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首页> 外文期刊>Journal of Asian earth sciences >Abrupt shifts in the Indian monsoon during the Pliocene marked by high-resolution terrestrial records from the Yuanmou Basin in southwest China
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Abrupt shifts in the Indian monsoon during the Pliocene marked by high-resolution terrestrial records from the Yuanmou Basin in southwest China

机译：以中国西南地区元谋盆地的高分辨率地面记录为特征的上新世期间印度季风突然转变

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摘要

A 650-m-thick sequence of fluvio-lacustrine sediments from the Yuanmou Basin in southwest China was analyzed at 20-cm intervals for grain-size distribution to provide a high-resolution terrestrial record of Indian summer monsoon variations during the Pliocene. The concentrations of the clay and clay-plus-fine-silt fractions are inferred to reflect the water-level status of the lake basin related to the intensity of the Indian summer monsoon and high concentrations reflect high lake levels resulting from the intensified summer monsoon. The frequency of individual lacustrine mud beds is considered to reveal the frequency of the lakes developed in the basin associated with the variability of the Indian summer monsoon and an increased frequency of the lakes reveals an increased variability of the summer monsoon. The proxy data indicate that the Indian summer monsoon experienced two major shifts at 3.57 and 2.78 Ma and two secondary shifts at 3.09 and 2.39 Ma during the Pliocene. The summer monsoon displayed a general trend of gradual intensification during the period of 3.57-2.78 Ma, coeval with an accelerated uplift of the Tibetan Plateau, implying a close link between the monsoon intensification and the plateau uplift. At 2.78 Ma, the summer monsoon was markedly weakened, synchronous with the formation of extensive Northern Hemisphere ice sheets, denoting a quick response of the monsoon regime to the Northern Hemisphere glaciation. The variability of the summer monsoon decreased at 3.09 Ma and increased at 2.39 Ma, presumably suggesting that variations of the Indian monsoon would be modulated by the initiation and periodic fluctuations of ice-sheet covers in Northern Hemisphere high latitudes.
机译：以20 cm的间隔分析了中国西南地区元谋盆地一条650 m厚的河湖相沉积序列，以进行粒度分布，从而提供了印度上新世夏季季风变化的高分辨率地面记录。推测粘土和粘土加细粉部分的浓度反映了与印度夏季风强度有关的湖盆水位，而高浓度则反映了夏季风增强导致的高湖水位。单个湖相泥岩床的频率被认为揭示了与印度夏季风的多变性相关的盆地中湖泊的频率，湖泊频率的增加揭示了夏季风的多变性。代用资料表明，印度上季风在上新世期间经历了两次大的转变，分别为3.57和2.78 Ma，两次经历了第二次的转变，分别为3.09和2.39 Ma。夏季季风在3.57-2.78 Ma期间呈现出逐渐增强的总体趋势，与青藏高原的加速隆升同时期，这意味着季风增强与高原隆升之间存在紧密联系。在2.78 Ma，夏季季风明显减弱，与北半球广泛的冰盖形成同步，表明季风政权对北半球冰期的快速反应。夏季风的变异性在3.09 Ma时降低，而在2.39 Ma时则增加，推测表明印度季风的变化将受到北半球高纬度地区冰盖的形成和周期性波动的调节。

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  • 来源
    《Journal of Asian earth sciences》 |2010年第2期|166-175|共10页
  • 作者

    Zhigang Chang; Jule Xiao; Lianqing Lu; Haitao Yao;

  • 作者单位

    Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Institute of Geology and Geophysics, Chinese Academy of Sciences, 19 Beitucheng West Road, Chaoyang District, Beijing 100029, China;

    Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

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  • 正文语种 eng
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  • 关键词

    yuanmou Basin; fluvio-lacustrine sequence; abrupt shifts; Indian monsoon; pliocene;

    机译：元谋盆地;氟湖序列突然转变;印度季风;世新世;

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