| 中中新世以来阿尔金断裂走滑未造成柴达木盆地整体旋转 |
| |
| 引用本文： | 裴军令,周在征,李海兵,孙知明.中中新世以来阿尔金断裂走滑未造成柴达木盆地整体旋转[J].吉林大学学报(地球科学版),2016,46(1):163-174. |
| |
| 作者姓名： | 裴军令 周在征 李海兵 孙知明 |
| |
| 作者单位： | 1. 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, 北京 100081;
2. 中国地质科学院地质研究所/大陆动力学国家重点实验室, 北京 100037 |
| |
| 基金项目： | 中国地质调查局基础研究项目(1212011121267，1212011120964)；国家自然科学基金项目(41172177)Supported by the China Geological Survey Projects(1212011121267，1212011120964)，the National Natural Science Foundation of China(41172177) |
| |
| 摘 要： | 通过柴达木盆地南八仙剖面磁性地层学研究,建立了部分上油砂山组磁极性序列,认为该剖面时代为7.5~9.0 Ma。从320块样品的古地磁数据分析,揭示了一组高温特征剩磁分量,在95%置信度下通过倒转检验(B级),说明这组高温分量很可能代表岩石形成时的原生剩磁,其特征剩磁方向为:地理坐标下为Dg=358.5°, Ig=40.5°, k=28.5,α95=4.2,层面坐标下为Ds=1.0°, Is=41.5°, k=34.0,α95=3.8;相应的极位置为λp=75.9°N, φp=270.5°E, dp=2.8°, dm=4.6°。通过与同时代柴达木盆地及邻区的古地磁极对比,说明中中新世以来柴达木地块整体上没有经历明显旋转运动,阿尔金断裂活动致使肃北等毗邻断裂带地区发生了构造旋转。
|
| 关 键 词： | 柴达木盆地 古地磁 阿尔金断裂 磁性地层 构造旋转 中新世 |
| 收稿时间： | 2015-12-25 |
Strike-Slip of Altyn Tagh Didn't Result in Qaidam Basin Rotation Since Middle-Miocene |
| |
| Pei Junling,Zhou Zaizheng,Li Haibing,Sun Zhiming.Strike-Slip of Altyn Tagh Didn't Result in Qaidam Basin Rotation Since Middle-Miocene[J].Journal of Jilin Unviersity:Earth Science Edition,2016,46(1):163-174. |
| |
| Authors: | Pei Junling Zhou Zaizheng Li Haibing Sun Zhiming |
| |
| Institution: | 1. Institute of Geomechanics, Chinese Academy of Geological Sciences/Key Laboratory of Paleomagnetism and Tectonic Reconstruction, Ministry of Land and Resources, Beijing 100081, China;
2. Institute of Geology, Chinese Academy of Geological Sciences/State Key Laboratory of Continental Tectonic and Dynamics, Beijing 100037, China |
| |
| Abstract: | Based on the magnetostratigraphic study at Nanbaxian section,Qaidam basin,a magnetic polarity sequence of Shangyoushashan Formation has been established.The magnetostratigraphic result suggests the age of 7.5 9.0 Ma.A stable high temperature characteristic remanence component is isolated by stepwise thermal demagnetization from 320 samples through a positive reversal test at the 95% confidence level,which may possibly represent the rock’s primary remanence.The mean direction is D g=358.5°,I g=40.5°,k=28.5,α95 =4.2,D s=1.0°,I s =41.5°,k =34.0,α95 =3.8,corresponding to a paleopole atλp=75.9°N,φp =270.5°E,d p=2.8°,d m=4.6°.In comparison of this paleomagnetic poles from the Qaidam basin with those from adjacent region,no tectonic rotation in Qaidam basin has been identified;however the tectonic rotation of Subei basin has been occurred and resulted from the left-slip of Altyn Tagh fault since Middle-Miocene. |
| |
| Keywords: | Qaidam basin paleomagnetism Altyn Tagh magnetostratigraphy tectonic rotation Miocene |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《吉林大学学报(地球科学版)》浏览原始摘要信息 |
| 点击此处可从《吉林大学学报(地球科学版)》下载免费的PDF全文 |
|
