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Meteorite Kr in Earth’s mantle suggests a late accretionary source for the atmosphere

Holland, Greg and Ballentine, Chris and Cassidy, Martin (2009) Meteorite Kr in Earth’s mantle suggests a late accretionary source for the atmosphere. Science, 326 (5959). pp. 1522-1525. ISSN 0036-8075

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Noble gas isotopes are key tracers of both the origin of volatiles found within planets and the processes that control their eventual distribution between planetary interiors and atmospheres. Here, we report the discovery of primordial Kr in samples derived from Earth’s mantle and show it to be consistent with a meteorite or fractionated solar nebula source. The high-precision Kr and Xe isotope data together suggest that Earth’s interior acquired its volatiles from accretionary material similar to average carbonaceous chondrites and that the noble gases in Earth’s atmosphere and oceans are dominantly derived from later volatile capture rather than impact degassing or outgassing of the solid Earth during its main accretionary stage.

Item Type: Journal Article
Journal or Publication Title: Science
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 55273
Deposited By: ep_importer_pure
Deposited On: 20 Jun 2012 15:02
Refereed?: Yes
Published?: Published
Last Modified: 20 Mar 2018 05:43
Identification Number:

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