Calcium-aluminium-rich chondrules in the unequilibrated ordinary chondrites

Details Calcium-aluminium-rich chondrules in the unequilibrated ordinary chondrites Calcium-aluminium-rich chondrules in the unequilibrated ordinary chondrites

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982metic..17...55n&link_type=abstract

Meteoritics, vol. 17, June 30, 1982, p. 55-63.

Other

7

Aluminum, Calcium, Chondrites, Chondrule, Meteoritic Composition, Carbonaceous Chondrites, Chemical Composition, Meteoritic Microstructures, Olivine, Spinel

Scientific paper

Calcium-aluminum-rich chondrules were found in L-3 (ALH-77015) and LL-3 (ALH-77278) chondrites. They consist of spinel, olivine, fassaite and glassy groundmass enriched in anorthite component. The bulk chemical compositions of the two chondrules are nearly the same and resemble those of the calcium-aluminum-rich inclusions in the carbonaceous chondrites, but the former is more enriched in MgO and SiO2 and depleted in Al2O3 and CaO. The calcium-aluminum-rich chondrules would have been primarily early condensates which existed at the place where the chondrules were formed, and heated up to 1400 C or higher to have melted and cooled at the rate similar to those for other chondrules, or the products of intensive heating followed by reaction with gas.

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