Isotope Geochemistry Characteristic Of Surface Water In Aba Kaschin-Beck Disease Areas

The Aba Autonomous Region, the rare endemic area of KBD, is located in the Northwest part of Sichuan Province. The cause of KBD is closely to related to the hydrometrical-setting in that distinguish. Finding out the features about water chemistry, and going into the source of the water can offer a scientific proof for setting down the immigrant and digging well. This paper is based on the"the cooperation project between the government of Sichuan province and Ministry of Land Resources"which the sub-name is"the survey of the ecological geochemistry in Aba Sichuan province(1212010913022)"ascertaining the characteristic of hydro geochemistry, and the oxyhydrogen isotope analysis combined with the factors on lithology, structure, hydrogeololgy, we discussed the different origin of different water, and its relationship.The main achievements as below:The analysis of water chemistry shows that the water in study place is mostly middle alkalinity and light mineralization, and the water chemistyr's type is HCO₃-Ca and HCO₃-Ca·Mg. The Duke rive has the highest mineralization among the all rives in search place. It maybe have some supply given by underground water. The mineralization of well water and the tap water are higher than the water from rives and brook. Dissolving of Carbonate and silicate helps to form the unique water chemistry. The key element in content of ion is layer lithology. And it also control the mineralization in wanter.Oxyhydrogen isotope feature analysis of water showed that the region water mainly derived from atmospheric precipitation ,followed by groundwater and snow melt water. Deuterium excess parameter showed that regional water is subject to certain evaporation. The sources of different river basin water in different, different river basin region water isotopesδD andδ¹⁸O of Ma erqu and A qu rive in Aba County is maximum of all region, showed that the source of the river supplied by highland lakes. TheδD andδ¹⁸O of middle and lower river in Duke river basin assume burden and mineralization high ,showing groundwater recharge. Compared with Zequ river,theδD andδ¹⁸O of white river in Hongyuan assume large, indicate characteristics of strong evaporation. Other rivers mainly supplied from atmospheric precipitation.