帕米尔东北缘晚新生代旋转运动新证据

发布时间：2018-01-09 07:24

本文关键词：帕米尔东北缘晚新生代旋转运动新证据　出处：《地球物理学报》2016年02期 　论文类型：期刊论文

【摘要】：为进一步研究帕米尔东北缘晚新生代演化特征,在塔里木盆地西部英吉沙背斜上新世地层中采集了11个采点共111块古地磁样品.对样品进行系统热退磁测定,揭示了一组高温特征剩磁分量,获得了采样剖面的上新世古地磁极.特征剩磁方向为:Dg=342.4°,Ig=59.2°,κg=32.3,α95=8.6°;Ds=352.4°,Is=49.9°,κs=59.1,α95=6.3°,相对应的古地磁极位置为:79.7°N,295.9°E,dp=5.6°,dm=8.4°,α95=6.9°.这一高温分量通过了倒转检验,代表了研究区上新世时期的原生特征剩磁.通过对英吉沙背斜周缘断裂及形成的大地构造背景分析,结合其地貌特征、GPS数据,认为英吉沙背斜在开始形成至今经历了明显的逆时针构造旋转,该旋转同晚新生代以来帕米尔东北缘喀什凹陷发生刚性构造旋转运动有着密切的关系.
[Abstract]:In order to further study the evolution characteristics of the late Cenozoic in the northeastern margin of Pamir. A total of 111 paleomagnetic samples were collected from the Pliocene strata of the Yingjisha anticline in the western Tarim Basin. The systematic thermal demagnetization measurements of the samples revealed a group of remanent magnetic components with high temperature characteristics. The Pliocene paleomagnetic poles are obtained in the sampling section. The characteristic remanent magnetic directions are: 1: DG 342.4 掳IGN 59.2 掳, 魏 g 32.3, 伪 95N 8.6 掳; The paleomagnetic pole position of Ds=352.4 掳is 49.9 掳, 魏 sm 59.1 掳, 伪 95N 6.3 掳, and the corresponding paleomagnetic pole position is 295.9 掳E. Dp=5.6 掳dmg is 8.4 掳and 伪 95 掳is 6.9 掳. This high temperature component has passed the inversion test. It represents the primary remanence of the Pliocene in the study area. Through the analysis of the faults around the Yingjisha anticline and the tectonic background of the formation, the GPS data are combined with its geomorphological features. It is considered that the Yingjisha anticline has experienced an obvious counterclockwise tectonic rotation since its formation, which is closely related to the rigid tectonic rotation in Kashi sag in the northeastern margin of Pamir since the late Cenozoic.
【作者单位】：中国地质科学院地质力学研究所;国土资源部古地磁与古构造重建重点实验室;中国地质大学(北京)地球科学与资源学院;
【基金】：国家自然科学基金面上项目(41172177)资助
【分类号】：P542
【正文快照】： 5.6°,dm=8.4°,α95=6.9°.The paleomagnetic study on sedimentary rock developed in the Tarim basin offers a usefulmethod for researching tectonic evolution.Combining with geomorphology and GPS data,ourresults suggest that the Yengisar anticline has under

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