Department of Earth Sciences

Role of myrmekites and associated deformation fabrics in controlling development of granitic mylonites in the Pofadder Shear Zone, Southern Namibia

Cisneros Lazaro, Deyanira Graciela (Stellenbosch : Stellenbosch University, 2019-04)

ENGLISH ABSTRACT: The predominantly granitic Pofadder Shear Zone (PSZ) of southern Namibia is a crustal-scale dextral shear zone exhumed from the brittle-ductile transition. A variably deformed megacrystic granite with ...

Geochronology and isotopic characterisation of LCT pegmatites from the Orange River Pegmatite Province

Doggart, Shane William (Stellenbosch : Stellenbosch University, 2019-04)

ENGLISH ABSTRACT: The pegmatites of the Orange River Pegmatite Belt (ORPB) form an extensive, ca. 450km long continuous W-E trending belt extending from Vioolsdrif to Kenhardt in South Africa, with the northern extent ...

Genesis and evolution of a Neoproterozoic magmatic arc: the cordilleran-type granitoids of the Araçuaí Belt, Brazil.

Narduzzi, Francesco (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 ...

A Fundamental study on the effects of cation substitution on the molecular chemistry and surface reactivity of sphalerite

Babedi, Lebogang (Stellenbosch : Stellenbosch University, 2018-12)

ENGLISH ABSTRACT: Sphalerite exhibits multiple flotation responses because of its intricate mineral chemistry which arises from its ability to incorporate different metal impurities. Historical work has focussed largely ...

Geochemical analysis of stream responses to changes in land development and seasonal variation, Western Cape, South Africa

Lazarus, Louis Reuben (Stellenbosch : Stellenbosch University, 2018-11-19)

ENGLISH ABSTRACT: It is generally accepted that poor riparian land-use practices, commonly associated with agricultural, urban and industrial sectors, have a negative effect upon the geochemical state of streams. The Western ...

Structural controls of auriferous reefs at Fairview Mine, Barberton Greenstone Belt, South Africa

Gloyn-Jones, Jonathan (Stellenbosch : Stellenbosch University, 2018-11-19)

ENGLISH ABSTRACT: Auriferous shear zone hosted gold mineralization at Fairview Mine, along the central-northwestern margin of the Mesoarchean Barberton Greenstone Belt (BGB), is correlated with regional-scale fluid migration ...

Phytoplankton variability in the Atlantic and Indian sectors of the Southern Ocean: a biogeochemical approach

Weir, Ian (Stellenbosch : Stellenbosch University, 2018-11-16)

ENGLISH ABSTRACT: The Southern Ocean is identified as a key component in the global carbon cycle due to a unique combination of physical circulation and biological processes. In light of a predicted changing climate, ...

Radiometric dating and stratigraphic reassessment of the Elliot and Clarens formations; near Maphutseng and Moyeni, Kingdom of Lesotho, southern Africa

Rademan, Zandri (Stellenbosch : Stellenbosch University, 2018-10-15)

ENGLISH ABSTRACT: The Elliot and Clarens formations (Stormberg Group) of the Karoo Supergroup famously preserve not only a dynamic suite of depositional environments spanning the Late Triassic to Early Jurassic, but also ...

CHEMTAX determination of Southern Ocean phytoplankton distribution and adaption: An observational and experimental study assessing the co-limitation of Light, Iron and other Trace Metals on phytoplankton productivity and community composition.

Viljoen, Johannes Jacobus (Stellenbosch : Stellenbosch University, 2018-12)

ENGLISH ABSTRACT: This multi-manuscript study reports an elucidated understanding of the consequences key environmental changes has on phytoplankton community structure, productivity and their acclimation abilities for the ...

Evolution of the continental crust and significance of the zircon record, a case study from the French Massif Central.

Couzinie, Simon Gwenael (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 ...

An experimental investigation of the “fate” of entrained peritectic minerals during adiabatic ascent of S-type granite magmas

Mthethwa, Mbali Pertunia (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 ...

36 Chlorine isotope systematics in saline groundwater in the Buffels River Valley

Van Gend, Jani (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 ...

Understanding Mg isotope systematics of variably saline water along the west coast of southern Africa

Petronio, Alice Lea (Stellenbosch : Stellenbosch University, 2018-03)

ENGLISH ABSTRACT: Isotope techniques are a highly effective tool for fulfilling critical hydrologic information and are therefore crucial for supporting effective water management. The most frequently used isotopes ...

Deep groundwater characterisation and recharge estimation in the Verlorenvlei catchment

Eilers, Anya (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 ...

Geochemical and isotopic tracing of salinity loads into the Ramsar listed Verlorenvlei freshwater estuarine lake, Western Cape, South Africa

Sigidi, Nthabeliseni Thendo (Stellenbosch : Stellenbosch University, 2018-03)

ENGLISH ABSTRACT: The Verlorenvlei estuarine lake is a natural, semi-fresh lake along the West Coast of South Africa. The lake is situated in a semi-arid region, and is subject to high evaporation rates of up to 2400mm, ...

An investigation of the petrogenesis of the Buddusò I-type granites and its mafic enclaves in Sardinia, Italy.

Soorajlal, Roxanne (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 ...

A petrographic and geochemical study of mafic sills within the Transvaal Supergroup, east of the Bushveld Igneous Complex

Netshidzivhe, Thendo (Stellenbosch : Stellenbosch University, 2017-12)

ENGLISH ABSTRACT: The marginal sills that intruded into the Transvaal Supergroup have long been used to infer the parental magmas of the Rustenburg layered suite (RLS) due to their geochemical similarities which they ...