地理科学 ›› 2017, Vol. 37 ›› Issue (6): 944-951.doi: 10.13249/j.cnki.sgs.2017.06.017

• 研究论文 • 上一篇    下一篇

岩溶盆地红土风化剖面的元素地球化学研究

张晓娟1(), 季宏兵2(), 冯晓静1, 温月花1, 张涛1, 熊凯1   

  1. 1.首都师范大学资源环境与旅游学院,北京 100048
    2.北京科技大学土木与环境工程学院,北京 100083
  • 收稿日期:2016-07-25 修回日期:2016-12-15 出版日期:2017-06-20 发布日期:2017-06-20
  • 作者简介:

    作者简介:张晓娟(1990-),女,山西阳泉人,硕士,研究方向为环境地球化学。E-mail: zhangxiaojuan_cnu@163.com

  • 基金资助:
    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

Element Geochemistry Characteristic of the Red Soil Weathering Profiles in the Karst Basin

Xiaojuan Zhang1(), Hongbing Ji2(), Xiaojing Feng1, Yuehua Wen1, Tao Zhang1, Kai Xiong1   

  1. 1.College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China
    2.College of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2016-07-25 Revised:2016-12-15 Online:2017-06-20 Published:2017-06-20
  • Supported by:
    National Natural Science Foundation of China(41473122,41073096), National Key Research Projects (2013CB956702), Chinese Academy of Sciences "Hundred Talents" Project

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: 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; 通过对化学蚀变指数(CIA)与Na/K比值关系图以及A-CN-K(Al2O3-CaO*+Na2O-K2O)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;2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。

关键词: 岩溶盆地, 红土, 元素地球化学

Abstract:

Shilin is located in the east of Yunnan Province, where the red soil is widely distributed. The carbonate weathering profiles in Shilin are selected as the main studying objects. The study on the geochemical behaviors of the major elements and rare earth elements(REE)in the unique terrain about the karst basin may provide a reference for elements geochemical behaviors in the weathering crust. The results indicate that the composition of the main elements in the weathering crust in Shilin have good consistency. According to the analysis of the relationship between the chemical index of alteration (CIA) and the Na/K ratio, and the A-CN-K ternary diagram (Al2O3-CaO*+Na2O-K2O), it shows that the two profiles in Shilin have both experienced strong chemical weathering under the warm and humid environment. There is a wide variation range and a higher content about the REE total composition in Shilin. The REE content in the profiles is higher than that in the bedrock. The REE distribution patterns of two profiles show a high similarity and inherit the characteristics from the bedrock. The chondrite-noamalized distribution patterns in two profiles both show slight negative Eu-anomalies. However, the profile CK shows a negative Ce-anormal, where the profile KP has no obvious changes. The change of the composition and content of the two profiles is consistent, which indicates that the soil is less affected by the other material. There are some similarities about the element characteristics between the weathering crust and the bedrock, which have an important meaning in the study of source characteristics and in-situ weathering.

Key words: Karst basin, red soil, element geochemistry

中图分类号: 

  • P595