Osmium isotope constraints on Earth's late accretionary history




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.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Osmium isotope constraints on Earth's late accretionary history
Series title Nature
DOI 10.1038/317703a0
Volume 317
Issue 6039
Year Published 1985
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Nature
First page 703
Last page 705