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Water, fluorine, and sulfur concentrations in the lunar mantle

Chen, Yang and Zhang, Youxue and Liu, Yang and Guan, Yunbin and Eiler, John and Stolper, Edward M. (2015) Water, fluorine, and sulfur concentrations in the lunar mantle. Earth and Planetary Science Letters, 427 . pp. 37-46. ISSN 0012-821X. https://resolver.caltech.edu/CaltechAUTHORS:20150904-065222469

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Abstract

The concentrations of volatile elements in the moon have important implications for the formation of the earth–moon system. There is currently a debate regarding the water content of the lunar mantle: Authors studying H_2O in lunar pyroclastic glass beads and in olivine-hosted melt inclusions in such pyroclastic samples and in plagioclase crystals in lunar highland anorthosites infer hundreds of ppm H_2O in the lunar mantle. In contrast, authors studying Zn/Fe ratios infer that the H_2O concentration in the lunar mantle is ≤1 ppm, and they argue that the glassy lunar basalts are a local anomaly. We contribute to a resolution of the debate by a broader examination of the concentrations of H_2O and other volatile components in olivine-hosted melt inclusions in a wider range of lunar mare basalts, including crystalline melt inclusions that are homogenized by melting in the laboratory. We find that F, Cl, and S concentrations in various lunar melt inclusions (including those in glassy lunar basalts) are similar to one another, and previously studied glassy lunar basalts are not a local anomaly in terms of these volatile concentrations. Furthermore, we estimate the pre-degassing H_2O/Ce, F/Nd, and S/Dy ratios of mare basaltic magmas to be at least 64, 4.0 and 100 respectively. These ratios are lower than those of primitive earth mantle by a factor of 3, 5, and 4 respectively. The depletion factors of these volatile elements relative to the earth's primitive mantle do not correlate strongly with volatility or bonding energy, and indeed they are roughly constant and similar to those of other volatile elements such as Li, Cs, Rb and K. This approximate constancy of volatile depletion in the moon relative to the earth can be explained by assuming that both the earth and the moon acquired volatiles from a similar source or by a similar mechanism but the earth was more efficient in acquiring the volatiles. We estimate the H_2O, F and S concentrations in the primitive lunar mantle source to be at least 110, 5.3, and 70 ppm, respectively – similar to or slightly lower than those in terrestrial MORB mantle.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.epsl.2015.06.046DOIArticle
http://www.sciencedirect.com/science/article/pii/S0012821X15004094PublisherArticle
ORCID:
AuthorORCID
Zhang, Youxue0000-0002-7439-0086
Guan, Yunbin0000-0002-7636-3735
Stolper, Edward M.0000-0001-8008-8804
Additional Information:© 2015 Elsevier B.V. Received 13 January 2015, Revised 22 June 2015, Accepted 23 June 2015, Available online 15 July 2015. We thank NASA CAPTEM for providing the lunar samples, K.P. Jochum for providing the MPI-Ding glass standards, F. Albarede, Cin-Ty Lee, and three anonymous reviewers for comments. This research is supported by NASA grants NNX10AH74G and NNX15AH37G, and University of Michigan funds. YL acknowledges NASA grant NNN13D465T and support from Jet Propulsion Laboratory, which is managed by California Institute of Technology under a contract with NASA. EMS acknowledges NASA grant NNX12AH63G.
Funders:
Funding AgencyGrant Number
NASANNX10AH74G
NASANNX15AH37G
University of MichiganUNSPECIFIED
NASANNN13D465T
NASANNX12AH63G
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:moon; melt inclusions; volatiles; water; H2O/Ce ratio; F/Nd ratio
Record Number:CaltechAUTHORS:20150904-065222469
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150904-065222469
Official Citation:Yang Chen, Youxue Zhang, Yang Liu, Yunbin Guan, John Eiler, Edward M. Stolper, Water, fluorine, and sulfur concentrations in the lunar mantle, Earth and Planetary Science Letters, Volume 427, 1 October 2015, Pages 37-46, ISSN 0012-821X, http://dx.doi.org/10.1016/j.epsl.2015.06.046. (http://www.sciencedirect.com/science/article/pii/S0012821X15004094)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60065
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:04 Sep 2015 19:37
Last Modified:27 Nov 2019 00:22

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