MECHANISM AND OWNERSHIP OF TECTONIC DOMAIN OF THE CENOZOIC NW-TRENDING SHEAR TECTONIC SYSTEM IN CHINA AND ITS SOUTH WEST ADJACENT AREA
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摘要: NW向扭动构造体系广泛发育于中国西部并向中国东部延伸,且呈多字型特征,但在中国东部规模等级较小,断续相循,成生活动时期很新(晚白垩世末至早第三纪以来),由NW向褶皱、NWW向压扭性走滑、NNW向扭压性走滑和NEE向张扭性走滑组成。偏共轭剪切形成之NWW向扭动构造向中西部延伸并复合叠加在西域系(古河西系)之上。它是印度板块与欧亚板块会聚在中国大陆板内碰撞效应的产物,与中国东部和中国西部已经厘定的其他构造体系有着完全不同的应力活动方式。Abstract: The Cenozoic NW-trending compress-shearing tectonic system is well-developed in the west China and extends intermittently to the east China. Although the NW-trending tectonic system consists of NW striking folds,WNW and NNW trending compress-shearing faults as well as NEE trending tensional-shearing faults,the tectonic direction is better developed in the WNW because of the effect of partial conjugate shearing. The formation of the Cenozoic NW-trending System,which usually is superimposed on the Paleo-Hexi System or "the West Domain System",is related to intraplate deformation resulting from the collision between the India Plate and the Europe-Asian Plate since the end of the Late-Cretaceous or the Eocene.
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