Igneous history of the aubrite parent asteroid - Evidence from the Norton County enstatite achondrite

Details Igneous history of the aubrite parent asteroid - Evidence from the Norton County enstatite achondrite Igneous history of the aubrite parent asteroid - Evidence from the Norton County enstatite achondrite

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988metic..23...59o&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 23, March 1988, p. 59-74.

Mathematics

Logic

43

Enstatite, Igneous Rocks, Meteoritic Composition, Rare Gases, Crystallization, Neutron Activation Analysis, Optical Microscopes, Asteroids, Aubrites, Parent Bodies, Meteorites, Laboratory Studies, Norton County, Achondrites, Enstatites, Samples, Meteorite, Description, Optical Microscopy, Microprobe Methods, Neutron Activation Analysis, Inaa, Igneous Rocks, Origin, Source, Formation, Composition, Lithology, Matrix, Mineralogy, Procedure, Clasts, Brecciation, Plutonic Rocks, Texture, Crystallization, Photogr

Scientific paper

Numerous specimens of the Norton County enstatite achondrite (aubrite) were studied by optical microscopy, electron microprobe, and neutron-activation analysis. Norton County is found to be a fragmental impact breccia, consisting of a clastic matrix made mostly of crushed enstatite, into which are embedded a variety of mineral and lithic clasts of both igneous and impact melt origin. The Norton County precursor materials were igneous rocks, mostly plutonic orthopyroxenites, not grains formed by condensation from the solar nebula. The Mg-silicate-rich aubrite parent body experienced extensive melting and igneous differentiation, causing formation of diverse lithologies including dunites, plutonic orthopyroxenites, plutonic pyroxenites, and plagioclase-silica rocks. The presence of impact melt breccias (the microporphyritic clasts and the diopside-plagioclase-silica clast) of still different compositions further attests to the lithologic diversity of the aubrite parent body.

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