Petrochemical and mineralogical relationships in the Koperberg Suite, Namaqualand, South Africa

Petrochemical and mineralogical relationships in the Koperberg Suite, Namaqualand, South Africa

The anorthositic to noritic Koperberg suite is distinguished by a dispersed mode of occurrence and primary copper sulphides. Petrographic variation is mainly caused by change in the relative proportions of three rock-forming minerals: andesine orthopyroxene and brown mica. Average major-element chem...

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Veröffentlicht in:The American mineralogist 1990-02, Vol.75 (1-2), p.27-36
Hauptverfasser: Schoch, Aylva E, Conradie, Johan A
Format: Artikel
Sprache:eng
Schlagworte:
Africa
anorthosite
Cape Province region
Cape Province South Africa
chemical composition
copper ores
crust
differentiation
fractional crystallization
gabbros
geochemistry
igneous and metamorphic rocks
igneous rocks
Koperberg Suite
magmas
metal ores
mineral composition
Namaqualand
norite
Okiep copper district
Petrology
plutonic rocks
pollution
rock, sediment, soil
South Africa
Southern Africa
trace elements
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Zusammenfassung:The anorthositic to noritic Koperberg suite is distinguished by a dispersed mode of occurrence and primary copper sulphides. Petrographic variation is mainly caused by change in the relative proportions of three rock-forming minerals: andesine orthopyroxene and brown mica. Average major-element chemical compositions are calculated for the principal rock types.
ISSN:0003-004X
1945-3027