Magombedze - A new H-chondrite with light-dark structure

Details Magombedze - A new H-chondrite with light-dark structure Magombedze - A new H-chondrite with light-dark structure

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993metic..28..138m&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 28, no. 1, p. 138-142.

Computer Science

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Breccia, Chondrites, Chondrule, Meteoritic Microstructures, Petrography, Chemical Analysis, Glass, Olivine, Scanning Electron Microscopy, Silicates, Meteorites, Stony Meteorites, Chondrites, H Chondrites, Magombedze, Structure, Description, Samples, Meteorite, Composition, Silicates, Clasts, Chondrules, Procedure, Laboratory Studies, Electron Microscopy, Sem, Chemistry, Mineralogy, Data, Olivine, Pyroxene, Plagioclase, Comparison, Breccia, Shock Effects, Petrology, Lithology, Formation, Origin

Scientific paper

Magombedze is a light-dark structured H-chondrite breccia that fell in Zimbabwe on July 2, 1990 at 15:30 GMT. White clasts are moderately shocked and have equilibrated mafic silicates (pyroxene Fs(16-18), olivine Fa(18-19)) together with clear optically-recognizable plagioclase of variable composition (An(9-13) found); chondrules are distinct but contain no trace of preserved glass. The darker surrounding material contains a higher proportion of fine-grained metal and sulfide than the white clasts, and many of its constituent grains show little evidence of shock. Mafic silicates in the dark lithology are distinctly less-equilibrated (pyroxene Fs(5-21), olivine Fa(11-20)) than those in the white clasts, and many chondrules preserve brown devitrified glass; some metamorphic plagioclase of variable composition (An(11-22) found) is present. Some monoclinic pyroxene occurs in both fractions, but it is relatively common in the dark fraction. The white clasts are classified as H5, and the enclosing dark material is H3-5.

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