Cathodoluminescence observations of in situ aqueous destruction of chondrules in the Murchison CM chondrite

Details Cathodoluminescence observations of in situ aqueous destruction of chondrules in the Murchison CM chondrite Cathodoluminescence observations of in situ aqueous destruction of chondrules in the Murchison CM chondrite

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1269s&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1269-1270 (SEE N94-20636 05-91

Computer Science

Cathodoluminescence, Chondrites, Chondrule, Dust, Meteoritic Composition, Mosaics, Forsterite, Olivine, Rims

Scientific paper

A low-power cathodoluminescence (CL) mosaic of a 1x2 cm section of the Murchison CM chondrite contains chondrules of two types: one contains olivines with red CL and is thought to be the equivalent of group A chondrules of Sears et.; and one without observable CL, which is probably equivalent to their group B chondrules. Both types of chondrule contain dust mantles with a characteristic uniform red CL due to very fine-grained forsterites, but the mantles of group A chondrules have a complex internal structure and are much thicker than the relatively thin rims on the group B chondrules. The variety of internal textures and the progressive integration of the objects with the surrounding matrix suggests to us that these features are large group A chondrules in the process of being destroyed by aqueous alteration. Prior to aqueous alteration, group A chondrules in CM chondrites were larger than group B chondrules, which is contrary to the situation in ordinary chondrites and were apparently destroyed more rapidly than group B chondrules by aqueous alteration.

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