Archean Greenstone Belts Do Contain Fragments of Ophiolites
作者： Maarten J. de Wit
DOI: 10.1016/S0166-2635(04)13018-1
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摘要: Publisher Summary A vast number of geochemical analyses indicate that oceanic-like (MORB-type) basalts and alpine-type peridotites occur in a large the studied greenstone belts. The Kam Group circa 2.7 Ga Yellowknife belt is probably best known for its extensive sheeted dyke complex displays gradual transition onto overlying tholeiitic pillow lavas grades downward into isotropic fine-grainedmetagabbros. ophiolitic units are believed to be part regional assemblages throughout Kalgoorlie terrane. Barberton comprises at least 3 major allochthonous thrust sheets with predominantly mafic-ultramafic rock assemblages. significant studies on Archean eclogite peridotite xenoliths found kimberlites related rocks, derived from mantle lithosphere underlying cratons have been equated grounds subducted metamorphosed oceanic crust. belts contain amount basalts. absence volumes gabbros indicates mafic melts spend little time magma chambers construct middle section This complements generally high-Mg content many
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