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Late Accretion on the Earliest Planetesimals Revealed by the Highly Siderophile Elements

Dale, Christopher W.; Burton, Kevin W.; Greenwood, Richard C.; Gannounn, Abdelmouheine; Wade, Jonathan; Wood, Bernard J. and Pearson, D. Graham (2012). Late Accretion on the Earliest Planetesimals Revealed by the Highly Siderophile Elements. Science, 336(6077) pp. 72–75.

DOI (Digital Object Identifier) Link: https://doi.org/10.1126/science.1214967
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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: Journal Item
Copyright Holders: Unknown
ISSN: 1095-9203
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 44797
Depositing User: Richard Greenwood
Date Deposited: 12 Nov 2015 14:21
Last Modified: 07 Dec 2018 10:36
URI: http://oro.open.ac.uk/id/eprint/44797
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