云南大理州洱源盆地温泉分布特征及成因分析

Study on Distribution Characteristics and Cause Analysis of the Eryuan Basin Geothermal Area

对洱源盆地及周缘温泉的分布及其成因进行了初步研究,研究表明:洱源牛街—三营区及洱源—炼城区地热水水化学类型以HCO3·SO4—Na·Ca型水为主,中性,含氡;下山口—西湖温水村区内地热水为弱碱性,富含偏硅酸、锶、锂、偏硼酸、钙等多种元素。大气降水、浅表岩溶水、基岩裂隙水及深部循环地下水为各温泉井的补给来源,断裂破碎带为地下热水、浅层地下水及地表水提供了良好的循环交换通道。热源主要由岩浆余热扩散、放射性元素蜕变热(氡是放射性元素铀、镭等衰变的结果)、正常地热增温及断裂活动摩擦生热等热源来源。

According to previous research,combined with field surveys,sampling and analysis,the authors preliminarily analyze the distributions and causes of the hot springs .Geothermal water chemistry type of the Eryuan Niujie-Sanying、Eryuan-Liancheng hot springs strip districts is HCO 3 · SO4—Na· Ca containing radon .The Geothermal water chemistry type of Xiashankou-Xihu geothermal hot springs strip district is alkalescent ,rich in silicic acid,strontium,lithium,borate, calcium and other elements .Atmospheric precipitation ,superficial karst water ,bedrock fracture water and deep groundwa-ter are the recharge sources of the hot springs ,Fracture zone provides a good circulation exchange channel between the underground water ,shallow groundwater and surface water .The heat source of hot springs include magma heat diffusion , radioactive decay heat ,normal geothermal warming and faulting friction heat .