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Late accretion on the earliest planetesimals revealed by the highly siderophile elements

Dale, C.W.; Burton, K.W.; Greenwood, R.C.; Gannoun, A.; Wade, J.; Wood, B.J.; Pearson, D.G.

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Authors

C.W. Dale

R.C. Greenwood

A. Gannoun

J. Wade

B.J. Wood

D.G. Pearson



Abstract

Late accretion of primitive chondritic material to Earth, the Moon, and Mars, after core formation had ceased, can account for the absolute and relative abundances of highly siderophile elements (HSEs) in their silicate mantles. Here we show that smaller planetesimals also possess elevated HSE abundances in chondritic proportions. This demonstrates that late addition of chondritic material was a common feature of all differentiated planets and planetesimals, irrespective of when they accreted; occurring ≤5 to ≥150 million years after the formation of the solar system. Parent-body size played a role in producing variations in absolute HSE abundances among these bodies; however, the oxidation state of the body exerted the major control by influencing the extent to which late-accreted material was mixed into the silicate mantle rather than removed to the core.

Citation

Dale, C., Burton, K., Greenwood, R., Gannoun, A., Wade, J., Wood, B., & Pearson, D. (2012). Late accretion on the earliest planetesimals revealed by the highly siderophile elements. Science, 336(6077), 72-75. https://doi.org/10.1126/science.1214967

Journal Article Type Article
Publication Date Apr 1, 2012
Deposit Date Mar 14, 2012
Publicly Available Date Apr 26, 2013
Journal Science
Print ISSN 0036-8075
Electronic ISSN 1095-9203
Publisher American Association for the Advancement of Science
Peer Reviewed Peer Reviewed
Volume 336
Issue 6077
Pages 72-75
DOI https://doi.org/10.1126/science.1214967

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Copyright Statement
This is the author's version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science 336, 2012, doi:10.1126/science.1214967





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