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中国西风区伊犁盆地塔勒德黄土-古土壤元素地球化学特征及环境意义

Keywords: 塔勒德,黄土-古土壤序列,元素地球化学,环境演变

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Abstract:

通过对新疆伊犁盆地塔勒德探井黄土-古土壤沉积物中常量、微量元素及其相关指标和参数的分析,讨论了西风区黄土-古土壤序列中各元素的分异规律及其与沉积环境之间的关系。结果表明塔勒德黄土-古土壤序列各层位中常量元素含量均表现出SiO2>Al2O3>CaO>Fe2O3>MgO>Na2O>K2O的变化特征;微量元素Rb,Sr,Sc,Ni,Cu,Ga,Mo,Y,Pb和Th在(弱)古土壤层、黄土层中相对下伏黄土L2层富集,而Zr,Cs,Nd和La在(弱)古土壤层中有不同程度的亏损。塔勒德黄土-古土壤的相关地球化学参数在整个研究地层序列中,黄土与古土壤之间分异并不显著,地球化学特征反映了受西风区影响的伊犁盆地黄土和古土壤形成时期其有效湿度较黄土高原同期小,形成环境更为干旱,具有其显著的区域特征。伊犁盆地黄土剖面元素地球化学特征主要受物质来源和气候环境的控制,当黄土物质具有相同来源时,其元素地球化学特征可以作为区域气候环境变化的良好代用指标。

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