Opaque minerals, magnetic properties, and paleomagnetism of the Tissint Martian meteorite

Jérôme Gattacceca, Roger H. Hewins, Jean Pierre Lorand, Pierre Rochette, France Lagroix, Cécile Cournède, Minoru Uehara, Sylvain Pont, Violaine Sautter, Rosa B. Scorzelli, Chrystel Hombourger, Pablo Munayco, Brigitte Zanda, Hasnaa Chennaoui, Ludovic Ferrière

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

We present a description of opaque minerals, opaque mineral compositions, magnetic properties, and paleomagnetic record of the Tissint heavily shocked olivine-phyric shergottite that fell to Earth in 2011. The magnetic mineralogy of Tissint consists of about 0.6 wt% of pyrrhotite and 0.1 wt% of low-Ti titanomagnetite (in the range ulvöspinel 3-15 magnetite 85-97). The titanomagnetite formed on Mars by oxidation-exsolution of ulvöspinel grains during deuteric alteration. Pyrrhotite is unusual, with respect to other shergottites, for its higher Ni content and lower Fe content. Iron deficiency is attributed by an input of regolith-derived sulfur. This pyrrhotite has probably preserved a metastable hexagonal monosulfide solution structure blocked at temperature above 300 °C. The paleomagnetic data indicate that Tissint was magnetized following the major impact suffered by this rock while cooling at the surface of Mars from a post-impact equilibrium temperature of approximately 310 °C in a stable magnetic field of about 2 μT of crustal origin. Tissint is too weakly magnetic to account for the observed magnetic anomalies at the Martian surface.

Original languageEnglish (US)
Pages (from-to)1919-1936
Number of pages18
JournalMeteoritics and Planetary Science
Volume48
Issue number10
DOIs
StatePublished - Oct 2013

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