First recorded find of ordinary chondrite material in the Kaidun meteorite

Details First recorded find of ordinary chondrite material in the Kaidun meteorite First recorded find of ordinary chondrite material in the Kaidun meteorite

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sosyr..39..150i&link_type=abstract

Solar System Research, Volume 39, Issue 2, pp.150-156

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For the first time, ordinary chondrite material—the most common type among the present-day fall meteorite—has been found in the unique Kaidun breccia. The discovered object is a large unequilibrated olivine-pyroxene porphyritic chondrule, with peripheral and central zones of different structures, suggesting different crystallization regimes. In chemical composition, the chondrule corresponds to unequilibrated ordinary chondrites of petrological type 3; it is enriched in lithophile elements and depleted in siderophiles, indicating formation by melting of the parent material, which preceded or was accompanied by metal-silicate fractionating. The chondrule material was subjected to aqueous alteration that formed smectite and calcite in the cavities and veins of its central part. The anomalous oxygen isotopic compositions of the chondrule are evidence of an oxygen reservoir different from known types of meteorites, including the ordinary-chondrite chondrules. Thus, the unique breccia Kaidun contains ordinary chondrite material along with carbonaceous and enstatite chondrite material, products of early nebular processes, and highly differentiated planetary-type material.

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