Startseite Discovery of asimowite, the Fe-analog of wadsleyite, in shock-melted silicate droplets of the Suizhou L6 and the Quebrada Chimborazo 001 CB3.0 chondrites
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Discovery of asimowite, the Fe-analog of wadsleyite, in shock-melted silicate droplets of the Suizhou L6 and the Quebrada Chimborazo 001 CB3.0 chondrites

  • Luca Bindi EMAIL logo , Frank E. Brenker , Fabrizio Nestola , Tamara E. Koch , David J. Prior , Kat Lilly , Alexander N. Krot , Martin Bizzarro und Xiande Xie
Veröffentlicht/Copyright: 26. April 2019
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Abstract

We report the first natural occurrence and single-crystal X‑ray diffraction study of the Fe-analog of wadsleyite [a = 5.7485(4), b = 11.5761(9), c = 8.3630(7) Å, V = 556.52(7) Å3; space group Imma], spinelloid-structured Fe2SiO4, a missing phase among the predicted high-pressure polymorphs of ferroan olivine, with the composition(Fe1.102+Mg0.80Cr0.043+Mn0.022+Ca0.02Αl0.02Na0.01)Σ2.01(Si0.97Αl0.03)Σ1.00O4. The new mineral was approved by the International Mineralogical Association (No. 2018-102) and named asimowite in honor of Paul D. Asimow, the Eleanor and John R. McMillan Professor of Geology and Geochemistry at the California Institute of Technology. It was discovered in rare shock-melted silicate droplets embedded in Fe,Ni-metal in both the Suizhou L6 chondrite and the Quebrada Chimborazo (QC) 001 CB3.0 chondrite. Asimowite is rare, but the shock-melted silicate droplets are very frequent in both meteorites, and most of them contain Fe-rich wadsleyite (Fa30–45). Although the existence of such Fe-rich wadsleyite in shock veins may be due to the kinetic reasons, new theoretical and experimental studies of the stability of (Fe,Mg)2SiO4 at high temperature (>1800 K) and pressure are clearly needed. This may also have a significant impact on the temperature and chemical estimates of the mantle’s transition zone in Earth.

Acknowledgments

The manuscript took advantage from the revision of Ross Angel, Chi Ma, Naotaka Tomioka, Ian Swainson, and one anonymous reviewer. The research was supported by “progetto di Ateneo 2016, University of Firenze” to L.B.

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Received: 2019-01-15
Accepted: 2019-02-13
Published Online: 2019-04-26
Published in Print: 2019-05-27

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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