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Mafic rocks of the Southern Appalachians; a review

1984; Yale University; Volume: 284; Issue: 4-5 Linguagem: Inglês

10.2475/ajs.284.4-5.294

1945-452X

K. C. Misra, H. Y. McSween,

Geochemistry and Geologic Mapping

Subaerially erupted metabasalts of tholeiitic affinity, which occur as conformable units in late Precambrian stratified sequences. Intrusive equivalents. Late Precambrian volcanism related to a divergent plate tectonic setting. Devonian Hillabee Greenstone complex (Talladega Belt) at the southwestern fringe of the Blue Ridge Belt shows tholeiitic and calc-alkaline affinities suggestive of a volcanic arc or actively developing continental margin environment. Metabasalts of tholeiitic affinity and probable late Precambrian age are also abundant in the Inner Piedmont Belt. Some of these (for example, the Dadeville Complex) are associated with younger but pre-metamorphic mafic intrusives. Mafic rocks of the Kings Mountain, Charlotte, and Carolina slate belts include metamorphosed late Precambrian to Cambrian basaltic flows and tuffs deposited in submarine environments and a large number of gabbroic complexes.--Modified journal abstract.