Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6438623 | Geochimica et Cosmochimica Acta | 2014 | 19 Pages |
Abstract
Most Apollo 17 samples examined here and in prior studies are characterized by very similar HSE signatures, consistent with a common impactor. These samples are characterized by elevated Ru/Ir, Pd/Ir, and Re/Os, relative to most chondrites. Collectively, the data indicate that the impactor was characterized by the following HSE ratios (2Ï): Re/Ir 0.093 ± 0.020, Os/Ir 1.03 ± 0.28, Ru/Ir 1.87 ± 0.30, Pt/Ir 2.36 ± 0.31, Pd/Ir 1.85 ± 0.41, and present-day 187Os/188Os of 0.1322 ± 0.0013. The results most likely mean that the impactor was a body with a bulk composition that was just outside the range of meteoritic compositions currently sampled on Earth.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geochemistry and Petrology
Authors
Miriam Sharp, Iva Gerasimenko, Lorne C. Loudin, Jingao Liu, Odette B. James, Igor S. Puchtel, Richard J. Walker,