Cristobalite-pyroxene in an L6 chondrite - Implications for metamorphism

Details Cristobalite-pyroxene in an L6 chondrite - Implications for metamorphism Cristobalite-pyroxene in an L6 chondrite - Implications for metamorphism

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..56...82o&link_type=abstract

Earth and Planetary Science Letters, vol. 56, Dec. 1981, p. 82-88. Research supported by the Field Museum of Natural History

Computer Science

19

Chondrites, Metamorphism (Geology), Meteoritic Composition, Pyroxenes, Silicon Dioxide, Chemical Composition, Electron Microscopy, Inclusions, Olivine, Oxygen Isotopes, X Ray Diffraction, Meteorites, L6 Chondrites, Metamorphism, Samples, Meteorite, Pyroxene, Cristobalite, Laboratory Studies, Alha 76003, Antarctic Meteorites, Origin, Formation, Allen Hills Meteorites, Procedure, Oxygen, Isotopes, Transport, Major Elements

Scientific paper

CRISPY is a cristobalite-pyroxene assemblage in the L6 chondrite ALHA 76003. It was formed by reaction of a very siliceous inclusion with the surrounding olivine-rich rock. Oxygen isotopes show that the inclusion was derived from a source with non-chondritic isotopic composition. The isotopes also show that the oxygen of the pyroxene reaction product was derived by simple mixing of oxygen from the inclusion and its immediately adjacent surroundings, with exchange with the bulk meteorite limited to a distance of about a millimeter. The persistence of cristobalite in close proximity to olivine, and the lack of isotopic equilibration, show that the metamorphic processes that form petrographic grade 6 chondrites involve transport of major elements over distances only on the order of millimeters.

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