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Variations in Isochore Thickness of the Ecca Sediments in the Eastern Cape Province of South Africa, as Deduced from Gravity Models
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The authors acknowledge the National Research Foundation (NRF) (Grant UID: 101980) and Govan Mbeki Research and Development Centre (GMRDC), University of Fort Hare for financial support. Our sincere gratitude goes to the Council for Geoscience, South Africa for supplying the gravity data. Geosoft is also appreciated for providing the “Extended GM-SYS” that was used for the modelling. We thank the editors and anonymous reviewers for their constructive comments, which helped us to improve the manuscript.

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    Abstract:

    Gravity modelling was carried out along five profiles that traverse the Eastern Cape Province of South Africa in order to determine the depositional surface and isochore thickness of the Ecca sediments. Gravity models of the subsurface rock density reveal that the Ecca Group has a maximum vertical thickness of about 3215 ± 160 m. The maximum depositional surface (elevation) above sea level for the Ecca sediments is about 500 m, whilst the depth below sea level reaches about 10000 m. Correlation of the isochore thickness maps with the depositional surfaces shows that the sediments in the basement highs were subsided, deformed, eroded and deposited in the basement lows. The basement highs served as the source area(s) for the sediments in the basement lows, thus basement highs are characterized with thin sediment cover whilst the lows have thick sediment cover.

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Christopher BAIYEGUNHI, Oswald GWAVAVA.2016. Variations in Isochore Thickness of the Ecca Sediments in the Eastern Cape Province of South Africa, as Deduced from Gravity Models[J]. Acta Geologica Sinica(),90(5):1699-1712

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History
  • Received:March 03,2015
  • Revised:August 17,2015
  • Online: October 20,2016
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