萨拉乌苏河流域末次间冰期 古土壤化学风化与古气候
收稿日期: 2006-05-28
修回日期: 2007-02-20
网络出版日期: 2007-05-25
基金资助
国家重点基础研究发展计划(973 计划) (2004CB720206); 国家自然科学基金(49971009); 中国科学院知识创 新工程重要方向(KZCX2-SW-118)
Chemical Weather ing of the Milanggouwan Paleosols in the Salawusu River Valley and Their Paleoclimatic Implication during the Last Interglacial Period
Received date: 2006-05-28
Revised date: 2007-02-20
Online published: 2007-05-25
Supported by
National Basic Research Program of China, No. 2004CB720206; National Natural Science Foundation of China, No.49971009; Knowledge Innovation Program of CAS, No.KZCX2-SW-118
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。
欧阳椿陶, 李保生, 欧先交, 温小浩, 曾兰华, 杨艺, 刘宇飞 . 萨拉乌苏河流域末次间冰期 古土壤化学风化与古气候[J]. 地理学报, 2007 , 62(5) : 518 -528 . DOI: 10.11821/xb200705008
There are five layers of paleosols in Milanggouwan section in Salawusu River valley of Inner Mongolia during the last interglacial period. We have observed the morphological features of these paleosols and analyzed their grain-size, surface textural features and chemical weathering. The results showed that: (1) These paleosols have some morphological features just like the recent cinnamon soils in North China. (2) They are similar to the recent cinnamon soils that have higher clay contents in the middle part than in the other parts of the soil and SiO2 solution and precipitation can be observed on the surface of the quartz grain, indicating that chemical weathering and pedogenic process have taken place. (3) On the basis of CaO/MgO, K2O/Na2O, Al2O3/Na2O, MnO/Al2O3, CIA and A-CN-K diagram, the comparison results show that the intensity of chemical weathering in paleosols is very similar to the recent cinnamon soils in North China. (4) Using the regression equation of CIA, the values of annual temperature and precipitation of those paleosols can be calculated respectively, and with those values, it is easy to ascertain that the climate conditions are similar to that of North China.
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