Petrographic and geochemical evidence for multiphase formation of carbonates in the Martian orthopyroxenite Allan Hills 84001

Carles E. Moyano-Cambero*, Josep M. Trigo-Rodríguez, M. Isabel Benito, Jacinto Alonso-Azcárate, Martin R. Lee, Narcís. Mestres, Marina Martínez-Jiménez, Francisco J. Martín-Torres, Jordi Fraxedas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Martian meteorites can provide valuable information about past environmental conditions on Mars. Allan Hills 84001 formed more than 4 Gyr ago, and owing to its age and long exposure to the Martian environment, and this meteorite has features that may record early processes. These features include a highly fractured texture, gases trapped during one or more impact events or during formation of the rock, and spherical Fe-Mg-Ca carbonates. In this study, we have concentrated on providing new insights into the context of these carbonates using a range of techniques to explore whether they record multiple precipitation and shock events. The petrographic features and compositional properties of these carbonates indicate that at least two pulses of Mg- and Fe-rich solutions saturated the rock. Those two generations of carbonates can be distinguished by a very sharp change in compositions, from being rich in Mg and poor in Fe and Mn, to being poor in Mg and rich in Fe and Mn. Between these two generations of carbonate is evidence for fracturing and local corrosion.

Original languageEnglish
Pages (from-to)1030-1047
Number of pages18
JournalMeteoritics and Planetary Science
Volume52
Issue number6
Early online date10 Mar 2017
DOIs
Publication statusPublished - Jun 2017

Keywords

  • Astrophysics - Earth and Planetary Astrophysics
  • Petrographic
  • geochemical evidence
  • Mars

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