182W evidence for long-term preservation of early mantle differentiation products

Science
Mathieu TouboulRichard J Walker

Abstract

Late accretion, early mantle differentiation, and core-mantle interaction are processes that could have created subtle (182)W isotopic heterogeneities within Earth's mantle. Tungsten isotopic data for Kostomuksha komatiites dated at 2.8 billion years ago show a well-resolved (182)W excess relative to modern terrestrial samples, whereas data for Komati komatiites dated at 3.5 billion years ago show no such excess. Combined (182)W, (186,187)Os, and (142,143)Nd isotopic data indicate that the mantle source of the Kostomuksha komatiites included material from a primordial reservoir that represents either a deep mantle region that underwent metal-silicate equilibration or a product of large-scale magmatic differentiation of the mantle. The preservation, until at least 2.8 billion years ago, of this reservoir-which likely formed within the first 30 million years of solar system history-indicates that the mantle may have never been well mixed.

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Citations

Mar 3, 2012·Science·Vickie C Bennett
Aug 13, 2014·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·H J Melosh
Aug 13, 2014·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·R M Canup
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Apr 26, 2016·Nature·Antonio CaracausiBernard Marty
May 14, 2016·Science·Tais W Dahl
Apr 8, 2017·Science·Andrea MundlRichard J Walker
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Nov 25, 2020·Proceedings of the National Academy of Sciences of the United States of America·Matthew G JacksonRebecca A Fischer
Jan 15, 2021·Proceedings of the National Academy of Sciences of the United States of America·Jonas TuschDieter Garbe-Schönberg
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Mar 14, 2021·Science Advances·Helen M WilliamsOliver Shorttle
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Jul 6, 2021·Geophysical Research Letters·Farhang NabieiPhilippe Gillet
Apr 19, 2020·Physics of Life Reviews·Juan Manuel García-RuizWolfgang Bach

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