Dark inclusions in the CV3 carbonaceous chondrite Efremovka - Textural and mineralogical observations

Details Dark inclusions in the CV3 carbonaceous chondrite Efremovka - Textural and mineralogical observations Dark inclusions in the CV3 carbonaceous chondrite Efremovka - Textural and mineralogical observations

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..115b&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 115.

Computer Science

Carbonaceous Chondrites, Minerals, Inclusions, Crystal Structure, Asteroids, Metamorphism (Geology), Textures, Scanning Electron Microscopy, Electron Probes, Metallicity, Grain Size, Breccia

Scientific paper

We studied three dark inclusions (DIs) in the reduced CV3 chondrite Efremovka (E81, E82, E90) using optical and SEM and electron probe microanalysis, in addition to E39, E53, and E80 characterized in detail by Krot et al. (1997). These DIs show moderate a degree of alteration similar to those experienced by the Efremovka DI E39. They consist of chondrules and CAIs embedded in fine-grained, opaque matrices, rich in metal. In contrast to E39, sulfides are absent, and Ca-rich rims around Dis are not observed. Low-Ca pyroxene, olivine, and mesostasis in chondrules are completely replaced by an Fe-rich phase consisting mainly of fine-grained fayalitic olivine with minor interstitial, poorly-crystalline Si-Al-rich material and chlorit. We conclude that E81, E82, and E90 also experienced aqueous alteration and subsequent thermal metamorphism in asteroidal environment. Textural observations indicate that E81 and E82 are breccias containing clasts of various degrees of alteration. We infer that brecciation and aggregation of these DIs occurred after aqueous alteration and possibly postdated thermal metamorphism.

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