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Water on Mars: Clues from Deuterium/Hydrogen and Water Contents of Hydrous Phases in SNC Meteorites

Watson, Laurie Leshin and Hutcheon, Ian D. and Epstein, Samuel and Stolper, Edward M. (1994) Water on Mars: Clues from Deuterium/Hydrogen and Water Contents of Hydrous Phases in SNC Meteorites. Science, 265 (5168). pp. 86-90. ISSN 0036-8075.

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Ion microprobe studies of hydrous amphibole, biotite, and apatite in shergottite-nakhlite-chassignite (SNC) meteorites, probable igneous rocks from Mars, indicate high deuterium/hydrogen (D/H) ratios relative to terrestrial values. The amphiboles contain roughly one-tentn as much water as expected, suggesting that SNC magmas were less hydrous than previously proposed. The high but variable D/H values of these minerals are best explained by postcrystallization D enrichment of initially D-poor phases by martian crustal fluids with near atmospheric D/H (about five times the terrestrial value). These igneous phases do not directly reflect the D/H ratios of martian "magmatic" water but provide evidence for a D-enriched martian crustal water reservoir.

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Additional Information:© 1994 American Association for the Advancement of Science. Received 14 February 1994; accepted 16 May 1994. We thank A. Kennedy, G. Huss, E. Deloule, and A. Fahey for assistance with the ion microprobe; D. Stevenson for his time and effort on our behalf; G. Wasserburg for use of the ion micro- probe; M. Johnson for sharing notes on kaersu- tite locations; T. McCoy for bringing two of the studied samples to our attention, for photos, and for advice; P. Carpenter for scanning electron microscope and electron microprobe assis- tance; M. Baker, B. McInnes, and J. Beckett for help with standard glass synthesis; and J. Beck- ett and N. Evans for comments on the manu- script. Perceptive reviews from H. McSween Jr. and an anonymous reviewer are greatly appre- ciated. We also thank the following for providing samples for this study: A. Brearley, University of New Mexico (UNM 991); K. Keil, University of Hawaii (UH 106 and UH 234); G. MacPherson, Smithsonian Institution (USNM 624-1 and USNM 321-1); A. Montana, University of California, Los Angeles (terrestrial amphiboles and biotites); and L. Silver, California Institute of Technology (Pacoima Canyon apatite). Supported by Nation- al Aeronautics and Space Administration (NASA) Graduate Student Research Program grant NGT 50800, NASA grants NAG 9-105 and NAGW 3533 (E.M.S.), NAG 9-46 and NAGW 3329 (S.E.), and NAGW 3297 (G. J. Wasser- burg), and contribution 5377 (852), Division of Geological and Planetary Sciences, California Institute of Technology.
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NASA Graduate Student Research ProgramNGT 50800
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Geological and Planetary Sciences5377
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33372
Deposited By: Tony Diaz
Deposited On:28 Aug 2012 21:27
Last Modified:23 Aug 2016 10:16

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