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Discovery of tetragonal almandine, (Fe,Mg,Ca,Na)_3(Al,Si,Mg)_2Si_3O_(12), a new high-pressure mineral in Shergotty

Ma, Chi and Tschauner, Oliver (2016) Discovery of tetragonal almandine, (Fe,Mg,Ca,Na)_3(Al,Si,Mg)_2Si_3O_(12), a new high-pressure mineral in Shergotty. Meteoritics and Planetary Science, 51 (S1). Art. No. 6124. ISSN 1086-9379. http://resolver.caltech.edu/CaltechAUTHORS:20161220-075954459

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Abstract

Introduction: During a nanomineralogy investigation of the Shergotty meteorite, we have identified a new shock-induced high-pressure silicate, majoritic almandine with a tetragonal I4_1/ɑ structure, in an impact melt pocket. Field-emission scanning electron microscope, electron back-scatter diffraction, electron microprobe and synchrotron diffraction were used to characterize its chemical composition, structure, and associated phases. Tetragonal majorite (Mg_3(SiMg)Si_3O_(12)) with the I4_1/ɑ structure was synthesized [e.g., 1] and found later in the Tenham chondrite [2,3]. Tetragonal almandine-pyrope phase (TAPP) with the I-42d structure was reported to occur as inclusions in lowermantle diamonds [4]. We present here the first occurrence of tetragonal almandine with the I41/a structure in a shocked meteorite from Mars as a new high-pressure phase.


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http://onlinelibrary.wiley.com/doi/10.1111/maps.12705/epdfPublisherArticle
Additional Information:© 2016 Wiley. First published: 20 July 2016.
Record Number:CaltechAUTHORS:20161220-075954459
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20161220-075954459
Official Citation:Ma C, Tschauner O (2016) Discovery of tetragonal almandine, (Fe,Mg,Ca,Na)3(Al,Si,Mg)2Si3O12, a new high-pressure mineral in Shergotty. Meteoritics and Planetary Science, 51 (S1), Abstract No. 6124
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72960
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:20 Dec 2016 16:58
Last Modified:20 Dec 2016 16:58

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