Shergottite QUE 94201: Texture, Mineral Compositions, and Comparison with Other Basaltic Shergottites

Physics

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Crystallization, Magmatic History, Meteorites: Snc, Shergottites, Shock

Scientific paper

The basaltic shergottites (Shergotty, Zagami and EET A79001) exhibit evidence for complex, multi-stage petrogenesis involving a range of pressures and cooling histories, as well as complex physical processes occurring in near-surface magma bodies. The recently described 12.0 gram shergottite QUE 94201 provides an opportunity to gain further insights into this petrogenesis. The description of QUE 94201 as a coarse-grained mixture of subequal pyroxene (pigeonite, Fs(sub)21-69) and maskelynite suggests similarities to the dark, mottled lithology of Zagami described by McCoy et al, 1995. Our examination of QUE 94201 (PTS 4, 6 and 38) confirms the similarity to the dark, mottled lithology of Zagami. Both are coarse-grained, FeO-rich lithologies with pockets of late-stage phases (e.g., phosphates, Fe,Ti-oxides, fayalite-SiO2 intergrowths; essentially identical to the DN pockets of McCoy et al, 1993). However, QUE 94201 crystallized from a melt more fractionated than Zagami.

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