Chronological Link Between the Abrupt Change of the Loess Grain Size Sequence and the Formation of River Terraces on the Eastern Margin of the Qinghai-Tibetan Plateau Since the Late Early-Pleistocene
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Financial support was provided by the National Science Foundation of China grant (40472088).


Chronological Link Between the Abrupt Change of the Loess Grain Size Sequence and the Formation of River Terraces on the Eastern Margin of the Qinghai-Tibetan Plateau Since the Late Early-Pleistocene
Author:
  • LIU Dongyan

    LIU Dongyan

    1 College of Marine Geoscience, Ocean University of China, Qingdao 266100, China; 2 Key Laboratory of Submarine Science and Prospecting Techniques, Ministry of Education, Qingdao 266100, China; 3 Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China; 4 College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;5 Department of?Meteorology, University of Hawaii at Manoa, Honolulu 96822, USA
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  • QIAO Yansong

    QIAO Yansong

    1 College of Marine Geoscience, Ocean University of China, Qingdao 266100, China; 2 Key Laboratory of Submarine Science and Prospecting Techniques, Ministry of Education, Qingdao 266100, China; 3 Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China; 4 College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;5 Department of?Meteorology, University of Hawaii at Manoa, Honolulu 96822, USA
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  • LI Weiran

    LI Weiran

    1 College of Marine Geoscience, Ocean University of China, Qingdao 266100, China; 2 Key Laboratory of Submarine Science and Prospecting Techniques, Ministry of Education, Qingdao 266100, China; 3 Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China; 4 College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;5 Department of?Meteorology, University of Hawaii at Manoa, Honolulu 96822, USA
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  • XIE Ruihuang

    XIE Ruihuang

    1 College of Marine Geoscience, Ocean University of China, Qingdao 266100, China; 2 Key Laboratory of Submarine Science and Prospecting Techniques, Ministry of Education, Qingdao 266100, China; 3 Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China; 4 College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;5 Department of?Meteorology, University of Hawaii at Manoa, Honolulu 96822, USA
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  • PENG Shasha

    PENG Shasha

    1 College of Marine Geoscience, Ocean University of China, Qingdao 266100, China; 2 Key Laboratory of Submarine Science and Prospecting Techniques, Ministry of Education, Qingdao 266100, China; 3 Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China; 4 College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;5 Department of?Meteorology, University of Hawaii at Manoa, Honolulu 96822, USA
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Fund Project:

Financial support was provided by the National Science Foundation of China grant (40472088).

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    摘要:

    Based on the study of magnetostratigraphy, magnetic susceptibility and grain size of Garzê A section on the southeastern margin of the Qinghai-Tibetan Plateau since the late early-Pleistocene, the basal age of Garzê loess is located at ~1.16?MaBP and a series of abrupt paleoclimatic changes is detected. The times of abrupt changes are of distinct series features, and the interval between each two adjacent abrupt changes is ~50 kyr or ~100?kyr. The most significant abrupt changes occur at around 1.06, 0.85, 0.6, 0.46, 0.39 and 0.14?MaBP. There is a chronological link between the abrupt changes of paleoclimate and the formation of river terraces and it is almost simultaneous with a strengthening trend of neotectonic activities. Therefore, maybe the climatic transition controll the timing of terrace formation, and the tectonic uplift originate potential energy and has a direct effect on channel incision, both the climatic transition and the tectonic uplift are important. Terraces are the products of the interaction of instable climatic variations and tectonic uplift. Like the loess-paleosol sequences, river terrace sequences are also controlled by the climate-tectonic coupling system and are ruled by climate-tectonic gyration with a ~100?kyr paracycle, which may be the short eccentricity period of the earth.

    Abstract:

    Based on the study of magnetostratigraphy, magnetic susceptibility and grain size of Garzê A section on the southeastern margin of the Qinghai-Tibetan Plateau since the late early-Pleistocene, the basal age of Garzê loess is located at ~1.16?MaBP and a series of abrupt paleoclimatic changes is detected. The times of abrupt changes are of distinct series features, and the interval between each two adjacent abrupt changes is ~50 kyr or ~100?kyr. The most significant abrupt changes occur at around 1.06, 0.85, 0.6, 0.46, 0.39 and 0.14?MaBP. There is a chronological link between the abrupt changes of paleoclimate and the formation of river terraces and it is almost simultaneous with a strengthening trend of neotectonic activities. Therefore, maybe the climatic transition controll the timing of terrace formation, and the tectonic uplift originate potential energy and has a direct effect on channel incision, both the climatic transition and the tectonic uplift are important. Terraces are the products of the interaction of instable climatic variations and tectonic uplift. Like the loess-paleosol sequences, river terrace sequences are also controlled by the climate-tectonic coupling system and are ruled by climate-tectonic gyration with a ~100?kyr paracycle, which may be the short eccentricity period of the earth.

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LIU Dongyan, QIAO Yansong, LI Weiran, XIE Ruihuang, PENG Shasha.2011. Chronological Link Between the Abrupt Change of the Loess Grain Size Sequence and the Formation of River Terraces on the Eastern Margin of the Qinghai-Tibetan Plateau Since the Late Early-Pleistocene[J]. ACTA GEOLOGICA SINICA(English edition),85(3):723~732

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  • 收稿日期:2010-12-01
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