Osmium isotopes as petrogenetic and geological tracers

Details Osmium isotopes as petrogenetic and geological tracers Osmium isotopes as petrogenetic and geological tracers

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..48..148a&link_type=abstract

Earth and Planetary Science Letters, Volume 48, Issue 1, p. 148-154.

Computer Science

41

Scientific paper

Using terrestrial osmium-enriched samples of known ages, we have shown that 187Os/186Os varies with time in result of the 187Re β- radioactivity. Such a variation in the earth's mantle can be fitted by a straight line corresponding to 187Re/186Os = 3.15 for the mantle, comparable to C1 carbonaceous chondrites. Using this result and the Re and Os contents of various rocks, several theoretical considerations and predictions can be deduced for the chemical evolution of the earth, such as a method for distinguishing between different processes of development of the continental crust. The special result of 187Os/186Os from Bushveld is discussed with respect to the possible existence of an ``enriched'' subcontinental mantle.

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