全南-寻乌断裂带温泉水文地球化学特征  

Hydrogeochemical Characteristics of the Hot Springs in the Quannan-Xunwu Fault Zone

作　　者：欧晓斌 鲍志诚 吕坚 肖健 赵影 陈浩 OU Xiaobin;BAO Zhicheng;LYU Jian;XIAO Jian;ZHAO Ying;CHEN Hao(Jiangxi Earthquake Agency,Nanchang 330026,Jiangxi,China;Observatory for Geodynamic of the East Yangtze Block in Jiujiang,Jiangxi Province,Jiujiang 332006,Jiangxi,China)

机构地区：[1]江西省地震局,江西南昌330026 [2]江西九江扬子块体东部地球动力学野外科学观测研究站,江西九江332006

出　　处：《地震研究》2023年第4期529-541,共13页Journal of Seismological Research

基　　金：江西九江扬子块体东部地球动力学野外科学观测研究站开发基金(OGYB202203,SDGD202215);中国地震局地震科技星火计划项目(XH20032).

摘　　要：对全南—寻乌断裂带上5个温泉点进行野外调查和取样分析,对采集的水样进行常量组分、微量元素和氢氧同位素的测试,得到该区断裂带上温泉的水文地球化学特征及其成因。结果表明:①全南—寻乌断裂带温泉水温为42℃~72℃,属中高温温泉;分为HCO_(3)-Na型水和HCO_(3)-Na-Ca型水,以HCO_(3)-Na型为主;富集Na、Li、Sr等主微量组分,主要是由于地下热水在循环过程中与周边的燕山期中酸性侵入岩发生了水-岩相互作用导致。②δD和δ^(18) O测值分别为-40.38‰~-44.50‰和-6.42‰~-6.95‰,分布在大气降水线左侧附近,指示热水主要源自大气降水,并且部分温泉与其中的CO_(2)气体发生了水-气相互作用。③温泉主要是由大气降水沿全南—寻乌断裂带深入地壳深部,经过深循环加热后,在有利的断裂通道上涌至地表而形成,温泉的空间分布和水文地球化学特征与该区的地震活动有着较好的对应关系。Through field investigation and sampling of the water in five hot springs in the Quannan-Xunwu fault zone,the major components,trace elements,and hydrogen and oxygen isotopes of the collected water samples are tested to find out the hydrogeochemical characteristics of the water in these five hot springs and its cause in this area.The results show that:①The temperature range of the hot springs in the Quannan-Xunwu fault zone is 42℃-72℃;these springs belong to medium-high temperature hot springs;the water in the hot springs belong to the HCO_(3)-Na type and the HCO_(3)-Na-Ca type,and the HCO_(3)-Na type water is the major part.The hot springs are rich in Na,Li,and Sr,due to the water-rock reaction between the underground hot water and the surrounding Yanshanian intermediate-acid intrusive rocks during the circulation process.②The range of δ^(18) O isotope values is-40.38‰~-44.50‰,and the range ofδD isotope values is-6.42‰~-6.95‰.These values are near the left side of the atmospheric precipitation line,indicating that the hot springs’water replenishment mainly comes from atmospheric precipitation,and some hot springs have water-gas interaction with CO_(2) gas therein.③In the Quannan-Xunwu fault zone,the atmospheric precipitation flows into the deep crust along the Quannan-Xunwu fault zone,then,after cycle heating in the deep,the water flows back onto the earth’s surface through the fracture channel and supplies the hot springs.In the Quannan-Xunwu fault zone,the spatial distribution and the hydrological characteristics of the hot springs have a good relationship with the earthquake activity.

关 键 词：温泉 水化学组分 氢氧同位素 全南—寻乌断裂带 

分 类 号：P315.724[天文地球—地震学]