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卫星图像分析显示 ,青藏高原东北隅存在非常清晰的毛毛山 -南华山 -六盘山、香山 -天景山、烟筒山、牛首山 -罗山 4条弧形断裂带和南鄂尔多斯环形构造。分析了弧形构造的运动特征和南鄂尔多斯环形构造的形态 ,认为青藏高原东北隅弧束断裂的成因是印度板块向NNE俯冲导致青藏高原NEE向移动所产生的推挤力 ,受到南鄂尔多斯环形构造的阻挡 ,形成了 4条向固原、泾原收敛 ,向NWW、NW方向撒开的弧束断裂。造成撒开部分NWW—NNW向断裂左旋走滑、NW—SN向断裂右旋走滑、收敛部分逆冲挤压的特征。
Satellite image analysis shows that there are four distinct faults in the northeastern margin of the Qinghai-Tibet Plateau, namely, Mao-Mao-Nanhuashan-Liupanshan, Xiangshan-Tianjingshan, Zhumuposhan, Niushou-Luoshan arcs and the South Ordos ring structure. The movement characteristics of the arc structure and the ring structure of the South Ordos are analyzed. It is considered that the origin of the northeastern arc beam fault in the Qinghai-Tibet Plateau is the thrust force caused by NEE subduction of the Indian plate to the NEE movement of the Qinghai-Tibet Plateau and is affected by the circular structure of the South Ordos Of the block, forming a 4 to the Guyuan, Jing original convergence, to the NWW, NW direction of the open arc beam break. Resulting in NWW-NNW spreading left-slip strike and NW-SN strike-slip strike and convergent thrust-crushing.