PETROLOGIC CHARACTERISTICS AND CLASSIFICATION OF THE XINING METEORITE

doi:10.3724/SP.J.1084.2013.00394

Abstract

Abstract: Xining meteorite has a typically chondritic texture. The matrix displays a moderate to high degree of recrystallization, most plagioclase grains are around 5-40μm and a few grains greater than 50μm in diameter . Chemical compositions of olivine and low-Ca pyroxene in Xining meteorite are homogeneous: eg. olivine (Fa 24.7-25.2，avg. Fa 24.9, PMD 0.64%); low-Ca pyroxene ( Fs 21.3-21.9, avg. Fs 21.5, PMD 0.84%; En 77.6-78.2, avg. En 78.6; Wo 0.46-0.57, avg. Wo 0.46). This feature indicates that olivine and low-Ca pyroxene in Xining meteorite are in thermodynamic equilibrium and Xining meteorite should belong to an equilibrated ordinary chondrite. Based on the textural characteristics，metal abundance, chemical composition of silicate minerals and thermal metamorphic characteristics(the equilibrium temperature is 778℃), Xining meteorite is a L5 ordinary chondrite and beginning to change a L6. The degrees of shock metamorphism and terrestrial weathering are S3 and W0, respectively. The parent body of Xining meteorite had suffered impact and thermal metamorphism, which had resulted in fragmentation of chondrules, devitrification of glass, and recrystallization of matrix.

Key words: Xining meteorite, Ordinary chondrite, Equilibrated type, L5, Meteorite fall

Chen Hongyi，Miao Bingkui，Liu Xijun，Xie Lanfang，Xia Zhipeng，Chen Lifei. PETROLOGIC CHARACTERISTICS AND CLASSIFICATION OF THE XINING METEORITE[J]. ADVANCES IN POLAR SCIENCE, 2013, 25(4): 394-402.

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PETROLOGIC CHARACTERISTICS AND CLASSIFICATION OF THE XINING METEORITE

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