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A cratonic foreland model for Witwatersrand Basin development in a continental back-arc, plate-tectonic setting

de la Rey Winter, H

South African Journal of Geology/Suid-Afrikaanse Tydskrif vir Geologie, 1987-12, Vol.90 (4), p.409-427

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Título:
A cratonic foreland model for Witwatersrand Basin development in a continental back-arc, plate-tectonic setting
Autor: de la Rey Winter, H
Assuntos: Marine
É parte de: South African Journal of Geology/Suid-Afrikaanse Tydskrif vir Geologie, 1987-12, Vol.90 (4), p.409-427
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: Some definitive features of Witwatersrand Basin development are: its asymmetric shape and taper away from its depo-axis; early compression along a foredeep, from the positive side of which most of the sedientation was derived; marginal unconformities; progressive basinward advance of depo-axes, with consequent coarsening-up facies; and regular isopachs uninterrupted by rifting. A typical cratonic foreland basin is described by the Witwatersrand Supergroup. The taphrogenic model, with concurrently rising granite domes and interfering folding directions persisting through time, is discarded. Phanerozoic back-arc basins are remarkably similar to the Witwatersrand in their style of evolution, deformation, and regional geological setting. Analogous back-arc regional characteristics of alternating compressional and extensional periods, with volcanism increasing towards the magmatic arc, rising arc isotherms, plutonism, and uplift also typify the Witwatersrand and the succeeding Ventersdorp geology in the hinterland to the north and west.
Idioma: Inglês

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