Open AccessThe Timbavati Gabbro of the Kruger National Park
Author(s) -
F. Walraven
Publication year - 1986
Publication title -
koedoe
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.419
H-Index - 29
eISSN - 2071-0771
pISSN - 0075-6458
DOI - 10.4102/koedoe.v29i1.521
Subject(s) - gabbro , geology , geochemistry , magma chamber , sill , magma , fractional crystallization (geology) , mantle (geology) , petrology , igneous rock , volcano
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