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A heterogeneous lunar interior for hydrogen isotopes as revealed by the lunar highlands samples

Hui, Hejiu and Guan, Yunbin and Chen, Yang and Peslier, Anne H. and Zhang, Youxue and Liu, Yang and Flemming, Roberta L. and Rossman, George R. and Eiler, John M. and Neal, Clive R. and Osinski, Gordon R. (2017) A heterogeneous lunar interior for hydrogen isotopes as revealed by the lunar highlands samples. Earth and Planetary Science Letters, 473 . pp. 14-23. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20170613-095839194

[img] PDF (Supplementary information consists in details about effects from sample preparation on hydrogen, hydrogen isotope fractionation between mineral and melt, δD value of GRR1968, and estimation of the initial LMO water content) - Supplemental Material
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[img] MS Excel (Table S1 - δD and ages of lunar plutonic rocks and basalts) - Supplemental Material
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[img] MS Excel (Table S2 - Rb–Sr isotope compositions of 77215, 78236, 78238, and 60015) - Supplemental Material
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[img] MS Excel (Table S3 - Major and trace elements of 77215, 78235, and 60015) - Supplemental Material
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[img] MS Excel (Table S4 - Water contents and δD of fresh samples from Izu–Bonin–Mariana arc system) - Supplemental Material
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Abstract

Knowing the amount and timing of water incorporation into the Moon has fundamental implications for our understanding of how the Earth–Moon system formed. Water has been detected in lunar samples but its abundance, distribution and origin are debated. To address these issues, we report water concentrations and hydrogen isotope ratios obtained by secondary ion mass spectrometry (SIMS) of plagioclase from ferroan anorthosites (FANs), the only available lithology thought to have crystallized directly from the lunar magma ocean (LMO). The measured water contents are consistent with previous results by Fourier transform infrared spectroscopy (FTIR). Combined with literature data, δD values of lunar igneous materials least-degassed at the time of their crystallization range from −280 to +310‰, the latter value being that of FAN 60015 corrected for cosmic ray exposure. We interpret these results as hydrogen isotopes being fractionated during degassing of molecular hydrogen (H_2) in the LMO, starting with the magmatic δD value of primordial water at the beginning of LMO being about −280‰, evolving to about +310‰ at the time of anorthite crystallization, i.e. during the formation of the primary lunar crust. The degassing of hydrogen in the LMO is consistent with those of other volatile elements. The wide range of δD values observed in lunar igneous rocks could be due to either various degrees of mixing of the different mantle end members, or from a range of mantle sources that were degassed to different degrees during magma evolution. Degassing of the LMO is a viable mechanism that resulted in a heterogeneous lunar interior for hydrogen isotopes.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.epsl.2017.05.029DOIArticle
http://www.sciencedirect.com/science/article/pii/S0012821X17302959PublisherArticle
ORCID:
AuthorORCID
Rossman, George R.0000-0002-4571-6884
Additional Information:© 2017 Elsevier B.V. Received 30 December 2016, Revised 16 May 2017, Accepted 19 May 2017, Available online 9 June 2017. We thank the Apollo sample curators for allocating us the samples. This research was supported by NASA grants NNX11AH48G (HH, AHP and YZ), NNX15AH37G (YZ), and NNX15AH76G (CRN). We thank the editor Fred Moynier, reviewer Justin Simon and an anonymous reviewer for their constructive and detailed comments, which helped improve this paper.
Funders:
Funding AgencyGrant Number
NASANNX11AH48G
NASANNX15AH37G
NASANNX15AH76G
Subject Keywords:Moon; lunar magma ocean; water; hydrogen isotope; ferroan anorthosite; plagioclase
Record Number:CaltechAUTHORS:20170613-095839194
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170613-095839194
Official Citation:Hejiu Hui, Yunbin Guan, Yang Chen, Anne H. Peslier, Youxue Zhang, Yang Liu, Roberta L. Flemming, George R. Rossman, John M. Eiler, Clive R. Neal, Gordon R. Osinski, A heterogeneous lunar interior for hydrogen isotopes as revealed by the lunar highlands samples, Earth and Planetary Science Letters, Volume 473, 1 September 2017, Pages 14-23, ISSN 0012-821X, https://doi.org/10.1016/j.epsl.2017.05.029. (http://www.sciencedirect.com/science/article/pii/S0012821X17302959)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78156
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Jun 2017 15:00
Last Modified:20 Jun 2017 15:00

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