Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (1): 163-174.doi: 10.13278/j.cnki.jjuese.201601114

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Strike-Slip of Altyn Tagh Didn't Result in Qaidam Basin Rotation Since Middle-Miocene

Pei Junling1, Zhou Zaizheng1, Li Haibing2, Sun Zhiming1   

  1. 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
  • Received:2015-12-25 Online:2016-01-26 Published:2016-01-26
  • Supported by:

    Supported by the China Geological Survey Projects (1212011121267, 1212011120964) and the National Natural Science Foundation of China (41172177)

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 Dg=358.5°, Ig=40.5°, k=28.5,α95=4.2, Ds=1.0°, Is=41.5°, k=34.0,α95=3.8,corresponding to a paleopole at λp=75.9°N, φp=270.5°E, dp=2.8°, dm=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.

Key words: Qaidam basin, paleomagnetism, Altyn Tagh, magnetostratigraphy, tectonic rotation, Miocene

CLC Number: 

  • P539.3

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