Oxidation of the deep big mantle wedge by recycled carbonates: Constraints from highly siderophile elements and osmium isotopes

2021 ◽  
Author(s):  
Ronghua Cai ◽  
Jingao Liu ◽  
D. Graham Pearson ◽  
Dongxu Li ◽  
Yong Xu ◽  
...  
Keyword(s):  
Mantle Wedge ◽  
Highly Siderophile Elements ◽  
Siderophile Elements ◽  
Osmium Isotopes

scholarly journals Diverse impactors in Apollo 15 and 16 impact melt rocks: Evidence from osmium isotopes and highly siderophile elements

2015 ◽  
Vol 155 ◽  
pp. 122-153 ◽  
Author(s):  
Jingao Liu ◽  
Miriam Sharp ◽  
Richard D. Ash ◽  
David A. Kring ◽  
Richard J. Walker
Keyword(s):  
Impact Melt ◽  
Highly Siderophile Elements ◽  
Siderophile Elements ◽  
Osmium Isotopes

Stochastic Late Accretion to Earth, the Moon, and Mars

Science ◽  
2010 ◽  
Vol 330 (6010) ◽  
pp. 1527-1530 ◽  
Author(s):  
William F. Bottke ◽  
Richard J. Walker ◽  
James M. D. Day ◽  
David Nesvorny ◽  
Linda Elkins-Tanton
Keyword(s):  
Size Distribution ◽  
Asteroid Belt ◽  
The Moon ◽  
Core Formation ◽  
Highly Siderophile Elements ◽  
Earth’S Mantle ◽  
Distribution Matching ◽  
Siderophile Elements ◽  
Impact Basins

Core formation should have stripped the terrestrial, lunar, and martian mantles of highly siderophile elements (HSEs). Instead, each world has disparate, yet elevated HSE abundances. Late accretion may offer a solution, provided that ≥0.5% Earth masses of broadly chondritic planetesimals reach Earth’s mantle and that ~10 and ~1200 times less mass goes to Mars and the Moon, respectively. We show that leftover planetesimal populations dominated by massive projectiles can explain these additions, with our inferred size distribution matching those derived from the inner asteroid belt, ancient martian impact basins, and planetary accretion models. The largest late terrestrial impactors, at 2500 to 3000 kilometers in diameter, potentially modified Earth’s obliquity by ~10°, whereas those for the Moon, at ~250 to 300 kilometers, may have delivered water to its mantle.

scholarly journals Highly siderophile elements mobility in the subcontinental lithospheric mantle beneath southern Patagonia

Lithos ◽  
2018 ◽  
Vol 314-315 ◽  
pp. 579-596 ◽  
Author(s):  
Santiago Tassara ◽  
José M. González-Jiménez ◽  
Martin Reich ◽  
Edward Saunders ◽  
Ambre Luguet ◽  
...  
Keyword(s):  
Lithospheric Mantle ◽  
Subcontinental Lithospheric Mantle ◽  
Highly Siderophile Elements ◽  
Southern Patagonia ◽  
Siderophile Elements
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