【摘要】 1998~2000年完成的青藏高原中西部航磁数据的综合分析结果显示,在青藏高原中部存在一个重要的隐伏断裂带(大致沿革吉北—改则南—错勤北—申扎北)。结合藏东位场分析结果,革吉北—改则南—错勤北—申扎北隐伏断裂可与嘉黎走滑断裂相连。沿该隐伏断裂发生的地震震源机制解显示,该断裂性质与嘉黎走滑断裂相同。因此,该隐伏断裂与位于藏东的嘉黎走滑断裂一起构成了位于高原中部的东西走向的巨型走滑断裂。这种推测得到了相关地质、地球物理证据和数值模拟结果的证实。此外,该巨型走滑断裂可能调节着青藏高原内部的应力分布,从而控制着高原内部的变形特征。更多还原

【Abstract】 To study regional tectonics in the mid-western Tibet plateau, the data of areomagnetic anomaly suveryed from 1998 to 2000 is reprocessed by upward continuation method.The results of diffe-rent upward continuation levels reveal a significant anomaly of a subtle fault which located between the northern margin of Lhasa terrane and south side of Banggonghu-Nujing Suture,about along Geji North to Gaze South to Cuoqen North to Shenza North,from west to east.Combined with other results,this subtle fault,together with Jiali strike-slip fault,forms a large-scale E-W strike-slip fault in the central Tibet.And the conclusion is also supported by other evidences from surface geology,geophysics and modeling.The E-W strike-slip faults control the force distribution and deformation within Tibet plateau.更多还原