Journal
GEOCHEMICAL JOURNAL
Volume 50, Issue 5, Pages 363-377Publisher
GEOCHEMICAL SOC JAPAN
DOI: 10.2343/geochemj.2.0424
Keywords
NanoSIMS; Martian meteorites; D/H ratio; U-Pb dating; phosphate
Categories
Funding
- UK Science and Technology Facilities Council (STFC) [ST/I001298/1, ST/L000776/1]
- Ministry of Education, Culture, Sports, Science and Technology of Japan [24221002, 2605]
- STFC [ST/I001298/1, ST/L000776/1] Funding Source: UKRI
- Grants-in-Aid for Scientific Research [16J07403, 26106005, 15H05830] Funding Source: KAKEN
Ask authors/readers for more resources
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 delta D value of 4250 +/- 120%, whereas those of merrillite show larger D/H variations with the maximum delta D value of 5260 +/- 790%. However, mafic glass in melt-inclusions shows extremely large variation in delta D, 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available