Carbonate in lake sediments has an indicative significance for climate and environment. In this paper, the carbonate contents were semi-quantitatively analyzed by meaning of chemical analysis(gasometric method) and X-ray diffraction(XRD method), which were from the sediments of the core KS-2006 of Lake Kusai in Hoh Xil region, Qinghai-Tibetan Plateau. The results showed that there were at least nine kinds of minerals in the core KS-2006, and the measurement error of XRD method(5%) was higher than that of gasometric method(0.8%). However, the XRD method obtained the average value(18.9%) and variation range(7%39%) of the total carbonate contents from the sediments of the core KS-2006, which was basically identical with the average value(19.4%) and variation range(5.0%30.7%) comparing with both of the result. Meanwhile, it showed a positive correlation between the XRD method and gasometric method, and fluctuation tendency with the depth was uniform. This indicated that the XRD method was a reliable method which can be well used to semi-quantitatively analyze the kinds of carbonate minerals and determine their content in lake sediments.
1.中国科学院青海盐湖研究所, 中国科学院盐湖资源与化学重点实验室, 西宁, 青海 810008, 中国 2.首都师范大学资源环境与旅游学院, 北京 100048, 中国 3.Alfred Wegener Institute for Polar and Marine Research, Research Unit Potsdam, Potsdam, Brandenburg 14473, Germany