Tholeiitic volcanic rocks of the late Archean Blake River Group, southern Abitibi greenstone belt: origin and geodynamic implications
作者： M. R. Laflèche , C. Dupuy , J. Dostal
DOI: 10.1139/E92-116
关键词: Fractional crystallization (geology) 、 Greenstone belt 、 Archean 、 Petrology 、 Geochemistry 、 Basalt 、 Volcanic rock 、 Trace element 、 Volcano 、 Progressive change 、 Geology 、 General Earth and Planetary Sciences
摘要: The late Archean Blake River Group volcanic sequence forms the uppermost part of the southern Abitibi greenstone belt in Quebec. The group is mainly composed of mid-ocean-ridge basalt (MORB)-like tholeiites that show a progressive change of several incompatible trace element ratios (e.g., Nb/Th, Nb/Ta, La/Yb, and Zr/Y) during differentiation. The compositional variations are inferred to be the result of fractional crystallization coupled with mixing–contamination of tholeiites by calc-alkaline magma which produced the mafic–intermediate lavas intercalated with the tholeiites in the uppermost part of the sequence. The MORB-like tholeiites were probably emplaced in a back-arc setting.
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