Contrast of Geochemical Features of the Typical Weathered Profiles in Guizhou Plateau

详细信息   

• 责任者：Cao Wanjie (Key Laboratory of Metropolitan Eco-Environmental Processes ; College of Resource Environment and Tourism ; Capital Normal University ; Beijing 100048 ; China) ; Ji Hongbing
• 刊名：Carsologica Sinica
• 出版年：2012
• 卷期：31(2)
• 关键词：化学风化作用 ; chemical weathering ; 岩溶环境 ; karst environment ; 贵州 ; Guizhou Province
• 页码：p.131-138
• 图表：illus., 3 tables, 25 refs.
• 分类号：0100
• issnNo：ISSN1001-4810
• isbnNo：CN45-1157/P

摘要

Guizhou Plateau is located in the east of the Yunnan-Guizhou Plateau, where variable karst landscapes are widely distributed. Typical silicate weathered profile（Deng Jiawan profile） and carbonate weathered profile（Pingba profile） in the karst area are selected as the main studying objects. Based on the study on the element’s distribution and the chemical weathering intensity, it is found that： the content of SiO₂, Fe2O₃, Al2O₃ are the highest components at the two profiles, but the distribution of the major chemical components are significantly different, which is led by the difference in parent materials; there are significant differences between the values of the chemical index of alteration（CIA） at the two profiles, which illustrates that the stages of chemical weathering are different; and the formation of the profiles are due to the weathering of their own bedrock, but not influenced obviously by the loess in North China.