2020年新疆伽师M_(S)6.4地震前后伽师地区温泉水文地球化学特征  

Hydrogeochemical Features of the Hot Spring Water before and after the 2020,Jiashi,Xinjiang M_(S)6.4 Earthquake

作　　者：颜玉聪 周晓成[1] 朱成英[2] 李静超 刘峰立 欧阳澍培 姜莉 YAN Yucong;ZHOU Xiaocheng;ZHU Chengying;LI Jingchao;LIU Fengli;OUYANG Shupei;JIANG Li(Key Laboratory of Earthquake Prediction,Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China;Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China;School of the Earth Science and Resources,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]中国地震局地震预测研究所地震预测重点实验室,北京100036 [2]新疆维吾尔自治区地震局,新疆乌鲁木齐830011 [3]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《地震研究》2022年第2期229-240,共12页Journal of Seismological Research

基　　金：地震科技星火计划项目(XH20066);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);中国地震局地震预测研究所基本科研业务费(2018IEF010104、2020IEF0604、2021IEF0602、2021IEF0101)联合资助。

摘　　要：对2018—2019年新疆伽师地区9个温泉的主量元素、微量元素、氢氧同位素、Sr同位素含量以及SiO_(2)含量进行了采样测试,并于2019年9月—2020年7月对其中2个温泉的水化学变化进行监测,分析2020年新疆伽师M_(S)6.4地震前后研究区温泉水化学组分和同位素组成的变化。结果表明:①研究区温泉可以划分为9种水化学类型,主要受蒸发盐岩的溶解作用控制,其次是碳酸盐岩及硅酸盐岩风化溶解作用;②氢氧同位素测试表明温泉水主要来源于周围6 km高山的冰川融水与大气降水,水-岩化学反应平衡特征表明乌恰泥火山、因干、塔合曼和阿合其温泉循环深度较深,水-岩反应程度高,而其它温泉的循环深度较浅,存在浅部冷水混入;③利用温标法估算该地区温泉的热储温度为17℃~82℃,循环深度约为0.6~3.2 km;④因干温泉及塔合曼温泉的常量及微量元素浓度在伽师M_(S)6.4地震前9~19 d有明显的异常,其异常幅度达到平均值的15%左右。We sampled and tested the contents including major elements,micro-elements,hydrogen and oxygen isotopes,strontium isotope,and silicon oxide in 9 hot springs in Jiashi,Xinjiang Uygur Autonomous Region in the period 2018-2019.And we continuously monitored the hydrochemical change of the two of the hot springs in the period from September,2019 to July,2020,in order to analyze the variation of the chemical composition and isotope composition in the hot springs before the 2020,Jiashi,Xinjiang M_(S)6.4 earthquake.We found that:(1)The water samples,which are mainly controlled by the dissolution of evaporative salt rocks,and by the weathering and dissolution of carbonate and silicate rocks,could be classified into 9 chemical types.(2)The hydrogen and oxygen isotope indicated that the hot spring water was originated from the meteoric water and the meltwater in the surrounding mountains within 6 km.The equilibrium features of the water-rock chemical reaction indicated that the circulation depth of Wuqia mud volcano,Yingan hot spring,Taheman hot spring and Aheqi hot spring were deep and with high degree of water-rock reaction.The circulation depth of other hot springs was shallow and mixed with cold water.(3)By the geothermal temperature scale method,the thermal storage temperature in this region is estimated as 17℃to 82℃,and the circulation depth ranged from 0.6 km to 3.2 km.(4)The concentrations of major-and trace-elements in Yingan hot spring and Taheman hot spring became significantly anomalous 19 days to 9 days before the Jiashi M_(S)6.4 earthquake,and the anomalous amplitude went 5%beyond the average.

关 键 词：水文地球化学 温泉 前兆异常 伽师M_(S)6.4地震 

分 类 号：P315.724[天文地球—地震学]