PETROGRAPHIC AND MINERAL CHEMICAL STUDY OF THE ZHUANGHE AND GUANGMINGSHAN METEORITES
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摘要: 庄河陨石和光明山陨石是两个降落于同一地区的H5型普通球粒陨石.根据两辉石温度计求出这两个陨石的平衡温度< 500℃;根据镍纹石的带宽与组成关系,获得光明山陨石在其母体中的冷却速率约为 10-10℃/Ma,而庄河陨石中普遍出现均一的四方镍纹石表明其冷却速率更低.光明山陨石的冲击变质特征以硅酸盐颗粒破碎为主,其冲击相为S1;庄河陨石中硅酸盐矿物具明显的波状消光,并存在细小的冲击熔融脉,其冲击相划分为S2.Abstract: The Zhuanghe and Guangmingshan meteorites fell in 1976 and 1996, respectively. Both of them fell in Zhuanghe city, Liaoning province, within a distance about 20 km apart. These two meteorites are similar in texture, mineral modal composition and mineral chemistry) and are classified as H5 chondrites. Their final equilibrium temperatures are lower than 500℃ according to the two-pyroxene thermometer. Cooling rate of Guangmingshan in its asteroidal body is 10-100℃/Ma, based on the correlation between the band width and composition of taenite; Zhuanghe probably cooled slower, as indicated by common occurrence of tetrataenite. Guang-mingshan was weakly shocked, showing only fracturing of silicates; it is classified into S1 of shock grade. Undulant distinction of silicates is common in Zhuanghe, and there are also fine-grained impact-induced melt veins, suggesting a shock grade of S2.
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Key words:
- Meteorite /
- Classification /
- Shock /
- Metamorphism
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