The Osmium Mantle Evolution Curve and Limits on Accretion and Differentiation of the Earth from Archean (3.4 - 3.8 Ga) Ultramafic Rocks
Initial 187Os/188Os isotopic compositions for geochronologically and geologically well -constrained 3.8-Ga spinel peridotites from the Itsaq Gneiss Complex of southern West Greenland and chromite separates from 3.46-Ga komatiites from the Pilbara region of Western Australia have been determined to investigate the osmium isotopic evolution of the early terrestial mantle. The measured compositions of 187Os/188Os(0) = 0.10262 ± 2, from an olivine separate, and 0.10329 ± 3, for a spinel separate...[Show more]
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|Source:||Geochimica et Cosmochimica Acta|
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