Guanzhong Basin Underground Hot Water Circulation Patterns And To Update The Study

Using environmental isotopes and water chemistry, built environmental effect model of precipitation , hydrogeology model of the thermal water and math-physical model of environmental isotope tritium. We analyzed the recharge mechanism and recycling type of the thermal water system in GuanZhong basin. The dissertation supplys a science basis for reasonable exploitation and use of the thermal water .The results are as follows:1. Precipitation is the origin of all the water and the origin has no sea-water, magma water and sediment water by now.2. There are two systems in Guanzhong basin, karst thermal water system on the north of Wei river faults and large deep faults thermal water system on the south of Wei river faults. There are two inferior water system on the south of Wei river faults,one is "net thermal water" inferior system,the other is mixing water inferior system .3. Xianyang and Xi'an area is the geothermal origin, the origin of "net thermal water" is ice and snow water in Qingling Mountain above 1839m.Wei north thermal water is recharged by precipitationin from North Mountain exposed karst area. The thermal water on the Wei river faults and north Wei river faults recharges the center water in the basin. Shallow cold water recharges deep thermal water.4. The precipitation from Qingling Mountain and north Mountain flow deep through the large deep faults ,and heats up by geothermal , the water density becoming small and emerging .Forming zonary thermal reservoir in brink of the basin,and forming layer thermal reservoir when flows in level.5. Except the "net thermal water" in Xi'an and Xianyang ,the thermal water has mixed with cold water through channel faults.6. According to the chemical temperature level ,the thermal water's temperature range of the main reservoir is 50～119℃ 。7. According to the result of environment tritium math-physical model and carbon-14 age dating, think the renew ability of the thermal water in study area is confined and inhomogeneity. The thermal water in brink of the basin has certain renewal ability, but the renwal of the "net thermal water" in the center of the basin is not renew on the whole.