A Major Archean, Gold- and Crust-Forming Event in the Kaapvaal Craton, South Africa

Details A Major Archean, Gold- and Crust-Forming Event in the Kaapvaal Craton, South Africa A Major Archean, Gold- and Crust-Forming Event in the Kaapvaal Craton, South Africa

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sci...297.1856k&link_type=abstract

Science, Volume 297, Issue 5588, pp. 1856-1858 (2002).

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Scientific paper

The 2.89- to 2.76-gigayear-old conglomerates of the Central Rand Group of South Africa host an immense concentration of gold. The gold and rounded pyrites from the conglomerates yield a rhenium-osmium isochron age of 3.03 +/- 0.02 gigayears and an initial 187Os/188Os ratio of 0.1079 +/- 0.0001. This age is older than that of the conglomerates. Thus, the gold is detrital and was not deposited by later hydrothermal fluids. This Middle Archean gold mineralization event corresponds to a period of rapid crustal growth in which much of the Kaapvaal craton was formed and is evidence for a significant noble metal flux from the mantle.

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