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柴达木盆地察尔汗湖相沉积物的粒度分布模式及其环境意义

, PP. 212-220

Keywords: 湖相沉积物,粒度分布模式,环境意义,柴达木盆地,察尔汗

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Abstract:

对柴达木盆地察尔汗地区ISL1A孔的湖相沉积物样品进行了粒度分布特征分析,研究表明:(1)样品的粒度特征呈三峰模式,部分高盐阶段样品缺失第三峰,为双峰模式;(2)2~10μm部分以湖成组份为主;10~70μm和70~650μm部分以风成组份为主;(3)<2μm的组份可能与湖泊的生物化学成因有关。上述各组份与气候变化密切相关,且各自代表的环境意义也不同:<2μm和2~10μm部分反映了湖泊淡化-咸化程度和水量变化过程。10~70μm部分可能在一定程度上反映了东亚冬季风的强度;70~650μm部分反映了尘暴天气的程度。环境指标的对比分析很好地验证了ISL1A孔样品粒度各个组份划分的准确性,并可反演92.9ka以来该地区的古气候演化过程。

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