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OALib Journal期刊
ISSN: 2333-9721
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萨拉乌苏河流域末次间冰期古土壤化学风化与古气候
DOI: 10.11821/xb200705008, PP. 518-528
Keywords: 萨拉乌苏河,古土壤,化学风化,末次间冰期,古气候
Abstract:
内蒙萨拉乌苏河流域米浪沟湾剖面末次间冰期发育5层古土壤。对这5层古土壤的形态特征、粒度、扫描电镜及化学风化等分析结果表明(1)这些古土壤具有与华北现代褐土相似的形态特征;(2)粘化率中部高和石英颗粒表面硅质溶蚀—沉淀现象表明古土壤层中发生过风化成壤作用;(3)用K2O/Na2O、Al2O3/Na2O、MnO/Al2O3、CIA及A-CN-K图解与华北现代褐土作对比分析,发现它们的化学风化特征极为相似;(4)用气温及降水量与CIA值的回归关系方程,得出5层古土壤发育时期的水热状况确与华北现代的暖温带半湿润季风性气候大致相同或更显暖湿。形态特征、粒度、石英颗粒表面特征和化学风化特征等多个方面具备了与现代华北褐土类似的化学风化成壤特征,证明这些古土壤是在与华北相似的暖温带半湿润季风性气候条件下形成的。
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