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EW-trending uplifts along the southern side of the central segment of the Altyn Tagh Fault, NW China: Insight into the rising mechanism of the Altyn Mountain during the Cenozoic

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Abstract

The Altyn Tagh Fault and the Altyn Mountain define respectively the tectonic and geographical northern edges of the Tibetan Plateau, and figure prominently in the growth and rising mechanism of the plateau. The rhombus-shaped Altyn Mountain has long been thought to have an intimate relation with the Altyn Tagh Fault; however, its formation mechanism remains unclear and debatable. In this paper, we focus on the EW-trending uplifts in the Altyn Mountain, and investigated three Cenozoic sedimentary sections in the vicinity of the EW-trending uplifts located along the southern side of the central segment of the Altyn Tagh Fault. Magnetostratigraphy and pollen analysis were used to constrain ages of the sediments. Clast composition of conglomerate and paleocurrents obtained from clast imbrications were applied to determine the provenance. We also established a geological section parallel to the Altyn Tagh Fault on sedimentary facies across the northwestern Qaidam Basin. The results indicate that these en-echelon EW-trending uplifts formed as early as ca. 36 Ma and were preferred to be under the control of basal shear of the Altyn Tagh Fault in the middle-lower crust, symbolizing the early uplift of the Altyn Mountain during the Cenozoic. Left-slip along the Altyn Tagh Fault occurring during the Miocene and afterwards displaced and altered these uplifts, shaping the Altyn Mountain to its present fabric.

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Authors and Affiliations

  1. Department of Earth Sciences, Zhejiang University, Hangzhou, 310027, China

    Lei Wu, AnCheng Xiao, LiGuang Mao, YouPu Dong & Bo Xu

  2. Research Center for Structures in Oil & Gas Bearing Basins, Ministry of Education, Hangzhou, 310027, China

    Lei Wu, AnCheng Xiao, LiGuang Mao, YouPu Dong & Bo Xu

  3. Research Center of Qinghai Oilfield Company, PetroChina, Dunhuang, 736200, China

    LiQun Wang

  4. Beijing Geological Survey, Beijing, 102206, China

    Liang Wang

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  1. Lei Wu
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Wu, L., Xiao, A., Wang, L. et al. EW-trending uplifts along the southern side of the central segment of the Altyn Tagh Fault, NW China: Insight into the rising mechanism of the Altyn Mountain during the Cenozoic. Sci. China Earth Sci. 55, 926–939 (2012). https://doi.org/10.1007/s11430-012-4402-7

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