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Petrological, petrofabric, and oxygen isotopic study of five ungrouped meteorites related to brachinites

Hasegawa, Hikari; Mikouchi, Takashi; Yamaguchi, Akira; Yasutake, Masahiro; Greenwood, Richard and Franchi, Ian A. (2019). Petrological, petrofabric, and oxygen isotopic study of five ungrouped meteorites related to brachinites. Meteoritics & Planetary Science, 54(4) pp. 752–767.

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Northwest Africa (NWA) 6112, Miller Range (MIL) 090206 (plus its pairs: MIL 090340 and MIL 090405), and Divnoe are olivine-rich ungrouped achondrites. We investigated and compared their petrography, mineralogy, and olivine fabrics. We additionally measured the oxygen isotopic compositions of NWA 6112. They show similar petrography, mineralogy, and oxygen isotopic compositions and we concluded that these five meteorites are brachinite clan meteorites. We found that NWA 6112 and Divnoe had a c axis concentration pattern of olivine fabrics using electron backscattered diffraction (EBSD). NWA 6112 and Divnoe are suggested to have been exposed to magmatic meltflows during their crystallization on their parent body. On the other hand, the three MIL meteorites have b axis concentration patterns of olivine fabrics. This indicates that the three MIL meteorites may be cumulates where compaction of olivine grains was dominant. Alternatively, they formed as residues and were exposed to olivine compaction. The presence of two different olivine fabric patterns implies that the parent body(s) of brachinite clan meteorites experienced diverse igneous processes.

Item Type: Journal Item
Copyright Holders: 2019 The Meteoritical Society
ISSN: 1945-5100
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 59250
SWORD Depositor: Jisc Publications-Router
Depositing User: Jisc Publications-Router
Date Deposited: 25 Feb 2019 11:07
Last Modified: 01 Jul 2020 07:08
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