Geochemical evolution and tectonic significance of boninites and tholeiites from the Koh ophiolite, New Caledonia

Article Abstract:

The Koh ophiolite was formed by two tholeiitic processes interspersed with the formation of boninites. The first tholeiitic phase involved the formation of gabbros, dolerites, and plagiogranites. The second event of tholeiitic magmatism occurred during the early rifting history of modern back arc basins. The boninites were produced after the formation of the back arc basin crusts. The coarse calc-alkaline arc-derived sediments in Koh and other ophiolites suggest that the crust was near arc volcanoes.

Analysis, Natural history, New Caledonia, Ophiolites

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The Carolina terrane in northwestern South Carolina, U.S.A.: Late Precambrian-Cambrian deformation amd metamorphism in a peri-gondwanan ocean arc

Article Abstract:

The Carolina terrane consists of an exotic volcanic island arc with its western portions comprising zoned mafic-ultramafic plutonic complexes. It is believed that intra-arc rifting and regional metamorphism and foliation development occured between 580 and 535 Ma. Petragraphic and Ar-Ar studies support subsequent middle to late Paleozoic regional metamorphic overprints, but undeformed, unmetamorphosed intrusion suggests late Precambrina-Early Cambrian.

Precambrian Era

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Cambrian arc evolution along the SE Gondwana active margin: A synthesis from Tasmania-New Zealand-Australia-Antarctica correlations

Article Abstract:

Cambrian arc evolution over the SE Congwana active margin is discussed.

Cambrian period

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