Polymict structure of the Mezö-Madaras chondrite

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Scientific paper

Most of the Mezö-Madaras chondrite is similar to other "unequilibrated ordinary chondrites" in that the chondritic texture is excellently preserved, the olivine and pyroxene are of very heterogeneous compositions, and several of the chondrules contain primary sodium-aluminum-silicate glasses. In addition to the normal chondritic material, several fragmental inclusions of other types of chondritic material occur in Mezö-Madaras. One type, which consists of very small chondrules and silicates, sulfide, and metal in a black, opaque, carbonaceous matrix, is similar in texture to some of the Type 2 carbonaceous chondrites, although apparently not chemically equivalent. Other inclusions more closely resemble ordinary chondritic material, but the silicates show a range of equilibration and are more homogeneous than in most of Mezö-Madaras. One inclusion of this type also contains abundant secondary glass interstitial to the olivine, pyroxene and other grains. The polymict structure in Mezö-Madaras is unlike the structure in light-dark meteorites (e.g. Pantar) and is interpreted as the result of catastrophic mixing of surface and near-surface material on the chondritic parent body during or after its formation. This mixing may have originated through either impact or volcanic processes.

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