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The geology of the Vredefort dome (explanation of sheets 2627CA, CB, CD, DA, DC, 2727AA, AB, BA - Scale 1 : 50000)
Vredefort dome (explanation of geological sheets 2627CA, CB, CC, CD, DA, DC and 2727AA, AB, BA (1 : 50000))
Bisschoff A. A. ; Mayer J. J. (Collaborateur)
Corporation(s) du ou des auteurs
Council for Geoscience INC (Editeur scientifique)
The Vredefort Structure is a ring structure which is elongated toward the southeast and is covered, in this direction, by Karoo-age sediments. Detailed mapping, carried out over the past decade, has indicated that its central core comprises Archaean gneiss and granulite (Inlandsee Gneiss), surrounded by a younger, more homogeneous granite and gneiss (Parys Granite). These rock types are separated by a zone of high-grade metamorphic rocks (the Steynskraal Metamorphic Suite) comprising migmatite, aluminous gneisses, granulite and charnockite of the granulite facies. Two large bodies of greenstone (Greenlands Formation) occur within the Parys Granite. The core of granite-gneiss is enveloped by a collar of sediments and lavas which progressively becomes younger towards the outer perimeters of the ring and ranges from Archaean to Early Proterozoic in age. They mostly dip steeply and are overturned in places. Basic lavas of the Dominion Group occur at the base of the collar, and are overlain by quartzite, shale, conglomerate and subordinate lava of the Witwatersrand Supergroup. Although lithostratigraphic terminology has not been finalised for the Witwatersrand succession in the Vredefort area, it is nevertheless possible to correlate successions of this area with those of the Central Rand and Klerksdorp areas down to the level of subgroups. The West Rand Group can accordingly be subdivided into the Hospital Hill, Govemment and Jeppestown Subgroups, each containing a number of char
Geological Survey of South Africa
ISSN : ISBN : 1-875061-60-6
A. 1999, [IV, 49 p.] [Illustrations : Illustration] [bibl. : 2 p.1/2]
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