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- W1911399306 abstract "Archean sediments intercalated within the lower volcanic interval in the Barberton Mountain Land and Pilbara Block accumulated in an anorogenic, shallow-oceanic environment distant from a continental influence. Overlying terrigenous sediments represent continental margin deposits: in South Africa, terrigenous influx across oceanic crust was in response to crustal shortening and uplift of gneisses to the south. Both steep and shelf-rimmed continental margins are recognized. In South Africa, sedimentation was terminated by ocean closure through the northward advance of the zone of crustal shortening. The late-Archean Pongola Supergroup is interpreted as a response 10 this closure with sedimentation taking place in a cratonic shelf basin to the south. The lower Proterozoic witwatersrand and Transvaal Supergroups likewise accumulated in cratonic shelf basins with sediment derived from the north. Terrigenous sediment was supplied by fluvial systems but the dominant mode of sedimentation in lhe pericratonic seas was tida I and took place during prolonged periods of submergence of the Kaapvaal Province. Offshelf basinal equivalents are not recognized for these cratonic sequences. Intracratonic rift basins are represented by the Ventersdorp Supergroup and Soutpansberg Group and are also developed at the base of the Hamersley basin. A third style of lower Proterozoic sedimentation is represented by the chemical sedimentary unit in the Transvaal basin. A basal ramp margin developed after initial drowning of the Kaapvaal Province and evolved into a rimmed shelf margin. ln the latter, platform tidal flat and subtidal stromatolitic assemblages pass laterally into high-energy oolitic and stromatolitic plutform-edge facies. Basinal equivalents are present and consist of non-stromatolitic, ferruginous dolomite and limestone, mudstone, chert and finely-laminated iron-formation. The Hamersley Group is a lithologic equivalent of the basinal facies. Platform fades are poorly-represented in Australia, and comprise the thin Carawine Dolomite in the eastern Pilbara Block." @default.
- W1911399306 created "2016-06-24" @default.
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- W1911399306 date "1982-01-01" @default.
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- W1911399306 title "ARCHEAN AND EARLY PROTEROZOIC SEDIMENTATION STYLES IN THE KAAPVAAL PROVINCE, SOUTH AFRICA AND PILBARA BLOCK, AUSTRALIA" @default.
- W1911399306 doi "https://doi.org/10.5327/rbg.v12i1-2-3.253" @default.
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