Chemical, isotopic and mineralogical evidence for the origin of matrix in ordinary chondrites

Details Chemical, isotopic and mineralogical evidence for the origin of matrix in ordinary chondrites Chemical, isotopic and mineralogical evidence for the origin of matrix in ordinary chondrites

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2081b&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, Aug. 1989, p. 2081-2093.

Mathematics

Logic

12

Chondrites, Electron Probes, Grain Size, Meteoritic Composition, Neutron Activation Analysis, Chemical Composition, Isotopes, Mineralogy, Meteorites, Ordinary Chondrites, Chemistry, Isotopes, Mineralogy, Matrix, Origin, Formation, Samples, Meteorite, Alh Meteorites, Alha77299, Oxygen, H3 Chondrites, Laboratory Studies, Composition, Major Elements, Annealing, Condensates, Procedure, Photomicrographs, Microprobe Methods, Morphology, Inaa, Neutron Activation Analysis, Tem, Electron Microscopy, Petrography, Tex

Scientific paper

Results are presented of a combined chemical, isotopic, and mineralogical study of fine-grained opaque matrix material from a type-3 ordinary chondrite Allan Hills A77299. It was found that the matrix of this chondrite (in contrast to chondrules) shows no siderophile element depletions and is remarkably unfractionated relative to CI chondrites. It was also found that the matrix lump has a unique oxygen isotopic composition which lies below the terrestrial fractionation line and differs markedly from the composition of fine-grained matrix lumps and chondrule rims from Semarkona chondrules (Grossman and Wasson, 1987; Grossman et al., 1987); the mineralogy and textures of the matrix lump (which consists of rare angular grains of pyroxene and olivine embedded within a ground-mass of rounded fine-grained olivines), as well as its major element composition, are typical of matrix material of other type-3 chondrites studied. It is concluded that the matrix lump in these chondrites consists largely of material that formed by annealing of amorphous presolar dust or nebular condensates.

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