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

Dale, C.W. and Burton, K.W. and Greenwood, R.C. and Gannoun, A. and Wade, J. and Wood, B.J. and Pearson, D.G. (2012) 'Late accretion on the earliest planetesimals revealed by the highly siderophile elements.', Science., 336 (6077). pp. 72-75.

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.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1126/science.1214967
Publisher 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
Date accepted:No date available
Date deposited:26 April 2013
Date of first online publication:April 2012
Date first made open access:No date available

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