Effects of shock and Martian alteration on Tissint hydrogen isotope ratios and water content

Hallis, L.J. , Huss, G.R., Nagashima, K., Taylor, G.J., Stoffler, D. and Lee, M.R. (2017) Effects of shock and Martian alteration on Tissint hydrogen isotope ratios and water content. Geochimica et Cosmochimica Acta, 200, pp. 280-294. (doi: 10.1016/j.gca.2016.12.035)

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The Tissint meteorite, a picritic shergottite, fell to Earth in Morocco on the 18th of July 2011, and is only the fifth Martian meteorite witnessed to fall. Hydrogen isotope ratios and water contents are variable within different minerals in Tissint. Ringwoodite and shock melt pockets contain elevated D/H ratios relative to terrestrial values (δD =761 to 4224 ‰). These high ratios in recrystallized phases indicate significant implantation of hydrogen from the D-rich Martian atmosphere during shock. In contrast, although olivine has detectable water abundances (230-485 ppm), it exhibits much lower D/H ratios (δD = +88 to -150 ‰), suggesting this water was not implanted from the Martian atmosphere. The minimal terrestrial weathering experienced by Tissint gives confidence that the olivine-hosted water has a Martian origin, but its high concentration indicates direct inheritance from the parental melt is improbable, especially given the low pressure of olivine crystallisation. Incorporation of a low δD crustal fluid, or deuteric alteration during crystallisation, could explain the relatively high water contents and low D/H ratios in Tissint olivine.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Lee, Professor Martin and Hallis, Dr Lydia
Authors: Hallis, L.J., Huss, G.R., Nagashima, K., Taylor, G.J., Stoffler, D., and Lee, M.R.
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Journal Name:Geochimica et Cosmochimica Acta
ISSN (Online):1872-9533
Published Online:03 January 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Geochimica et Cosmochimica Acta 200:280-294
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
602461Reconstructing thermal and fluid alteration histories of planetary materials.Martin LeeScience & Technologies Facilities Council (STFC)ST/K000942/1SCHOOL OF GEOGRAPHICAL & EARTH SCIENCES
630461Atmosphere-crust coupling and carbon sequestration on the young MarsMartin LeeUK Space Agency (UK-SPACE)ST/L002167/1SCHOOL OF GEOGRAPHICAL & EARTH SCIENCES