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Title: The production rate of cosmogenic deuterium at the Moon's surface

Journal Article · · Earth and Planetary Science Letters
ORCiD logo [1];  [1]; ORCiD logo [2]
  1. Petrographic and Geochemical Research Center, Vandoeuvre les Nancy Cedex (France)
  2. Univ. of Chicago, IL (United States). Dept. of Geophysical Sciences, Chicago Center for Cosmochemistry

The hydrogen (D/H) isotope ratio is a key tracer for the source of planetary water. However, secondary processes such as solar wind implantation and cosmic ray induced spallation reactions have modified the primordial D/H signature of ‘water’ in all rocks and soils recovered on the Moon. We re-evaluate the production rate of cosmogenic deuterium (D) at the Moon's surface through ion microprobe analyses of hydrogen isotopes in olivines from eight Apollo 12 and 15 mare basalts. Furthermore, these in situ measurements are complemented by CO2 laser extraction-static mass spectrometry analyses of cosmogenic noble gas nuclides (3He, 21Ne, 38Ar). Cosmic ray exposure (CRE) ages of the mare basalts, derived from their cosmogenic 21Ne content, range from 60 to 422 Ma. These CRE ages are 35% higher, on average, than the published values for the same samples. The amount of D detected in the olivines increases linearly with increasing CRE ages, consistent with a production rate of (2.17±0.11)×10-12 mol(g rock)-1 Ma-1. This value is more than twice as high as previous estimates for the production of D by galactic cosmic rays, indicating that for water-poor lunar samples, i.e., samples with water concentrations ≤50 ppm, corrected D/H ratios have been severely overestimated.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE; National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
AC52-07NA27344; NNX09AG39G
OSTI ID:
1414349
Report Number(s):
LLNL-JRNL-731359
Journal Information:
Earth and Planetary Science Letters, Vol. 474, Issue C; ISSN 0012-821X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (3)

Origin and significance of cosmogenic signatures in vesicles of lunar basalt 15016 journal March 2018
Experimental constraints on the solidification of a hydrous lunar magma ocean journal December 2019
New clues to ancient water on Itokawa journal May 2019

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