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Now showing items 11-20 of 34
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 ...
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 ...
Provenance of alluvial diamonds in Southern Africa : a morphological and mineral chemistry study of diamonds and related heavy minerals from the Vaalorange system and the West Coast
(Stellenbosch : Stellenbosch University, 2012-03)
ENGLISH ABSTRACT: The discovery of lucrative diamond deposits along the west coast of Southern Africa
about 1200 kilometres from the Kimberley region during the period 1908 to 1927,
gave rise to a number of different ...
The anatectic history of Archaean metasedimentary granulites from the Ancient Gneiss Complex, Swaziland
(Stellenbosch : Stellenbosch University, 2012-03)
ENGLISH ABSTRACT: This study is an investigation of the anatectic history of high-grade paragneisses from the Ancient
Gneiss Complex (AGC) in Swaziland. The work involved an integrated field, metamorphic,
geochemical, ...
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 ...
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 ...
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 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 Darling granite batholith
(Stellenbosch : Stellenbosch University, 1972-09)
The Darling batholith is characterised by large scale hybridisation,
but mainly consists of the coarsely porphyritic
Darling granite. This granite changes gradationally into a
biotite-rich variety which occupies a roughly ...
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 ...