Low abundances of highly siderophile elements in the lunar mantle: evidence for prolonged late accretion

Abundances of the highly siderophile elements (HSE) Re, Ir, Os, Ru, Pt and Pd were determined for etchates and residues of highly purified lunar orange (74220 and 74001,1217 and 1218) and green (15421,65 and 15426,164) volcanic glasses. Most etchates have >100 pg/g Os and Ir, and in some instance...

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Bibliographic Details
Published in:Earth and planetary science letters 2004-08, Vol.224 (3), p.399-413
Main Authors: Walker, R.J., Horan, M.F., Shearer, C.K., Papike, J.J.
Format: Article
Language:English
Subjects:
Apollo 15
Apollo 17
highly siderophile elements
late accretion
lunar crust
lunar mantle
osmium isotopes
volcanic glasses
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Summary:Abundances of the highly siderophile elements (HSE) Re, Ir, Os, Ru, Pt and Pd were determined for etchates and residues of highly purified lunar orange (74220 and 74001,1217 and 1218) and green (15421,65 and 15426,164) volcanic glasses. Most etchates have >100 pg/g Os and Ir, and in some instances have HSE concentrations that approach chondritic relative abundances. Some etchates also have 187Os/ 188Os within the range of chondritic meteorites. In contrast, most residues have Os concentrations of
ISSN:0012-821X
1385-013X
DOI:10.1016/j.epsl.2004.05.036