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Combined investigation of H isotopic compositions and U-Pb chronology of young Martian meteorite Larkman Nunatak 06319

Koike, Mizuho; Sano, Yuji; Takahata, Naoto; Ishida, Akizumi; Sugiura, Naoji and Anand, Mahesh (2016). Combined investigation of H isotopic compositions and U-Pb chronology of young Martian meteorite Larkman Nunatak 06319. Geochemical Journal, 50(5) pp. 363–377.

DOI (Digital Object Identifier) Link: https://doi.org/10.2343/geochemj.2.0424
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Abstract

We measured the hydrogen isotopic composition (D/H ratios) and U-Pb chronology of phosphate minerals in a young Martian meteorite: LAR 06319. D/H ratios of melt-inclusions in the meteorite were also investigated to evaluate the presence of water reservoirs on Mars in recent times. The total Pb/U dating of multiple grains of apatite and merrillite yield a concordant date of 167 ± 57 Ma, interpreted as the crystallization age, suggesting that both apatite and merrillite in this meteorite have preserved their igneous histories. The D/H ratios of an apatite grain show good reproducibility yielding a δD value of 4250 ± 120 ‰, whereas those of merrillite show larger D/H variations with the maximum δD value of 5260 ± 790 ‰. However, mafic glass in melt-inclusions shows extremely large variation in δD, ranging from ca. 1070 ‰ to 6830 ± 460 ‰. The different D/H signatures recorded in these phases reflect the contributions of different hydrous components with distinct D/H ratios, possibly incorporated at different times. It is inferred that several isotopically distinct water reservoirs exist in the present Martian surface/sub-surface system.

Item Type: Journal Item
Copyright Holders: 2016 The Geochemical Society of Japan
ISSN: 1880-5973
Project Funding Details:
Funded Project NameProject IDFunding Body
Astronomy and Planetary Sciences at the Open UniversityST/L000776/1STFC (Science & Technology Facilities Council)
Secular evolution of water in the lunar mantle (SE-10-037-MA)ST/I001298/1STFC (Science & Technology Facilities Council)
Keywords: NanoSIMS; Martian meteorites; D/H ratio; U-Pb dating; phosphate
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 46678
Depositing User: Mahesh Anand
Date Deposited: 16 Jun 2016 09:55
Last Modified: 07 Dec 2018 10:42
URI: http://oro.open.ac.uk/id/eprint/46678
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