Apatite halogen and hydrogen isotope constraints on the conditions of hydrothermal alteration in carbonaceous chondrites

Apatite has been widely used for assessing the volatile inventory and hydrothermal fluid compositions of asteroidal and planetary bodies. We report the OH, F, and Cl abundances, as well as the hydrogen isotope composition, of apatite in the CM1‐2 chondrite Boriskino and in the C1‐ungrouped Bench Cra...

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Bibliographic Details
Published in:Meteoritics & planetary science 2021-04, Vol.56 (4), p.809-828
Main Authors: Piralla, Maxime, Tartèse, Romain, Marrocchi, Yves, Joy, Katherine H.
Format: Article
Language:English
Subjects:
Abundance
Apatite
Carbonaceous chondrites
Chondrites
Computational fluid dynamics
Craters
Fluids
Fractionation
Hydrogen
Hydrogen isotopes
Hydroxyapatite
Isotope composition
Isotopes
Lattice strain
Meteorites
Meteors & meteorites
Planetary composition
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Summary:Apatite has been widely used for assessing the volatile inventory and hydrothermal fluid compositions of asteroidal and planetary bodies. We report the OH, F, and Cl abundances, as well as the hydrogen isotope composition, of apatite in the CM1‐2 chondrite Boriskino and in the C1‐ungrouped Bench Crater meteorite. Apatite in both meteorites is halogen‐poor, close to the hydroxylapatite endmember composition, and characterized by average δDSMOW values of −226 ± 59% and 233 ± 92%, respectively. Compared to apatite, the matrix in Bench Crater is depleted in D with a δDSMOW value of −16 ± 119‰. Comparing apatite and water H isotope compositions yields similar apatite‐water D/H fractionation ΔDApatite‐Water of approximately 120–150‰ for both chondrites, suggesting that apatite formed at similar temperatures. Combining a lattice strain partitioning model with apatite F and Cl abundances in Boriskino and Bench Crater yields low F and Cl abundances
ISSN:1086-9379
1945-5100
DOI:10.1111/maps.13639