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<title lang=en>A mineralogical and geochemical study of polymict eucrite discovered in Sahara of southwest Algeria</title>
<creator>Seddiki, Abdelmadjid</creator>
<creator>Moine, Bertrand</creator>
<creator>Cottin, Jean-Yves</creator>
<creator>Bascou, Jerôme</creator>
<creator>Godard, Marguerite</creator>
<creator>Faure, François</creator>
<creator>Bourot-Denise, Michele</creator>
<creator>Remaci, Nacera</creator>
<contributor>Laboratoire de Géoressources et Risques Naturels, Université d'Oran</contributor>
<contributor>Manteau et Interfaces ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Centre de Recherches Pétrographiques et Géochimiques (CRPG) ; Université de Lorraine (UL) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire de minéralogie du Muséum National d'Histoire Naturelle (LMMNHN) ; Muséum National d'Histoire Naturelle (MNHN) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 1866-7411</source>
<source>Arabian Journal of Geosciences</source>
<publisher>Springer</publisher>
<identifier>hal-00903591</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00903591</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00903591</source>
<source>Arabian Journal of Geosciences, Springer, 2013, 6 (9), pp.3175-3184. 〈10.1007/s12517-012-0624-4〉</source>
<identifier>DOI : 10.1007/s12517-012-0624-4</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/s12517-012-0624-4</relation>
<language>en</language>
<subject lang=ro>4-Vesta</subject>
<subject lang=ro>NWA2268</subject>
<subject lang=ro>Polymict eucrite</subject>
<subject lang=ro>Basaltic achondrite</subject>
<subject lang=ro>Meteorite</subject>
<subject lang=ro>Algeria</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>NWA2268 is a polymict eucrite discovered in the Sahara, at southwest Algeria, close to the region of Tindouf. This meteorite weighs 65 g and presents a thin black fusion crust. The rock is fine- to medium-grained breccia and contains mineral fragments of plagioclases, pyroxenes, spinel, olivine and silica. The rock contains some basaltic fragments with sub-ophitic or cumulative textures, constituted by plagioclases and exsolved pigeonite. Pyroxferroite grains are present and locally destabilised in an association of hedenbergite, fayalite and silica. It also presents unequilibrated eucritic clast with heterogeneous pyroxenes and plagioclases compositions. Pyroxenes in the all of the other clasts have equilibrated composition, with exolved pigeonites with augite lamellaes. This polymict eucrite contains also partially devitrified glass that represents impact melts linked to impact event. None recrystallization of this glass confirms a lack of post-brecciation metamorphism. Diogenitic fragments are less abundant than 10 %. The oxygen isotopic composition of NWA2268 is Δ17O (−0.43). This meteorite is interpreted as belonging to the HED group attributed to the 4-Vesta asteroid.</description>
<date>2013-09</date>
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