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| Detailed Reference Information |
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Martin, C.E. (1991). Osmium Isotopic Characteristics of Mantle-Derived Rocks. Geochimica et Cosmochimica Acta 55(5): 1,421-1,434. |
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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 Os-187/Os-186 (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 Os-187/Os-186 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 Os-187/Os-186 of about 1.10. Other OIBs which have high Os-187/Os-186 of greater-than-or-equal-to 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 Os-187/Os-186 of 1.10. This value is higher than the value determined by ALLEGRE and LUCK (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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Analytical Techniques |
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Analytical Techniques |
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Keywords
bouvet triple junction, manganese nodules, stillwater complex, hawaiian basalts, helium-isotopes, trace-elements, south-atlantic, loihi seamount, rhenium-osmium, red-sea |
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Publisher
Elsevier Science
P.O. Box 211
1000 AE Amsterdam
The Netherlands
(+31) 20 485 3757
(+31) 20 485 3432
nlinfo-f@elsevier.com |
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