胶东东部中生代走滑逆冲构造带的超微构造研究
Ultramicrostructure of the Mesozoic strike-slip thrust belt in ｅastern Jiaodong
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摘要: 提要：胶东东部区域上处于秦岭—大别—苏鲁造山带的东端，是中生代的走滑逆冲构造带。进行超微构造研究有利于解决岩石的变形机制问题。应用偏光显微镜和透射电子显微镜方法，进行了胶东东部走滑逆冲构造带显微构造及超微构造研究。研究认为主要走滑逆冲剪切带的石英位错亚构造以线位错为主，并常见位错环、位错弓弯、位错壁、位错列、位错网及亚晶粒等构造型式颗粒等。石英超微位错构造总体反映的是中温或低温塑性变形环境；石岛剪切带、荣成剪切带、牟平剪切带的平均古差异应力值呈现逐渐降低的趋势，跟温度呈反相关的关系。Abstract: Abstract：Eastern Jiaodong, regionally located at the eastern end of the Qinling-Dabie-Sulu orogenic belt, is a Mesozoic strike-slip thrust belt. The study of ultramicroscopic structure is favorable to solving the problem of deformation mechanisms of rocks. Microstructure and ultramicrostructure of the strike-slip thrust belt in eastern Jiaodong have been studied using both microscopy and TEM. Study indicates that the dislocation substructure of quartz in the main strike-slip thrust shear zone is dominated by linear dislocation, and in addition, dislocation loops, bow-out, walls, arrays and net and subgrains are also common. A middle- to low-temperature, plastic deformation environment. can be deduced from the ultramicroscopic dislocation structures of quartz. Furthermore, the average differential paleo-stress values of the Shidao, Rongcheng and Mouping shear zones show a trend of gradual decrease, which seems to be inversely correlated with the trend of temperatures.
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Keywords:
- eastern Jiaodong /
- strike-slip thrust belt /
- ultramicrostructure
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