Petrologic and Isotopic Characterization of Olivine-phyric Depleted Shergotitte Northwest Africa 6162

Content Provider	Semantic Scholar
Author	Suarez, S. E. Righter, M. Udry, A. Lapen, T. J. Irving, A. J.
Copyright Year	2020
Abstract	Introduction: Shergottites, the most abundant class of martian meteorites, are mafic to ultramafic igneous rocks that have a wide range of crystallization ages that span over 2 billion years [1]. Their mineralogy, textures, trace element and radiogenic isotope compositions can provide information about early planetary differentiation, evolution of mantle reservoirs, and magmatic processes that occur in the curst and upper mantle. Shergottites are classified petrographically by their textures and geochemically by rare earth element and radiogenic isotopic compositions. Igneous textural types are distinguished as basaltic, olivine-phyric, gabbroic, and poikilitic while geochemical groups are distinguished as enriched, intermediate, or depleted with respect to incompatible to compatible trace element ratios. Olivine-phyric shergottites are characterized by olivine phenocrysts set in a finergrained groundmass composed of pyroxene, maskelynite, olivine, and minor phases including chromite, ulvöspinel, and ilmenite [2]. Based on the texture and trace element abundances, Northwest Africa (NWA) 6162 is characterized as an olivinephyric depleted shergottite [3] that was found in 2010 near Lbirat, Morocco. NWA 6162 is the focus of this study because the specimen experienced little terrestrial alteration [3] and is launch-paired with other depleted shergottites [1].
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Language	English
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Resource Type	Article