Metallogenic correlation of special salt lake and hydrotherm, Qinghai-Tibet Plateau, China
LUO Yangbing;ZHENG Mianping;REN Yaqiong;MLR Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral Resources,CAGS;
The Qinghai-Tibet plateau special salt lakes are formed in the collision zone between two continental plates. The deep molten material of the Qinghai-Tibet plateau, since the tertiary formation and quaternary period, enjoys its unique composition(B, Li, Cs, As, K)diffused to upper crust surface in the form of hot water. The salt lakes in the Huan'ang area contain the highest contents of B, K, Cs, Rb in the Qinghai-Tibet plateau. Zheng et al. for the first time found the Miocene volcanic sedimentary dual structure, with the volcanic and hydrothermal activities as the main source of the Qinghai-Tibet plateau special components in the salt lake. The hot water in the QinghaiTibet plateau is widely distributed, the tropical geothermal water from south to north is divided into five kinds. The hot water in the tropical Shiquan river-Brahmaputra and the tropical Bangonghu-Nujiang and Guide-south Qilian, is rich in B, Li, Cs, Rb, and As. The salt lakes distributed surrounding these three tropical regions are also rich in these elements. The contents of Li, Cs, Rb, As and U elements, the chemical characteristics of the lake and ground water, the Rb/Cs and Ni/Co coefficients and the isotopic values in special salt lakes are different from those in the general salt lake and sea water, but are the same as those of the geothermal water in this area. At the same time,the water chemical characteristics of special salt lake and hot waters have a good corresponding relation. All water supplies of the QinghaiTibet plateau salt lake and hot water contain the highest level of Li, B, K, Rb and Cs elements. In conclusion, the Qinghai-Tibet Plateau special salt lakes are rich in Li, K and B elements and have a high correlation with the geothermal water.