LIU Wen-jing1,2, TU Cheng-long1, LANG Yun-chao1 ,FENG Jia-yi1,2, LI Long-bo1,2, WANG Qi-lian1, LIU Cong-qiang1
(1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, CAS,Guiyang 550002, China;
2. Graduate University of Chinese Academy of Sciences, Beijing,100049, China)
Abstract：Typical yellow and limestone soil profiles in the karst areas of Southwest China, were studied for major and trace element contents, which provides the information about the crustal weathering and soil formation process. The soils studied showed that the contents of P and most Mn in the samples are higher than the average values of upper continental crust (UCC), while the contents of Na, K, Ca, Mg are lower. Compared with the yellow soil profiles, the limestone soil profiles have higher contents of K and Rb, but lower contents of Sr，higher Th/Ta and Rb/Sr ratios and CIA, which together present the difference in parent material and stronger weathering of the limestone soils. It is concluded that the same type of soils in different sampling areas and the different types of soils in one sampling area show significantly variations in major and trace element compositions, resulting from the different parent materials and soil formation processes and degrees of weathering in the different areas.
Key words: karst area; yellow soil profile; limestone soil profile; major element;, trace element; soil-formation process
EARTH AND ENVIRONMENT Vol. 38, No.3, Tot No.281, 2010, Page 271-279
