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选取云南石林红土剖面作为研究对象,探讨在岩溶盆地这一独特地貌单元中主量、稀土元素的地球化学特征。研究表明:①云南石林土壤中主量和稀土元素的组成具有较好的一致性;②通过对化学蚀变指数(CIA)与Na/K比值关系图以及A-CN-K(Al_2O_3-CaO*+Na_2O-K_2O)三角图分析发现:石林地区2个剖面均经历了温暖湿润环境下的强烈化学风化作用;石林地区土壤中稀土元素含量较高,其稀土元素球粒陨石标准化分布模式表现出高度相似性,且继承了基岩的特征,两者均表现为Eu处负异常,但剖面CK在Ce处表现为负异常,而剖面KP在Ce处无明显变化;③2个剖面元素组成及含量变化基本保持一致,表明此地土壤受外来物质影响程度较小,2个剖面的元素地球化学特征与基岩存在一定相似性。
The authors selected the Shilin clay profile of Yunnan Province as the research object and discussed the geochemical characteristics of the main and rare earth elements in this unique geomorphic unit in the karst basin. The results show that: (1) The composition of main amount and REE in Shilin soil have good consistency; (2) Through the relationship between chemical alteration index (CIA) and Na / K ratio and A-CN-K + Na_2O-K_2O) triangle diagram shows that both sections of Shilin area experienced strong chemical weathering under warm and humid environment; the content of rare earth elements in the soil of Shilin area is higher, and the normalized distribution pattern of the rare earth element chondrules shows height Similarity, and inherited the characteristics of bedrock. Both of them show negative anomaly at Eu, but the section CK shows a negative anomaly at Ce, while the section KP has no obvious change at Ce. ③ The composition and content change of the two sections Basically consistent, indicating that the soil is less affected by foreign material, the two sections of the element geochemical characteristics and the bedrock there is a certain similarity.