-12)ENGLISH ABSTRACT: The DamaraLand igneous province &n northern South West Africa contains basalt/granite, alkaline, peralkaline and carbonatite complexes. The geochemical features of the Okorusu, Kalkfeld, Ondurakorwne and ... -
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 ... -
Die geologie van 'n gebied in Noord-Oos Transvaal met spesiale verwysing na die verspreiding en petrografie van die rotssoorte van die Palabora-stollings-kompleks
(Stellenbosch : Stellenbosch University, 1948-12) -
The geology and petrology of the Marble Delta
(Stellenbosch : Stellenbosch University, 1973-02)The Marble Delta is an area of approximately 40 sq. km in Natal (30°22' Long., 30°40' Lat.), occupied by Precambrian marble and associated granites. The deeply dissected country was geologically mapped on a scale of I : 6 ... -
The geology and petrology of the Merelani tanzanite deposit, NE Tanzania
(Stellenbosch : University of Stellenbosch, 2006-12)Tanzanite, a blue/violet gemstone variety of zoisite (Ca2Al2O.AlOH[Si2O7][SiO4]) is only produced in NE Tanzania. The only known locality is an approximately 7km2 deposit in the Merelani area. It is one of the most sought ... -
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). ... -
Geometry and emplacement controls of dolerite sill complexes in the Karoo basin
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: This dissertation is a compilation of three case studies that integrates drilling, field and geophysical data on dolerite sill complexes across the Karoo basin to constrain the emplacement processes, ... -
Gold mineralisation in the Kirk Range area, southern Malawi
(Stellenbosch : Stellenbosch University, 2020-12)ENGLISH ABSTRACT: This study aims at understanding the characteristics and controls of gold mineralisation in the Kirk Range area, southern Malawi. Malawi’s mineral inventory is not known, particularly this is attributed ... -
The low-pressure partial-melting behaviour of natural boron-bearing metapelites from the Mt Stafford area, Central Australia
(Stellenbosch : University of Stellenbosch, 2011-12)ENGLISH ABSTRACT: This study has examined the 3 kbar partial melting behaviour of 4 metapelites collected from the highest grade rocks occurring below the anatectic zone of the Mt Stafford area, Arunta Inlier, central ... -
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 ... -
Modern-ocean ground-truthing of planktic foraminifer nitrogen isotopes : a proxy for surface ocean nutrient conditions
(Stellenbosch : Stellenbosch University, 2020-04)ENGLISH ABSTRACT: The nitrogen (N) isotope ratios (δ15N) of organic matter trapped within the fossil shells of planktic foraminifera, upper-ocean dwelling zooplankton, are providing a new lens through which to examine the ... -
On the sedimentation of the Table Mountain Group in the Western Cape Province
(Stellenbosch : Stellenbosch University, 1967-11)INTRODUCTION: This dissertation aims to illuminate some surprises which the deceptively uncomplicated Table Mountain sandstone had long been harbouring in its kloofs and cliffs . The major contributions of this first ... -
Petrogenesis of S-type granites : the example of the Cape Granite Suite
(Stellenbosch : University of Stellenbosch, 2010-03)ENGLISH SUMMARY: S-type granite intrusions are extremely common in the continental crust and form from the partial melting of metasediments. Compositions of S-type granite range from leucogranite to granodiorite and have ... -
The petrogenesis of the older (> 3.0 Ga) potassic granitoids of eastern Mpumalanga (South Africa) and Swaziland : an investigation of crustal formation processes in the early Earth
(Stellenbosch : Stellenbosch University, 2012-03)ENGLISH ABSTRACT: Earth’s oldest preserved granitoid crust dates back to the Paleoarchean and consists predominantly of sodic tonalite-trondhjemite-granodiorite (TTG) granitoids that arose through the partial melting ... -
Petrology and mineral chemistry of sulphide ores and associated metalliferous rocks of the Gamsberg Zn-Pb deposit, South Africa : implications for ore genesis and mineral exploration
(Stellenbosch : University of Stellenbosch, 2004-12)ENGLISH ABSTRACT: The Gamsberg Zn-Pb deposit is a metamorphosed and multiply deformed sediment-hosted base metal deposit in the central Namaqua Province of South Africa. The deposit is hosted by the Bushmanland Group, a ... -
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 ...
