Cooling history of pyroxene chondrules in the Yamato-74191 chondrite (L3) - an electron microscopic study

Details Cooling history of pyroxene chondrules in the Yamato-74191 chondrite (L3) - an electron microscopic study Cooling history of pyroxene chondrules in the Yamato-74191 chondrite (L3) - an electron microscopic study

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..63..189k&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 63, no. 2, May 1983, p. 189-201.

Computer Science

14

Chondrites, Chondrule, Cooling, Meteoritic Composition, Pyroxenes, Calcium, Chemical Composition, Crystallization, Electron Microscopy, Magnesium, Meteorites, Cooling, History, Pyroxene, Chondrules, Yamato Meteorites, Antarctic Meteorites, Yamato 74191, Chondrites, L3 Chondrites, Cores, Electron Microscopy, Texture, Composition, Mantles, Characteristics, Formation, Comparisons, Hypotheses

Scientific paper

The fine textures of clinopyroxene in an excentroradial pyroxene chondrule (EPC) and a comblike pyroxene chondrule (CPC) in the Yamato-74191 chondrite (L3) are investigated by analytical electron microscopy. It is noted that both pyroxenes consist of three regions different in composition and texture: a core, a mantle, and marginal regions. The pyroxenes of the CPC however, are richer in Fe than those of the EPC. The core region is richest in Mg, and there is no Ca component; it commonly exhibits polysynthetic (100) twins. The mantle region is slightly calcic, with the marginal region revealing a rapid increase of Ca outward. It is believed that the polysynthetic twins, cracks, and subgrain boundaries in the core of EPC and CPC must have formed during the transition from prototype to clinotype pyroxenes. The exsolution textures in the mantle and marginal regions suggest initial crystallization of pigeonite-C, followed by decomposition into pigeonite-P and augite.

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