摘要
为查明冀东北地区中低温对流型地热系统中氟的富集过程,通过对地热流体水化学特征和同位素数据的分析,研究地热流体中氟的分布特征、富集规律、水化学过程及影响因素。结果表明:研究区地热流体F^-含量为1.36~23.83 mg/L,呈现北高南低的趋势;在HCO3^-—Na^+和SO4^2-·HCO3^-—Na^+等Na型水中富集程度高于HCO3^-—Ca^2+和HCO3^-—Ca^2+·Mg^2+等Ca型水;碱性环境、温度和循环深度是影响氟离子富集的主要因素;水岩作用、含氟矿物溶解及阳离子交换作用,是控制高氟地热水水化学特征的主要地球化学过程。氟浓度异常可为寻找地热资源提供基础参考线索,为地热资源的科学合理利用提供科学依据。
Objectives:In order to find out the enrichment process of fluorine in the mid—low temperature convective geothermal system in northeastern Hebei Province,the distribution characteristics,enrichment law,hydrochemical process and influencing factors of fluorine in the geothermal fluid were studied.Methods:Through the analysis of geothermal fluid water chemistry characteristics and isotopic value.Results:The results show that the F^- content of the geothermal fluid in the study area is between 1.36~23.83 mg/L,showing a trend of higher in the north and lower in the south;the concentration of Na-type water such as HCO3^-—Na^+ and SO4^2-·HCO3^-—Na^+ is higher than that of HCO3^-—Ca^2+ and HCO3^-—Ca^2+·Mg^2+ and other Ca-type water;alkaline environment,temperature and circulation depth are the main factors that affect the enrichment of fluoride.Conclusions:Water—rock interaction,dissolution of fluorine-containing minerals,and cation exchange are the main geochemical processes that control the hydrochemical characteristics of high-fluorine geothermal water.Abnormal fluorine concentration can provide basic reference clues for finding geothermal resources,and provide scientific basis for the scientific and rational utilization of geothermal resources.
作者
原若溪
王贵玲
刘峰
张薇
曹胜伟
YUAN Ruoxi;WANG Guiling;LIU Feng;ZHANG Wei;CAO Shengwei(The Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang,050061;Technology Innovation Center of Geothermal&Hot Dry Rock Exploration and Development,Ministry of Natural Resources,Shijiazhuang,050061)
出处
《地质论评》
CAS
CSCD
北大核心
2021年第1期218-230,共13页
Geological Review
基金
中国地质调查局项目(编号:DD20189112,DD20160190)的成果。
关键词
氟
中低温对流型地热系统
冀东北地区
河北省
水文地球化学
fluorine
low—medium temperature convection geothermal system
Northeastern Hebei Province
hydrogeochemistry
作者简介
原若溪,女,1992年生,硕士,主要从事地热水化学及资源评价方面的研究,Email:234408031@qq.com;通讯作者:王贵玲,男,1964年生,研究员,主要从事地热地质学等研究,Email:guilingw@163.com。
