Osmium isotope constraints on earth's late accretionary history

Details Osmium isotope constraints on earth's late accretionary history Osmium isotope constraints on earth's late accretionary history

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.317..703m&link_type=abstract

Nature (ISSN 0028-0836), vol. 317, Oct. 24, 1985, p. 703-705.

Computer Science

23

Abundance, Chondrites, Earth Mantle, Osmium Isotopes, Planetary Evolution, Mass Spectroscopy, Rhenium

Scientific paper

Osmium isotope measurements reported by Allegre and Luck (1980, 1983) indicate that terrestrial osmiridiums evolved in a mantle source region in which the osmium/rhenium ratio falls strictly within the range found in chondrites. This suggests that the highly siderophile elements in the earth's mantle were introduced by a late influx of chondritic material and are not a result of endogenous processes. The available data have been examined in more detail, and it is concluded that the inferred Os/Re ratio of the earth's mantle matches the E group and C3 chondrites, but that C1 and probably C2 chondrites were not major components of the material accreted in the late stages of mantle formation.

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