Vredefort core: a cross-section of the upper crust?

Details Vredefort core: a cross-section of the upper crust? Vredefort core: a cross-section of the upper crust?

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..117s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Issue 1, pp.117-121

Physics

8

Scientific paper

Sixty-three samples from the granitic core of the Vredefort ring structure have been analyzed for K, Rb, and Sr. The Sr 87 / Sr 86 ratios were determined for thirteen of these. An isochron yielding an age of 2.85 × 10 9 yr was obtained. The Rb / Sr and K / Rb 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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