Geochemical Characteristics and Origin of Nuanquanzi Geothermal Water in Yudaokou,Chengde,Hebei,North China  

作　　者：Houyun Sun Xiaoming Sun Xiaofeng Wei Xingkai Huang Guoqiu Ke Hao Wei 

机构地区：[1]School of Water Resources&Environment,China University of Geosciences,Beijing 100083,China [2]Beijing Institute of Geology for Mineral Resources Co.,Ltd.,Beijing 100012,China [3]China Institute of Geo-Environment Monitoring,Beijing 100081,China [4]Zhongse Jietai Geophysical Science Co.,Ltd.,Beijing 100012,China [5]Hebei Center for Ecological and Environmental Geology Research,Hebei GEO University,Shijiazhuang 050031,China

出　　处：《Journal of Earth Science》2023年第3期838-856,共19页地球科学学刊（英文版）

基　　金：financially supported by the China Geological Survey(Nos.DD20190822 and DD20190536);the Key Research Program of Hebei Science and Technology Department(No.19224205D)。

摘　　要：Study on the Nuanquanzi geothermal field in the Yanshan uplift is of great significance for understanding the origin of geothermal fluid in the intracontinental orogenic belt of the fault depression basin margin in North China.The geochemical characteristics and formation mechanism of the Nuanquanzi geothermal system were elucidated by classical hydrogeochemical analysis,multi-isotopes approach(δD,δ^(18)O,δ^(13)C,δ^(87)Sr/^(86)Sr),14CAMSdating,and integrated geophysical prospecting of surface-soil radon gas measurement and CSAMT inversion.The results show that the Nuanquanzi geothermal field is a medium-low temperature convection-fault semi-enclosed geothermal system.The hydrochemical type of thermal water is primarily HCO_(3)-Na,and rich in soluble SiO_(2),F^(-)and Cl^(-).The geothermal water primarily originated from the recharging meteoric water with a maximum circulation depth of 2400-3200 m,but affected by the mixing of endogenous sedimentary water.The reservoir temperature calculated by Na-K and quartz geothermometer of the Nuanquanzi geothermal system was determined to be 73.39-92.87℃.The conduction-cooling and shallow cold-water mixing processes occurred during the parent geothermal fluid ascent to surface,and the proportion of cold-water mixing during circulation was approximately 88.3%to 92.2%.The high-anomaly radon zones matched well to the low apparentresistance areas and hiding faults,indicating that the Nuanquanzi geothermal field was dominated by a graben basin restricted by multiple faults.

关 键 词：geothermal water HYDROGEOCHEMISTRY water isotopes soil radon measurement controlled source audio-frequency magnetotelluric 

分 类 号：P314.1[天文地球—固体地球物理学]