四川甘孜州措普湖沉积物微量元素记录的近200年环境变化 Article Swipe

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M. Liu , Mengying He , Zhujun Hu , Tao Huang , Changchun Huang , Zhigang Zhang , Hong Wang ·

YOU? · · 2024 · Open Access · · DOI: https://doi.org/10.3799/dqkx.2022.107

摘要: 青藏高原东缘分布的小型湖泊由于其特殊的地理位置,受人类活动影响较小,其沉积记录对气候环境变化的响应具有区域性意义,特别在恢复短时间尺度气候及区域沉积环境方面有着独特的优势,然而目前鲜有研究涉及.对四川省甘孜州措普湖湖心45 cm的沉积岩心样品进行了微量元素地球化学分析,重建了当地过去近200年中的气候演变过程.结果表明:近200年来,沉积岩心中稀土元素具有基本相同的垂向变化趋势,均在1841—1920年的小冰期时保持低值,在1890年左右受地震间接影响达到最低值,之后随气候回暖而增加;微量元素主成分分析表明大部分微量元素的变化受区域流域侵蚀风化因子控制,能够反映风化作用的强弱;Rb、Ba、Sr等3种元素受湿度因子主控,指示了区域湿润度的变化.结合多种微量元素环境代用指标及沉积物粒度组成的变化特征,可将措普湖在1841—2017年间的气候环境演化过程划分为5个阶段:冷干(1841—1904年)、温湿(1904—1923年)、温干(1923—1944年)、暖湿(1944—1967年)、暖干(1967—2017年). 关键词: 青藏高原 / 措普湖 / 微量元素 / 沉积环境变化 / 沉积学

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DOI: https://doi.org/10.3799/dqkx.2022.107

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Title: 四川甘孜州措普湖沉积物微量元素记录的近200年环境变化

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Publication year: 2024

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Authors: M. Liu, Mengying He, Zhujun Hu, Tao Huang, Changchun Huang, Zhigang Zhang, Hong Wang

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Landing page: https://doi.org/10.3799/dqkx.2022.107

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abstract_inverted_index.青藏高原东缘分布的小型湖泊由于其特殊的地理位置,受人类活动影响较小,其沉积记录对气候环境变化的响应具有区域性意义,特别在恢复短时间尺度气候及区域沉积环境方面有着独特的优势,然而目前鲜有研究涉及.对四川省甘孜州措普湖湖心45	1
abstract_inverted_index.cm的沉积岩心样品进行了微量元素地球化学分析,重建了当地过去近200年中的气候演变过程.结果表明:近200年来,沉积岩心中稀土元素具有基本相同的垂向变化趋势,均在1841—1920年的小冰期时保持低值,在1890年左右受地震间接影响达到最低值,之后随气候回暖而增加;微量元素主成分分析表明大部分微量元素的变化受区域流域侵蚀风化因子控制,能够反映风化作用的强弱;Rb、Ba、Sr等3种元素受湿度因子主控,指示了区域湿润度的变化.结合多种微量元素环境代用指标及沉积物粒度组成的变化特征,可将措普湖在1841—2017年间的气候环境演化过程划分为5个阶段:冷干(1841—1904年)、温湿(1904—1923年)、温干(1923—1944年)、暖湿(1944—1967年)、暖干(1967—2017年).	2
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