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《Acta Mineralogica Sinica》 1992-02
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A STUDY OF ULTRAMICROSTRUCTURES IN LOW-CALCIUM PYROXENES FROM THE ZHAODONG CHONDRITE

Huang Wankang~(1)) Wang Yanguo~(2)) Wang Daode~(1)) Gong Guohong~(1)) 1) (Guangzhoa Branch, Institute of Geochemistry, Academia Sinlca, Guangzhou, 510640) 2) (Institute of Metal Research, Academia Sinica, Shengyang,110015)  
It has been recognized that the ultramicrostructures of pyroxenes can play an important role in thermal equilibration during cooling. UnderHRTEM observations of pyroxenes in the Zhaodong chondrite, very interesting ultramicrostructures including the phase transformation of clino→orthopyroxene, 2.7nm long-period structure and odd-layered stacking defects have been found.Abundant odd-layered stacking sequences in the Zhaodong chondrite, which were rarely observed in nature, are completely, coherent with (100) of pyroxenes and occurred as isolated blocks, in orthopyroxenes or as two repeti tions in highly disordered region of clinopyroxenes. The. new feature of 1.35 nm blocks in pyroxenes exposed by high resolution images is repeated for two times. Based on the lattice images, the "A+B+A-" stacking sequence of Si-O chains and octahedral layers proposed here would never be confused with Opx+Cpx no matter how many times it will repeats. According to the presence only in type-3 and -4 chondrites, the odd-layered stacking of octahedra is considered to be produc ed from the conversion of protopyroxenes by quenching and could be used as a typical ultramicrostructure without suffering later thermal metamorphism.The preservations of original ultramicrostructures of 1.35nm blocks and highly disordered region with 2.7nm structures in pyroxenes which formed before or during accrection imply that the Zhaodong chondrite was produced by a complex accretion process. In this complex process, some material accreting on a hot but cooling parent body could be rapidly heated to an extremely high temperature or ejected, quenched and accreted again. Thus some material accreting early might begin to attain equilibrium, while that accreting later could still maintain the original ultramicrostructures and textures. The facts mentioned above imply that the Zhaodong chondrite is considered to be formed by the retrograde process without suffering later thermal metamorphism.
【Fund】: 国家自然科学基金
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【References】
Chinese Journal Full-text Database 2 Hits
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1 Wang Daode Hou Wei Chen Yongheng Lin Wenzhu(Institute of Geochemistry, Acadcmia Simca, Guiyang);STUDIES OF WU'AN AND LAOCHENG METEORITES RECENTLY FALLEN IN CHINA[J];Geochimica;1989-03
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