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Gariep Complex

Namibia

Main commodities: Zn Pb
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A series of large zinc, lead and copper deposits are known over an interval of 500 km on the south-western and western margins of the Kaapvaal/Kalahari Craton in the Northern Cape Province of South Africa and in southern Namibia. These are found in both the late Palaeo- and Meso-Proterozoic metamorphics of the Namaqua Mobile Belt and in the late Neo-Proterozoic sediments and volcanics of the Gariep Province in Namibia.

The Namaqua Mobile Belt is part of an extensive U-shaped fringe that extends around the southern, western and northern margins of the Kaapvaal/Kalahari Province, from the Indian Ocean, to the Atlantic and back into central Africa and is composed of late Palaeo-Proterozoic and Meso-Proterozoic gneisses, schists and granitoids after volcanics, sediments and intrusives that were metamorphosed in the late Meso-Proterozoic from 1200-1000 Ma. These rocks in part form the basement to the Damara-Katangan that hosts the deposits of Module 1 Part A.

The Gariep, an inlier on the western margin of the Kalahari Craton along the Atlantic coast, is part of the Damaran-Katangan System, resting unconformably on Namaqualand metamorphics and intrusives. These comprise a variety of sediments from mixtites through arenites and argillites to carbonates, with variable but generally lesser mafic rocks, and felsite-rhyolite volcanics.

The western segment of the Kalahari Craton to the north and east of the Namaqua Mobile Belt and Gariep Complex is occupied by a thick sequence of poorly deformed volcanics and intrusives, the Rehoboth Complex of granitic, intrusives cutting volcanics of from andesitic to acid composition with intercalated sediments ranging from 1700 to possibly 1050 Ma in age. These are in part equivalent to the metamorphosed volcanics and sediments of parts of the Namaqua Mobile Belt

The most recent source geological information used to prepare this summary was dated: 2001.    
This description is a summary from published sources, the chief of which are listed below.
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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