Study on Mineralogical and Petrographic Characteristics of Carbonaceous Chondrite in the Ningqiang Area
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    Abstract:

    Four. chondrites fell in the Ningqiang county,Shanxi province (i. e.Long- titude 105º54 E, Latitude 32º55´N) at 7:00 P.M.of 25 June 1983. About 46068 specimens have been collected. The exterior ofchondrite is a layer of fusion crust, approxrmazery 0.7-1 mm thick. In the interior of chondrite, white gray chondrules and aggregate irregularly disperse through the black matrix, and light yellow troilite and silver gray Awaruite and iron-nickel liamalite are observed. The morphologies of chondrite are circular, elliptic and irregular. According to the crystalline degree, they are glassy, cryptocrystalline, microcrystalline and various porphyritic, grained chondiite texture. The forms of aggregate are more complex. But, they are largely elliptical, irregular and myrmekitic texture. There are more than 30 types in Mineral . compositions.. Transparent miner- als have been found as follows: eorsterite, chrysolite, enstatite, augite, gehlenite, akermanite,spinel, apatite,monetite, .calcite, dolomite, quartz, bytownite and albite. Opaque minerals have been found as follows: troilite, iron-nickel kamalite, pentlandite, magnetite, awaruite, chromite, and uncrystallized carbon. Chemical composition(%): SiO2 33.95 Al2O3 2.74 TiO2 0.134 CaO 2.25 MgO 24.5 NaO 0.55 MnO 0.20 P2O5 0.25 Cr2O3 0.53 Ni 0.95 Co 0.070 Cu 0.032 Zn 0.010 C 0.401 NiS 0.94 (total 99.718) Main chemical parameters; Fe/SiO2 0.72 SiO2/MgO 1.39 The above characteristics show that these chondrites should belong to C3 typc.

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王锡岳,张慧敏,王思潮,吴月珍,1987,宁强碳质球粒陨石的岩石、矿物特征研究[J].岩石矿物学杂志,6(4):296~305. Wang Xiyue, Zhang Huimin, Wang Sichao, Wu Yuezhen Nanjing Laboratory of Rock, Mineral Resourcos, Ministry of Geology, Mineral Resources Nanjing Zijinshan Astronomical Observatory, Academia Sinica,1987,Study on Mineralogical and Petrographic Characteristics of Carbonaceous Chondrite in the Ningqiang Area[J]. Acta Petrologica et Mineralogica,6(4):296~305.

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