青海兰采温泉地质特征及成因分析

Geological characteristics and genetic analysis of Lancai hot spring in Tongren City of Qinghai

青海省兰采温泉是省内第二高温温泉,对于青海省生态文明建设,实现“双碳”指标具有重要意义。为了研究兰采温泉地质特征及成因,通过地热地质调查、同位素取样测试等方法对该地区地质、断裂构造、温泉水化学特征及成因机制进行研究。研究结果表明:兰采温泉主要受近NW向及近SN向断层构造控制,补给来源于异地高海拔地区,通过NW向断层或节理裂隙构造经深循环运移,被深部热源加热后,沿近SN向迪蒙—夏琼西逆冲断层上升,并于地势较低的隆乌古曲深切峡谷区出露成泉。研究成果对区域干热岩资源调查提供了有利勘查开发靶区,对青海省地热资源开发利用具有重要意义。

As the second-hottest spring in Qinghai Province,Lancai hot spring plays an important role in constructing ecological civilizations and achieving‘dual carbon’goals in Qinghai.In order to understand the geological characteristics and genesis of Lancai hot spring,this study investigates the geology,fault structure,and chemical characteristics and formation mechanism of hot spring water in the study area,through methods such as geothermal geological survey and isotope sampling test.The study result shows that Lancai Hot Spring is mainly controlled by nearly NW striking and NS striking faults.Its replenishment comes from remote high-altitude areas,and it migrates through deep circulation by the NW striking fault structures or joint fissures.After being heated by deep heat sources,it rises along the nearly SN Dimeng-Xiaqiong west reverse fault and emerges as a spring in the low-lying deep-cut canyon situated in Longwuguqu.This research provides a new favorable prospecting development target area for regional investigation of hot dry rock geothermal resources,which is of great significance to the development and utilization of geothermal resources in Qinghai Province.