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Parental magma to the Bushveld Complex

Naturevolume 287pages3335 (1980) | Download Citation

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Abstract

The Bushveld Complex of South Africa is a large layered intrusive suite of cumulate rocks for which the parental magma is not directly obtainable. However, we report here indirect evidence from a suite of fine-grained sills in the sediments below the Bushveld Complex. Mineralogical, geochemical and experimental petrological data are consistent with their being representative of the parental magma. They are siliceous picrites (SiO2 = 55%; MgO = 12%), high in Cr, Ni, Rb and K, and with a high initial Sr87/Sr86 ratio, and hence represent a rather unusual magma composition. Crustal contamination may have been important in their evolution.

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Affiliations

  1. Geology Department, University of the Witwatersrand, 1 Jan Smuts Avenue, Johannesburg, 2001, South Africa

    • G. Davies
    • , R. Grant Cawthorn
    •  & Merryl Morton
  2. Bernard Price Institute of Geophysical Research, University of the Witwatersrand, 1 Jan Smuts Avenue, Johannesburg, 2001, South Africa

    • J. M. Barton Jr

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https://doi.org/10.1038/287033a0

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