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《GEOLOGY-GEOCHEMISTRY》 1998-02
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GEOCHEMICAL PHASES AND POLLUTION HISTORY OF HEAVY METALS IN SEDIMENTS OF LAKE ERHAI

Chen Jing'an; Wan Guojiang ;Huang Ronggui (State Key Lab. of Environmental Geochemistry, Institute of Geochemistry,Chinase Academy of Sciences, Guiyang, 550002)  
The enclosed or semi-enclosed plateau lake, whose sediment records can provide us with plenty of fine and high resolution information, is a sensitive indicator of climaic and environmental changes. During the reconstruction of various short-time-scale(for example, thousand, hundred or ten years) climatic and environmental changes, the geochemical in plateau-lake sediments are superior to other naural files, especially in indicating recent pollution history. Based on the geochemical phases of heavy metals such as Fe, Mn, CU, Ni, Pb and Ce in the sediments of Lake Erhai in the Yunnan-Guizhou Plateau, this paper, using factor analysis, identifies the main sources of heavy meals in the sediments and factors affecing their distributions including catchment erosion, air deposition, discharge of indusrial wasewater and domesic sewage, and diagenetic modification. At the are time, the 210Pb method is used to calculate sediment accumulation rates and develop chronological information in the sediment core. On the basis of factor analysis and dating, this paper evaluates the changing dominant sources of heavy metals and reveals the pollution history of heavy metals in the area. The following results and conclusions are drawn.1. Catchment erosion is a decisive facor affecting the distribution of heavy metals in lake sediments.2. Afer 1958, air pollution became serious in the me because of burning of fossil fuels (oil, coal and naural gasee) on a large scale.3. As a result of the consruction of the Xierhe Hydroelectric Station and the destruction of vegtation,catchment erosion has been becoming stronger since 1982, to which more attention should be paid.4. Lake sedimentation is a continuous accumulation process, so we should be prudent in determining the time of the strongest diagenetic modification.
【Fund】: 国家自然科学基金
【CateGory Index】: P59
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