New kind of type 3 chondrite with a graphite-magnetite matrix

Details New kind of type 3 chondrite with a graphite-magnetite matrix New kind of type 3 chondrite with a graphite-magnetite matrix

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..56...19s&link_type=abstract

Earth and Planetary Science Letters, vol. 56, Dec. 1981, p. 19-31.

Computer Science

20

Chondrites, Graphite, Magnetite, Meteoritic Composition, Breccia, Chemical Composition, Chondrule, Electron Probes, Microphotographs, Petrography, Regolith, Meteorites, Ordinary Chondrites, Matrix, Clasts, Samples, Meteorite, Uocs, Description, Laboratory Studies, Graphite, Magnetite, Comparisons, Weston, Dimmitt, Plainview, Procedure, Petrography, Photomicrographs, Composition, Mineralogy, Abundance, Classification

Scientific paper

Four clasts in three ordinary-chondrite regolith breccias are discovered which are a new kind of type 3 chondrite. As with ordinary and carbonaceous type 3 chondrites, they have distinct chondrules, some of which contain glass, highly heterogeneous olivines and pyroxenes, and predominantly monoclinic low-Ca pyroxenes. Instead of the usual, fine-grained, Fe-rich silicate matrix, however, the clasts have a matrix composed largely of aggregates of micron- and submicron-sized graphite and magnetite. The bulk compositions of the clasts, as well as the types of chondrules (largely porphyritic), are characteristic of type 3 ordinary chondrites, although chondrules in the clasts are somewhat smaller (0.1-0.5 mm). A close relationship with ordinary chondrites is also suggested by the presence of similar graphite-magnetite aggregates in seven type 3 ordinary chondrites. It is thought that this new kind of chondrite is probably the source of the abundant graphite-magnetite inclusions in ordinary-chondrite regolith breccias and that it may be more common than indicated by the absence of whole meteorites made of chondrules and graphite-magnetite.

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