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Microstructures and Shock-Metamorphic Features of Minerals in Unmelted Chondritic Rock

  • Xiande XieEmail author
  • Ming Chen
Chapter
  • 16 Downloads

Abstract

Several shock effects were developed in unmelted minerals in the Yanzhuang meteorite, which include cracks, fractures, mosaic texture, dislocation, lamella, brecciation, structure disorder, and solid-state phase transition. Displectic glasses of olivine and pyroxene, and the high-pressure polymorphs of olivine and pyroxene, ringwoodite and majorite, had been firstly discovered in this H-group chondrite. Subgrain textures produced by solid-state recrystallization of silicate minerals have been found in the strongly deformed chondritic areas and the blackened chondritic areas of the meteorite. Kamacite in the blackened chondritic areas occurs as martensite which is characterized as ultrafine lath-shaped microstructures, and that in the strongly deformed chondritic areas occurs as microcrystalline aggregate. Kamacite and taenite in the weakly deformed chondritic areas occur as single crystal or polycrystalline aggregate, in which some contain Neuman’s lines.

Keywords

H-chondrite Shock features Mosaicism Dislocations Brecciation Phase transition 

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Copyright information

© Guangdong Science & Technology Press Co., Ltd and Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhouChina

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