Lee, M.R., Tomkinson, T., Mark, D.F., Stuart, F.M., and Smith, C.L. (2013) Evidence for silicate dissolution on Mars from the Nakhla meteorite. Meteoritics and Planetary Science, 48 (2). pp. 224-240. ISSN 1086-9379 Copyright © 2012 The Meteoritical Society http://eprints.gla.ac.uk/74796/ Deposited on: 31 January 2013 Enlighten – Research publications by members of the University of Glasgow http://eprints.gla.ac.uk Evidence for silicate dissolution on Mars from the Nakhla meteorite M.R. Lee1*, T. Tomkinson2, D.F. Mark2, F.M. Stuart2 and C.L. Smith3,4,5 1School of Geographical and Earth Sciences, University of Glasgow, Gregory Building, Lilybank Gardens, Glasgow G12 8QQ, U.K.2 Scottish Universities Environmental Research Centre, Rankine Avenue, Scottish Enterprise Technology Park, East Kilbride, G75 0QF, U.K. 3Department of Mineralogy, Natural History Museum (London), Cromwell Road, London SW7 5BD, U.K. 4European Space Agency ESTEC, Keplerlaan 1, 2200 AG Noordwijk, The Netherlands. 5UK Space Agency, ESA Harwell Centre, Atlas Building, Harwell Oxford, Didcot, Oxfordshire, OX11 0QX, U.K. *Corresponding author. E-mail:
[email protected] Abstract-Veins containing carbonates, hydrous silicates and sulphates that occur within and between grains of augite and olivine in the Nakhla meteorite are good evidence for the former presence of liquid water in the Martian crust. Aqueous solutions gained access to grain interiors via narrow fractures, and those fractures within olivine whose walls were oriented close to (001) were preferentially widened by etching along [001]. This orientation selective dissolution may have been due to the presence within olivine of shock-formed [001](100) and [001]{110} screw dislocations.