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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Selenium isotopes as tracers of a late volatile contribution to Earth from the outer Solar System
Nature Geoscience, Volume 12, No. 9, Year 2019
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Description
The origin of Earth’s volatiles has been attributed to a late addition of meteoritic material after core–mantle differentiation. The nature and consequences of this ‘late veneer’ are debated, but may be traced by isotopes of the highly siderophile, or iron-loving, and volatile element selenium. Here we present high-precision selenium isotope data for mantle peridotites, from double spike and hydride-generation multicollector inductively coupled plasma mass spectrometry. These data indicate that the selenium isotopic composition of peridotites is unaffected by petrological processes, such as melt depletion and melt-rock reaction, and thus a narrow range is preserved that is representative of the silicate Earth. We show that selenium isotopes record a signature of late accretion after core formation and that this signature overlaps only with that of the CI-type carbonaceous chondrites. We conclude that these isotopic constraints indicate the late veneer originated from the outer Solar System and was of lower mass than previously estimated. Thus, we suggest a late and highly concentrated delivery of volatiles enabled Earth to become habitable. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
Authors & Co-Authors
Varas-Reus, Maria Isabel
Germany, Tubingen
Eberhard Karls Universität Tübingen
König, Stephan
Germany, Tubingen
Eberhard Karls Universität Tübingen
Yierpan, Aierken
Germany, Tubingen
Eberhard Karls Universität Tübingen
Lorand, Jean Pierre
France, Nantes
Laboratoire de Planétologie et Géodynamique
Schoenberg, Ronny
Germany, Tubingen
Eberhard Karls Universität Tübingen
Statistics
Citations: 38
Authors: 5
Affiliations: 2
Identifiers
Doi:
10.1038/s41561-019-0414-7
ISSN:
17520894