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- W202374171 abstract "The Bushveld Complex is a large magmatic province of uncertain origin. Its perceived immensity has attracted speculations of extraterrestrial origin by meteorite impact (Hamilton, 1970; Rhodes, 1975) or internal origin by mantle diapirism (Sharpe et al., 1981). Unsatisfactory as these apparently non-uniformitarian hypotheses may be, attempts to apply a uniformitarian plate tectonic hypothesis to the Bushveld Complex (Van Biljon, 1976; Hatton and Sharpe, 1989) are undermined by the demonstration that the Bushveld intrusives and associated volcanics are stratigraphically divorced from the underlying sediments (Schweitzer and Hatton, 1994). Plume tectonics are increasingly summonsed to account for unusual chemistries observed in Archaean komatites (Xie et al., 1993, McCuaig et al., 1994) and the associations of granite rocks with komatites (Hill et al., 1990), and may find application in the Bushveld Complex. Certain features of the Bushveld Complex are consistent with a plume origin. These are the radial distribution of intrusive centres and satellite bodies (Sharpe et al., 1981) and the increasing contribution of radiogenic Sr and Pb, possibly of crustal origin, during the evolution of the mafic intrusives (Kruger and Marsh 1982; Sharpe, 1985; Auret et al., 1989; Kruger, 1989). Accordingly this communication will attempt to assess the application of a plume hypothesis to the Bushveld complex. To that end the character of the Bushveld parental magmas and the interactions between them will be reviewed and the genesis of the chromite and PGEenriched layers will be considered in the framework of these interactions. The essential role that intrusion of colder magma plays in the genesis of these enriched layers and the possibility that plume tectonics might generate such cold magmas are the twin themes of this communication." @default.
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- W202374171 date "1995-01-01" @default.
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- W202374171 title "The Bushveld complex, a product of interaction among magmas derived from a mantle plume" @default.
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