Convective activity in a Martian magma chamber recorded by P-zoning in Tissint olivine

Mari, N., Hallis, L. J. , Daly, L. and Lee, M. R. (2020) Convective activity in a Martian magma chamber recorded by P-zoning in Tissint olivine. Meteoritics and Planetary Science, 55(5), pp. 1057-1072. (doi: 10.1111/maps.13488)

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The Tissint Martian meteorite is an unusual depleted olivine‐phyric shergottite, reportedly sourced from a mantle‐derived melt within a deep magma chamber. Here, we report major and trace element data for Tissint olivine and pyroxene, and use these data to provide new insights into the dynamics of the Tissint magma chamber. The presence of irregularly spaced oscillatory phosphorous (P)‐rich bands in olivine, along with geochemical evidence indicative of a closed magmatic system, implies that the olivine grains were subject to solute trapping caused by vigorous crystal convection within the Tissint magma chamber. Calculated equilibration temperatures for the earliest crystallizing (antecrystic) olivine cores suggest a Tissint magma source temperature of 1680 °C, and a local Martian mantle temperature of 1560 °C during the late Amazonian—the latter being consistent with the ambient mantle temperature of Archean Earth.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Lee, Professor Martin and Daly, Dr Luke and Mari, Mr Nicola and Hallis, Dr Lydia
Authors: Mari, N., Hallis, L. J., Daly, L., and Lee, M. R.
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Journal Name:Meteoritics and Planetary Science
ISSN (Online):1945-5100
Published Online:07 May 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Meteoritics and Planetary Science 55(5): 1057-1072
Publisher Policy:Reproduced under a Creative Commons license

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
172314A journey from the solar nebula to planetary bodies: cycling of heat, water and organicsMartin LeeScience and Technology Facilities Council (STFC)ST/N000846/1GES - Earth Sciences
190265Follow the water: insights into the martian hydrosphere from nakhlitesMartin LeeScience and Technology Facilities Council (STFC)ST/H002960/1GES - Earth Sciences