Vredefort core: a cross-section of the upper crust? |
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Authors: | WF Slawson |
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Institution: | Bernard Price Institute for Geophysical Research, University of Witwatersrand, Johannesburg, Republic of South Africa |
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Abstract: | Sixty-three samples from the granitic core of the Vredefort ring structure have been analyzed for K, Rb, and Sr. The ratios were determined for thirteen of these. An isochron yielding an age of 2.85 × 109 yr was obtained. The and ratios exhibit a ‘bulls-eye’ pattern in the granite suggesting the central portion has been extruded from depth. Diapiric flow and subsequent erosion has exposed a section of the continental crust within the Vredefort core. |
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