Igneous rock associations 8. Arc magmatism II: geochemical and isotopic characteristics.(Series)

Geoscience Canada | March 1, 2007| | Copyright

SUMMARY

Geochemical and isotopic data provide insights into the origin and evolution of magmatism found at destructive plate margins. Tholeiitic magmas are dominant in the early stages of oceanic island-arc genesis and calc-alkalic magmas are most common in mature oceanic arcs and in continental arcs where they may range from basalt to rhyolite in composition, including voluminous intermediate (andesitic) rocks. Experiments suggest that calc-alkalic mafic magmas are formed by melting of a hydrated mantle wedge and undergo low pressure fractional crystallization ...

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