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)

Abstract

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
• Status: Published
• Refereed: Yes
• 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
• Publisher: Wiley
• ISSN: 1086-9379
• 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

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
172314		A journey from the solar nebula to planetary bodies: cycling of heat, water and organics	Martin Lee	Science and Technology Facilities Council (STFC)	ST/N000846/1	GES - Earth Sciences
190265		Follow the water: insights into the martian hydrosphere from nakhlites	Martin Lee	Science and Technology Facilities Council (STFC)	ST/H002960/1	GES - Earth Sciences