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Osmium isotope constraints on Earth's late accretionary history

January 1, 1985

Osmium isotope measurements reported by Alle??gre and Luck 1,2 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. I have now examined the available data in more detail and conclude 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. ?? 1985 Nature Publishing Group.

Citation Information

Publication Year 1985
Title Osmium isotope constraints on Earth's late accretionary history
DOI 10.1038/317703a0
Authors J. W. Morgan
Publication Type Article
Publication Subtype Journal Article
Series Title Nature
Index ID 70013130
Record Source USGS Publications Warehouse