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- W2068262764 abstract "Various hypotheses have been proposed for the evolution of the continental crust which incorporate different models of growth through geologic time. The most widely used and tested model is that of extensive growth by intracrustal melting, starting about 3.2 Ga ago (Taylor & McLennan, 1985). Ages of single, detrital zircons from various Witwatersrand stratigraphic horizons (Fig.l) indicate a general trend of decreasing ages of source rocks from about 3.2 to 3.1 Ga for the Dominion Reef to less than 2.8 Ga for the Ventersdorp Contact Reef (VCR). A small number of older zircons with ages between 3.2 and 3.5 Ga occur in most sediments. There also appears to exist a gap in zircon ages at about 3.26 Ga indicating the end of an older tectonic cycle. A major new cycle of crustal evolution appears to have started at about 3.1 to 3.0 Ga, judging from the appearance of large numbers of detrital zircons of that age in Witwatersrand sediments ( Barton, E.S. and Hallbauer, D.K., unpublished data). Evidence for crusta l evolut ion in the Witwatersrand source region is also available from a different avenue, the geochemistry of quartz. On average, quartz is the major component of Witwatersrand sediments and quartz pebbles of the 'vein quartz' type are a prominent component of most conglomerate horizons. More than 200 single pebbles from different reefs and quartz from some primary sources have" @default.
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- W2068262764 date "1994-01-01" @default.
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- W2068262764 title "Crustal Evolution in the Source Region of the Witwatersrand Sediments, South Africa — Evidence from Quartz Pebble and Quartzite Geochemistry" @default.
- W2068262764 cites W1624806571 @default.
- W2068262764 doi "https://doi.org/10.1180/minmag.1994.58a.1.191" @default.
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