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为了确定皮羌断裂新生代的构造演化特征,在野外地质调查和地震资料解释的基础上,通过对比皮羌断裂和色力布亚断裂的构造变形特征,揭示了皮羌断裂新生代以来的活动特征,确定了其左旋走滑位移形成的原因.研究结果表明:皮羌断裂新生代以来发生了两期明显的构造变形.中新世末,该断裂受帕米尔突刺向北楔入在塔里木盆地西部产生的由西向东的挤压应力的影响,发生了一期强烈的、自东向西的逆冲变形,这期逆冲变形导致皮羌断裂东西两侧中寒武统滑脱层的埋深差约2km.上新世以来,伴随着南天山向塔里木盆地内逆冲,柯坪冲断带近东西向的逆冲推覆构造强烈活动.皮羌断裂东西两侧滑脱层深度的差异导致其两侧形成的逆冲推覆体数量和间距明显不同,这种构造变形的不协调导致皮羌断裂发生明显的左旋走滑位移.
In order to confirm the tectonic evolution characteristics of the Piqiang fault in the Cenozoic, based on the field geological survey and the seismic data interpretation, we compared the tectonic deformation characteristics of the Piqiang fault and the Keruibuya fault to reveal the activities since the Cenozoic of the Piqiang fault The results show that there are two obvious tectonic deformations since the Cenozoic Piqiang fault.At the end of Miocene, the fault was wedged northward by the Pamir spines in the Tarim Basin In the western region, the compressional stress from west to east exerted a strong thrust deformation from east to west. During this period of thrust deformation, the depth of middle-Cambrian slip-off on both sides of the Piqiang fault was buried About 2km. Pliocene epicenospheric thrusting in the Near East-West thrust belt occurred along with the thrusting of the southern Tianshan Mountains into the Tarim Basin, and the difference in the depth of skidding on both sides of the Piqiang fault resulted in The number and spacing of thrust nappe formed on both sides are obviously different. The uncoordination of this tectonic deformation leads to obvious left-lateral strike-slip displacement of the Piqiang fault.