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. https://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.
Item Type: | Article | ||||||
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Additional Information: | © 2016 Wiley. First published: 20 July 2016. | ||||||
Issue or Number: | S1 | ||||||
Record Number: | CaltechAUTHORS:20161220-075954459 | ||||||
Persistent URL: | https://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: | 09 Mar 2020 13:19 |
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