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中国沙漠  2014 

共和盆地黏土矿物与孢粉记录的末次冰消期以来的气候环境相位差

DOI: 10.7522/j.issn.1000-694X.2013.00445

Keywords: 共和盆地,黏土矿物,孢粉,气候环境相位差

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Abstract:

在青藏高原北缘共和盆地达连海钻取了40.92m沉积柱,其14C年代有10个控制点,底部年龄最大值为14.5calkaBP,沉积柱为末次冰消期以来的湖泊沉积物。在沉积柱中按20cm/70a分辨率选出200个样品进行了黏土矿物、粒度、碳酸盐、沉积速率等非生物指标与生物指标的孢粉等多项指标的综合分析。结果表明:末次冰消期以来,达连海沉积柱中非生物指标与生物指标反映的气候和环境变化阶段的显著性不同,反映的气候环境的变化阶段也不尽一致,出现气候环境的相位差。冰消期黏土矿物非生物指标与孢粉生物指标有约1.0~1.2ka的相位差;早、中全新世黏土矿物反映的气候变化时段较孢粉指标指示的时段滞后约1.0ka;在晚全新世黏土矿物反映的气候变化较孢粉滞后约0.1ka。造成黏土矿物和孢粉反映气候环境相位差的原因是孢粉和黏土矿物对气候响应的差异性、黏土矿物和孢粉搬运方式的不同、气候条件及其转换、地貌等多因素的综合影响。

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