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Petrology, geochemistry, and cosmic-ray exposure age of lherzolitic shergottite Northwest Africa 1950 5
Gillet, P; Barrat, J; Beck, P; Marty, B; Greenwood, R; Franchi, I; Bohn, Marcel; Cotten, J.
Northwest Africa (NWA) 1950 is a new member of the lherzolitic shergottite clan of the Martian meteorites recently found in the Atlas Mountains. The petrological, mineralogical, and geochemical data are very close to those of the other known lherzolitic shergottites. The meteorite has a cumulate gabbroic texture and its mineralogy consists of olivine (FO66 to FO75), low and high-Ca pyroxenes (En(78)Fs(19)Wo(2)-En(60)FS(26)W(14); En(53)Fs(16)Wo(31)-En(45)Fs(14)Wo(41)), and plagioclase (An(57)Ab(41)Or(1) to An(40)Ab(57)Or(3); entirely converted into maskelynite during intense shock metamorphism). Accessory minerals include phosphates (merrillite), chromite and spinels, sulfides, and a glass rich in potassium. The oxygen isotopic values lie on the fractional...
Tipo: Text Palavras-chave: Meteorites; Atlas Mountains; Shergottite; Lherzolitic.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-900.pdf
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The collection of Meteorites in the Vernadsky State Geological Museum of the Russian Academy of Science (19th-20th centuries - the history of its origin and study) 16
Bessudnova, Z.A..
Tipo: Article / Letter to the editor Palavras-chave: Meteorites; Collection; Catalogue; Museum; Russia; 39.54.
Ano: 2004 URL: http://www.repository.naturalis.nl/record/215352
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Volatile element evolution of chondrules through time 5
Mahan, Brandon; Moynier, Frederic; Siebert, Julien; Gueguen, Bleuenn; Agranier, Arnaud; Pringle, Emily A.; Bollard, Jean; Connelly, James N.; Bizzarro, Martin.
Chondrites and their main components, chondrules, are our guides into the evolution of the Solar System. Investigating the history of chondrules, including their volatile element history and the prevailing conditions of their formation, has implications not only for the understanding of chondrule formation and evolution but for that of larger bodies such as the terrestrial planets. Here we have determined the bulk chemical composition-rare earth, refractory, main group, and volatile element contents-of a suite of chondrules previously dated using the Pb-Pb system. The volatile element contents of chondrules increase with time from similar to 1 My after Solar System formation, likely the result of mixing with a volatile-enriched component during chondrule...
Tipo: Text Palavras-chave: Cosmochemistry; Planetary formation; Pebble accretion; Solar System evolution; Meteorites.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00638/74979/75756.pdf
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