Cenozoic Vertical-Axis Rotations of the Hoh Xil Basin, Central–Northern Tibet
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We would like to express our gratitude to the journal editors and reviewers for their helpful discussions and constructive comments to improve the manuscript. We wish to extend our most sincere gratitude to Dr. Weiwei Chen and Christopher Xiao for their assistances during discussions. This study was supported by the National Natural Science Foundation of China (NSFC) under grant No. 41102064 and 41230313, and US National Science Foundation project EAR 1250444.


Cenozoic Vertical-Axis Rotations of the Hoh Xil Basin, Central–Northern Tibet
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We would like to express our gratitude to the journal editors and reviewers for their helpful discussions and constructive comments to improve the manuscript. We wish to extend our most sincere gratitude to Dr. Weiwei Chen and Christopher Xiao for their assistances during discussions. This study was supported by the National Natural Science Foundation of China (NSFC) under grant No. 41102064 and 41230313, and US National Science Foundation project EAR 1250444.

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    摘要:

    Understanding the Cenozoic vertical-axis rotation in the Tibetan Plateau is crucial for continental dynamic evolution. Paleomagnetic and rock magnetic investigations were carried out for the Oligocene and Miocene continental rocks of the Hoh Xil basin in order to better understand the tectonic rotations of central Tibet. The study area was located in the Tongtianhe area located in the southern part of the Hoh Xil basin and northern margin of the Tanggula thrust system in central-northern Tibet. A total of 160 independently oriented paleomagnetic samples were drilled from the Tongtianhe section for this study. The magnetic properties of magnetite and hematite have been recognized by measurements of magnetic susceptibility vs. temperature curves and unblocking temperatures. The mean directions of the Oligocene Yaxicuo Group in stratigraphic coordinates (Declination/Inclination = 354.9°/29.3°, k = 33.0, α95 = 13.5°, N =5 Sites) and of the Miocene Wudaoliang Group in stratigraphic coordinates (Declination/Inclination = 3.6°/36.4°, k = 161.0, α95 = 9.7°, N =3 Sites) pass reversal tests, indicating the primary nature of the characteristic magnetizations. Our results suggested that the sampled areas in the Tuotuohe depression of the Hoh Xil basin have undergone no paleomagnetically detectable rotations under single thrusting from the Tanggula thrust system. Our findings, together with constraints from other tectonic characteristics reported by previous paleomagnetic studies, suggest tectonic rotations in the Cuoredejia and Wudaoliang depressions of the Hoh Xil basin were affected by strike-slip faulting of the Fenghuo Shan-Nangqian thrust systems. A closer examination of geological data and different vertical-axis rotation magnitudes suggest the tectonic history of the Hoh Xil basin may be controlled by thrust and strike-slip faulting since the Eocene.

    Abstract:

    Understanding the Cenozoic vertical-axis rotation in the Tibetan Plateau is crucial for continental dynamic evolution. Paleomagnetic and rock magnetic investigations were carried out for the Oligocene and Miocene continental rocks of the Hoh Xil basin in order to better understand the tectonic rotations of central Tibet. The study area was located in the Tongtianhe area located in the southern part of the Hoh Xil basin and northern margin of the Tanggula thrust system in central-northern Tibet. A total of 160 independently oriented paleomagnetic samples were drilled from the Tongtianhe section for this study. The magnetic properties of magnetite and hematite have been recognized by measurements of magnetic susceptibility vs. temperature curves and unblocking temperatures. The mean directions of the Oligocene Yaxicuo Group in stratigraphic coordinates (Declination/Inclination = 354.9°/29.3°, k = 33.0, α95 = 13.5°, N =5 Sites) and of the Miocene Wudaoliang Group in stratigraphic coordinates (Declination/Inclination = 3.6°/36.4°, k = 161.0, α95 = 9.7°, N =3 Sites) pass reversal tests, indicating the primary nature of the characteristic magnetizations. Our results suggested that the sampled areas in the Tuotuohe depression of the Hoh Xil basin have undergone no paleomagnetically detectable rotations under single thrusting from the Tanggula thrust system. Our findings, together with constraints from other tectonic characteristics reported by previous paleomagnetic studies, suggest tectonic rotations in the Cuoredejia and Wudaoliang depressions of the Hoh Xil basin were affected by strike-slip faulting of the Fenghuo Shan-Nangqian thrust systems. A closer examination of geological data and different vertical-axis rotation magnitudes suggest the tectonic history of the Hoh Xil basin may be controlled by thrust and strike-slip faulting since the Eocene.

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RAN Bo, ZHAO Xixi, LIU Zhifei, WANG Chengshan, ZHU Lidong, JIN Wei, LI Yalin.2016. Cenozoic Vertical-Axis Rotations of the Hoh Xil Basin, Central–Northern Tibet[J]. ACTA GEOLOGICA SINICA(English edition),90(3):858~869

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  • 收稿日期:2015-09-28
  • 最后修改日期:2015-12-10
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  • 在线发布日期: 2016-06-21
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