摘要
2010—2021年对大凉山断裂带10个温泉开展采样,测定了15个水样中的常量元素和氢氧同位素,进行温泉水文地球化学特征研究,建立了温泉水文地球化学循环模型。研究结果表明:(1)δD、δ^(18)O的测量值分别为-86.8%~-100.54%和-11.7%~-13.7%,分布于大气降水线附近,表明大凉山断裂带温泉水主要为大气降水补给,其补给高程为2.1~2.5 km;(2)温泉水化学类型主要有HCO_(3)-Ca·Mg、SO_(4)·HCO_(3)-Ca·Mg、HCO_(3)-Ca、HCO_(3)-Na·Ca、HCO_(3)-Na和SO_(4)·HCO_(3)-Ca;(3)主量元素来自碳酸盐矿物和硅酸盐矿物的水-岩反应;(4)Na-K-Mg三角图表明该区温泉水样均为未成熟水;(5)运用硅-焓模型图解法得到该区热储温度为105.9℃~203℃,冷水混入比例约为68%~86%,其循环深度为1.9~3.9 km;(6)循环深度越深,地震活动性越强。
The major elements,trace elements,and stable isotopes of 15 water samples collected from 10 thermal springs in the Daliangshan Fault Zone from 2010 to 2021 are measured to study the hydrogeochemical characteristics,and a model of hydrogeochemical migration of the hot springs in the Daliangshan Fault Zone is built.The results show that:(1)The values of the stable isotopes(δD and δ^(18)O)are-86.8%—-100.54% and-11.7%—-13.7%,respectively,distributing near the atmospheric precipitation line;this indicates that the hot-spring water are recharged by the meteoric water at the elevations ranging from 2.1 km to 2.5 km.(2)From the north to the south of the Fault Zone,the chemical types of the hot-spring water are HCO_(3)-Ca·Mg,SO_(4)·HCO_(3)-Ca·Mg,HCO_(3)-Ca,HCO_(3)-Na·Ca,HCO_(3)-Na,and SO_(4)·HCO_(3)-Ca.(3)The major elements come from the water-rock reaction of carbonate minerals and silicate minerals.(4)The Na-K-Mg triangle diagram shows that the hot spring samples belong to “immature water”.(5)The silicon-enthalpy model is used and the geothermal reservoir temperature in this area is estimated to be between 105.9 ℃—203 ℃,the mixing ratio of the cold water is 68%—86%,and the circulation depth is 1.9 km—3.9 km.(6)The deeper the circulation of the hot-spring water is,the stronger the seismicity in the area will be.
作者
赵德杨
周晓成
何苗
天娇
李静超
董金元
颜玉聪
欧阳澍培
刘峰立
姚炳宇
王昱文
曾召君
陈曲菲
张晓明
杨耀
罗志鑫
ZHAO Deyang;ZHOU Xiaocheng;HE Miao;TIAN Jiao;LI Jingchao;DONG Jinyuan;YAN Yucong;OUYANG Shupei;LIU Fengli;YAO Bingyu;WANG Yuwen;ZENG Zhaojun;CHEN Qufei;ZHANG Xiaoming;YANG Yao;LUO Zhixin(Sichuan Earthquake Agency,Chengdu 610041,Sichuan,China;United Laboratory of High-Pressure Physics and Earthquake Science,Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China;Economic and Technological Development Zone Brigade,Fire and Rescue Detachment of Urumqi,Fire and Rescue Department of Xinjiang Uygur Autonomous Pegion,Urumqi 830009,Xinjiang,China)
出处
《地震研究》
CSCD
北大核心
2023年第1期26-36,共11页
Journal of Seismological Research
基金
中国地震局地震预测研究所基本科研业务费(CEAIEF20220507,CEAIEF2022030205,CEAIEF20220213,2021IEF0101,2021IEF0201,2021IEF1201)
国家重点研发计划(2017YFC1500501,2019YFC1509203)
国家自然科学基金面上项目(41673106,42073063,4193000170)
四川省地震局科技专项(LY2214)
四川省自然科学基金(2022NSFSC0210)联合资助。
关键词
大凉山断裂带
温泉
水文地球化学
循环模型
the Daliangshan Fault Zone
hot spring
hydrogeochemistry
circulation model
