Original Research

The Timbavati Gabbro of the Kruger National Park

F. Walraven
Koedoe | Vol 29, No 1 | a521 | DOI: https://doi.org/10.4102/koedoe.v29i1.521 | © 1986 F. Walraven | This work is licensed under CC Attribution 4.0
Submitted: 27 November 1986 | Published: 27 November 1986

About the author(s)

F. Walraven, Geological Survey of South Africa, South Africa

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Abstract

The structure, geochemistry and isotope geochemistry of the Timbavati Gabbro, a suite of basic, intrusive sills located within and outside the Kruger National Park, are discussed. The available information is integrated into a single genetic model for the Timbavati intrusions @ this model involves melting of upper mantle material and accumulation of the magma in an intermediate magma chamber from which batches of magma escaped at various times to form the different phases of the Timbavati Gabbro. Both fractional crystallisation and assimilation of country rock played a part in the geochemical evolution of the Timbavati Gabbro. The age of the Timbavati Gabbro appears to be quite young, predating the rocks of the Karoo Sequence by a relatively short time.

Keywords

Timbavati Gabbro, petrogenesis, basic rocks, geochronology, geochemistry, structure, olivine gabbro, gabbro, quartz gabbro.

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