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Occurrence of tuite and ahrensite in Zagami and their significance for shock-histories recorded in martian meteorites

Gu Lixin, Hu Sen, Mahesh Anand, Tang Xu, Ji Jianglong, Zhang Bin, Wang Nian and Lin Yangting
Occurrence of tuite and ahrensite in Zagami and their significance for shock-histories recorded in martian meteorites
American Mineralogist (June 2022) 107 (6): 1018-1029

Abstract

We report on the discovery of two high-pressure minerals, tuite and ahrensite, located in two small shock-induced melt pockets (SIMP 1 and 2) in the Zagami martian meteorite, coexisting with granular and acicular stishovite and seifertite. Tuite identified in this study has two formation pathways: decomposition of apatite and transformation of merrillite under high-P-T conditions. Chlorine-bearing products, presumably derived from the decomposition of apatite, are concentrated along the grain boundaries of tuite grains. Nanocrystalline ahrensite in the pyroxene clast in SIMP 2 is likely to be a decomposition product of pigeonite under high-P-T conditions by a solid-state transformation mechanism. The pressure and temperature conditions estimated from the high-pressure minerals in the shock-induced melt pockets are approximately 12-22 GPa and approximately 1100-1500 degrees C, respectively, although previous estimates of peak shock pressure are higher. This discrepancy probably represents the shift of kinetic relative to thermodynamic phase boundaries, in particular the comparatively small region that we examine here, rather than a principal disagreement between the peak shock conditions.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 107
Serial Issue: 6
Title: Occurrence of tuite and ahrensite in Zagami and their significance for shock-histories recorded in martian meteorites
Affiliation: Chinese Academy of Sciences, Institute of Geology and Geophysics, Beijing, China
Pages: 1018-1029
Published: 202206
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 80
Accession Number: 2022-033426
Categories: Petrology of meteorites and tektites
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: Open University, GBR, United KingdomChongqing University, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202212
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