Other
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.1421m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 55, Issue 5, pp.1421-1434
Other
35
Scientific paper
Osmium isotopic compositions and Re and Os concentrations have been determined on ultramafic and mafic rocks derived from the contemporary mantle. These samples have a large range in measured 187 Os / 186 Os (1.0032 to 1.173). Peridotites from the Southwest Indian Ridge and Zabargad Island (Red Sea) and cumulate chromitites from Zambales ophiolite (Philippines) range in 187 Os / 186 Os from 1.083 to 1.0032. Ocean island basalts (OIBs) from Hawaii and Iceland considered to be representative of a distinct plume-source mantle have 187 Os / 186 Os of about 1.10. Other OIBs which have high 187 Os / 186 Os of 1.151 require involvement of at least one additional component with a different Os isotopic composition in their formation. The observed range in Os isotopic composition is consistent with an average silicate earth 187 Os / 186 Os of 1.10. This value is higher than the value determined by and (1980) but is within the range observed in meteorites. In this case, all the analyzed suboceanic peridotites as well as subcontinental samples have been affected to varying degrees by Re depletion related to ancient melt extraction events which occurred in some regions of the mantle.
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