A Study Of Hydrochemistry And Geyser Of Thermal Groundwater In The Banglazhang Geothermal Field In Longling, Yunnan

The Banglazhang hot springs are located in Longling country of Yunnan province. There are more than 600 vents of hot springs, include boiling springs, fumaroles, geyser, etc. The tufa is distributed widely in the hot spring area. The hot springs are emerged from the bedrock of metamorphic rocks, abided by the great Longling-Ruili fault of. Because of the Asia-Euro plate collided with India plate, the structure activity in the research area is strong. There are many volcano remains in the research area, and earthquakes occurred frequently. This research of Banglazhang hot springs is benefit for making sense of the complex structure activity, and be helpful for analysis the relationship between the hot water and the earthquakes, which will suppose the forecasting earthquakes.The research in this paper based on the hydrology conditions, geochemical methods and isotope method, are used to analyze the geochemical characteristics and the isotopic features, and to study the evolution mechanism of the Banglazhang hot spring and the formation mechanism of the geyser.The Banglazhang hot spring is belong to the Banglazhang-Huangcaoba geothermal abnormal area, in which the average temperature of the hot water is reached to 68.1℃, and the water temperature of Banglazhang hot spring is high reached to 98℃, which belong to the high temperature hot water. The total flow is 15 L/s, the chemical type is HCO₃-Na type, the total dissolved mass is 0.904g/L, which is lower TDS, pH is 9.15, which is alkaline water. The hydrogen and oxygen isotope is lined in the vicinity of the global meteoric water line (GMWL), no significant drift phenomenon. So the main sources of spring water are deprived from the precipitation. The elevator of recharge is 1879 m by calculating, the residence time is 78 a, the temperature of storage energy zone is between 190-220℃, the deep of recycle is 3.285 m. Banglazhang hot spring water is recharged from precipitation, heated by the high temperature in the storage energy zone, then discharge through the fracture zone. The recharge area of hot spring is in Gaoligongshan mountain area, the storage energy stratum is fracture zone, the hot spring is fault-deep circulation type.There is a geyser in the Banglazhang hot spring area, which is induced by earth quake, the geyser eruption height is 0.5 m, and the average interval time is 78 s, the eruption time is 48 s. Geyser has three features: hot resources, water box, and water recharge. The main features of geyser is intermittent eruption, the reason is energy and water gathered in water box, when the water fall upon the water box and the pressure of water in the box is higher than the atmospheric pressure, the eruption occurs. Through the modeling the activity of the geyser, the relationship between the activity of geyser and the hot resources, recharge of groundwater and scale of water box can be found.Banglazhang geyser is seldom seen in our country, so it worth to be explored in travel. Through the development of the geothermal resources, the economic develop of local country will get improvement, but the protection of the geothermal remains is necessary.