岩溶盆地红土风化剖面的元素地球化学研究

发布时间：2018-12-13 20:06

【摘要】：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。
[Abstract]:Taking the laterite section of Shilin Yunnan as the research object the geochemical characteristics of the main quantity and rare earth elements in this unique geomorphological unit of karst basin are discussed. The results showed that: (1) there was a good consistency between the main amount and the composition of rare earth elements in the soil of Yunnan stone forest; 2 by analyzing the ratio of chemical alteration index (CIA) to Na/K and A-CN-K (Al_2O_3-CaO* Na_2O-K_2O) triangulation, it is found that the two sections in Shilin area have experienced warm and humid conditions. Strong chemical weathering in environment; The REE content in soil is high in Shilin area. The standardized distribution pattern of REE chondrites shows high similarity and inherits the characteristics of bedrock. Both of them show negative anomalies in Eu, but CK in profile shows negative anomaly at Ce. However, there was no obvious change of profile KP in Ce. The variation of element composition and content in 32 sections is basically consistent, indicating that the soil in this area is less affected by foreign materials, and the geochemical characteristics of elements in two sections are similar to those of bedrock.
【作者单位】：首都师范大学资源环境与旅游学院;北京科技大学土木与环境工程学院;
【基金】：国家自然科学基金(41473122,41073096) 国家重点研究项目(2013CB956702) 中国科学院“百人计划”项目资助~~
【分类号】：P512.1;P595

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