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Namaqua Complex |
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Northern Cape, South Africa |
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Zn Pb Cu
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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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 decription was dated: 2001.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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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, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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