Mineralogy of augite-bearing ureilites and the origin of their chemical trends

Details Mineralogy of augite-bearing ureilites and the origin of their chemical trends Mineralogy of augite-bearing ureilites and the origin of their chemical trends

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989metic..24...73t&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 24, June 1989, p. 73-81. Research supported by the University of Tokyo.

Computer Science

43

Chondrites, Meteoritic Composition, Mineralogy, Ureilites, Cooling, Crystallization, Electron Microscopy, Pyroxenes, Meteorites, Mineralogy, Ureilites, Augite, Chemistry, Yamato Meteorites, Antarctic Meteorites, Samples, Meteorite, Laboratory Studies, Procedure, Microprobe Methods, Yamato 74130, Met Meteorites, Met 78008, Composition, Alh Meteorites, Alh 82106, Electron Microscopy, Sem, Tem, Classification, Cooling, Photomicrographs, Crystallization, Parent Bodies, Texture

Scientific paper

Results are presented from the electron-microprobe, SEM, and analytical-TEM studies of three augite-bearing ureilites from Antarctica, including sections from the Y74130, MET78008, and ALH82106 meteorites, of which the first two belong to the low-(O-16) subgroup of Clayton and Mayeda (1988) and the third to the high-(O-16) subgroup. It was found that the two low-(O-16) augite-bearing ureilites Y74130 and MET78008 share many features such as bulk composition, macroscopic textures, and spinoidal composition. This subgroup shows large Ca variations in pyroxene with similar Mg/Fe ratios, indicating that differentiation involving reduction was not an important process. In the ALH82106 ureilite, augite is a minor phase and contains lower Na2O contents than Y74130 and MET78008, indicating that the ALH82106 is not directly related to them.

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