帕米尔东北缘晚新生代旋转运动新证据

周在征; 裴军令; 李建锋; 刘锋; 盛美; 赵越

doi:10.6038/cjg20160220

帕米尔东北缘晚新生代旋转运动新证据

- 1.
  中国地质科学院地质力学研究所, 北京 100081
- 2. 国土资源部古地磁与古构造重建重点实验室, 北京 100081
- 3. 中国地质大学(北京)地球科学与资源学院, 北京 100083

详细信息

作者简介:
周在征,男,1989年生,硕士研究生,构造地质学专业.E-mail:zzzheng8023@gmail.com

通讯作者: 裴军令,男,副研究员,主要从事区域构造地质与古地磁学研究工作.E-mail:peijunling@yeah.net

中图分类号: P318;P542

收稿日期: 2015-05-04

修回日期: 2015-08-11

上线日期: 2016-02-05

New evidence for rotation of Northeastern Pamir since Late Cenozoic

- 1.
  Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
- 2. Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Land and Resources, Beijing 100081, China
- 3. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China

More Information

Corresponding author: PEI Jun-Ling, E-mail: peijunling@yeah.net

Received Date: 04 May 2015

Revised Date: 11 August 2015

Available Online: 05 February 2016

摘要

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.
- 帕米尔 /
- 晚新生代 /
- 古地磁 /
- 构造旋转 /
- 喀什凹陷
Abstract: The Pamir-western Himalayan syntaxis lies at the western end of the India-Asia collision zone and is bounded by the Main Pamir Thrust to the north, and the Main Boundary Thrust and Main Frontal Thrust to the south. To facilitate the study on the deformation history of the northeastern Pamir in response to the India-Asia collision, paleomagnetic samples were collected from 11 sites in the Pliocene sedimentary rock adjacent to the western Kunlun mountains. A stable magnetic component was isolated by stepwise thermal demagnetization of 111 samples from this section, which is characterized by a positive C-class reversal test. The mean direction of residual magnetism is Dg=342.4°, Ig=59.2°, κg=32.3,α95=8.6°; Ds=352.4°, Is=49.9°, κs=59.1,α95=6.3°,corresponding to a paleopole at λp＝79.7°N, φp=295.9°E, dp=5.6°, dm=8.4°, α95=6.9°.#br#The paleomagnetic study on sedimentary rock developed in the Tarim basin offers a useful method for researching tectonic evolution. Combining with geomorphology and GPS data, our results suggest that the Yengisar anticline has undergone significant counterclockwise rotation since Pliocene. Comparisons of this paleomagnetic pole with adjacent regions imply the tectonic rotation in Kashi depression is associated with Northeastern Pamir evolution during the late Cenozoic.
- Pamir /
- Late Cenozoic /
- Paleomagnetism /
- Tectonic rotation /
- Kashi depression

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帕米尔东北缘晚新生代旋转运动新证据

作者简介: 周在征,男,1989年生,硕士研究生,构造地质学专业.E-mail:zzzheng8023@gmail.com

通讯作者: 裴军令,男,副研究员,主要从事区域构造地质与古地磁学研究工作.E-mail:peijunling@yeah.net

New evidence for rotation of Northeastern Pamir since Late Cenozoic

Corresponding author: PEI Jun-Ling, E-mail: peijunling@yeah.net

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作者简介:
周在征,男,1989年生,硕士研究生,构造地质学专业.E-mail:zzzheng8023@gmail.com