Asuka 12325

Asuka 12325
Caractéristiques
Type Achondrite
Classe Météorite martienne
Groupe Shergottite
Observation
Localisation Terre de la Reine-Maud (Antarctique)
Chute observée non
Découverte 2012
Masse totale connue 28 g

Asuka 12325 (ou A 12325) est une météorite trouvée en 2012 sur la terre de la Reine-Maud (Antarctique), non loin de la station Asuka (en). Sa composition chimique et minéralogique montre qu'il s'agit d'une météorite martienne, et plus précisément d'une shergottite.

Découverte

A 12325 a été trouvée sur le champ de glace Nansen, au sud des monts Sør Rondane (en), par une équipe nippo-belge pendant leur campagne 2012-2013 de récolte de météorites. Sa masse originelle est de 28,022 g[1].

Pétrologie et minéralogie

A 12325 est essentiellement constituée d'olivine (57 vol %), de pyroxène (28 vol %) et de plagioclase (11 vol %). Les minéraux accessoires sont un phosphate de calcium, la chromite, l'ulvöspinelle, le sulfure de fer FeS et l'ilménite. Sa structure est en partie pœcilitique (en), les cristaux automorphes d'olivine étant plus ou moins complètement enrobés par les cristaux xénomorphes de pyroxène. L'olivine et le pyroxène ont des rapports Mg/Fe variables, et corrélés avec la structure. Les isotopes de l'oxygène se caractérisent par Δ17O = ~0,27 , comme pour les autres météorites martiennes[1].

Notes et références

  1. a et b (en) Atsushi Takenouchi, Akira Yamaguchi, Takashi Mikouchi, Richard Greenwood et Sojiro Yamazaki, « Petrology and shock history of the first depleted-like poikilitic shergottite Asuka 12325 », Meteoritics & Planetary Science, vol. 58, no 10,‎ , p. 1406-1428 (DOI 10.1111/maps.14073 Accès libre).

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