川西巴塘地区富锂温泉的同位素特征及其成因探讨  

Isotope characteristics of lithium-rich hot springs and its genesis in Batang area of western Sichuan

作　　者：胡志华[1] 田建吉[2] 吕菲 刘畅 雷鸣宇 万汉平[1] 郝伟林[1] 张松[1] 高洪雷[1] 吴儒杰[1] HU Zhihua;TIAN Jianji;LYU Fei;LIU Chang;LEI Mingyu;WAN Hanping;HAO Weilin;ZHANG Song;GAO Honglei;WU Rujie(CNNC Geothermal Exploration Technology Center Beijing Research Institute of Uranium Geology,Beijing 100029,China;CNNC Key Laboratory of Uranium Resource Exploration and Evaluation Technology Beijing Research Institute of Uranium Geology,Beijing 100029,China;Sichuan Xizang Railway Technology Innovation Center Co.,Ltd.,Chengdu 610200,China)

机构地区：[1]核工业北京地质研究院中核集团地热勘查技术研究中心,北京100029 [2]核工业北京地质研究院中核集团铀资源勘查重点实验室,北京100029 [3]川藏铁路技术创新中心有限公司,四川成都610200

出　　处：《世界核地质科学》2024年第1期88-104,共17页World Nuclear Geoscience

基　　金：中核集团铀矿地质项目(编号:地GT2201);核工业北京地质研究院院长青年科技创新基金项目(编号:热QJ2108)。

摘　　要：川西巴塘地区处于青藏高原东南缘,是地壳新构造运动活跃、地震活动强烈而密集的地区,其中茶洛—德达地段是温泉聚集区,富锂沸泉与温泉密集发育。为进一步认识该区富锂温泉的成因以及温泉与地震活动的关系,开展了温泉水氢、氧、碳和锂同位素的综合研究,阐明了地热流体、锂和热量的来源,探讨了富锂温泉的成因及其与地震活动的关系,为该区富锂温泉的研究和勘查提供支撑。研究结果显示:1)茶洛—德达地段发育章柯、茶洛富锂沸泉和查青卡富锂温泉,锂含量高达1353.00~3592.00µg·L^(-1),其锂同位素组成δ7Li介于-0.53‰~1.74‰之间;2)该区富锂温泉水主要来源于周边4800~5200 m的高山区域大气降水,温泉流体循环深度可达6900~8500 m,与该区部分地震的震源深度相当;3)富锂温泉的深部发生较强的高温(温度236~289℃)水-岩反应,碳酸盐岩、富锂花岗岩等释放出碳和锂等元素,形成查青卡富锂温泉(1353~1392µg·L^(-1));章柯、茶洛沸泉除上述锂来源外,还有深部高温富锂流体混入,从而形成更高温(240~289℃)、更富锂(2736~3592µg·L^(-1))的地热流体;4)该区章柯、茶洛富锂沸泉的热源除以深部(地壳、地幔)热流为主要热源外,还有地震断层摩擦热、深部流体热为补充热源,频发的地震活动持续地、脉动式地为章柯、茶洛地热系统补充热量,形成富锂沸泉。查青卡富锂温泉热源主要为深部(地壳、地幔)热流,无断层摩擦热和深部流体热补充。Batang area in western Sichuan is located at the southeastern edge of the Qinghai Tibet plateau,and is an area with active crustal neotectonic movement and strong and dense seismic activity.Among them,Chaluo-Deda area is a hot spring gathering area,with lithium rich boiling springs and hot springs densely developed.In order to further understand the origin of lithium rich hot springs in the area and the relationship between hot springs and seismic activity,a comprehensive study of hydrogen,oxygen,carbon,and lithium isotopes in hot spring water was carried out in this paper,the sources of geothermal fluids,lithium,and heat were elucidated,the origin of lithium rich hot springs and their relationship with seismic activity was explored,which provided support for the research and exploration of lithium rich hot springs in the area.The research results show that:1)Zhangke,Chaluo lithium rich boiling springs,and Chaqingka lithium rich hot springs are developed in the Chaluo-Deda area,with lithium content as high as 1353~3592µg·L^(-1),its lithium isotope compositionδ7Li ranges from-0.53‰to 1.74‰;2)The lithium rich hot spring water in this area is mainly sourced from atmospheric precipitation in the surrounding mountainous area at level of 4800~5200 meters.The fluid circulation depth of the hot spring can reach 6900~8500 meters,which is equivalent to the focal depth of some earthquakes in this area;3)The deep part of the lithium rich hot spring experiences strong high-temperature(temperature 236~289℃)water rock reactions,and carbonate rocks,lithium rich granite,release elements such as carbon and lithium,forming the Chaqingka lithium rich hot spring(1353~1392µg·L^(-1));In addition to the lithium sources mentioned above,Zhangke and Chaluo boiling springs also have deep high-temperature lithium rich fluids mixed in,resulting in higher temperatures(240~289℃)and richer lithium(2736~3592µg·L^(-1))of geothermal fluid;4)The heat source of the Zhangke and Chaluo lithium rich boiling springs in this area is mainly

关 键 词：富锂温泉 同位素 地震活动 成因 川西巴塘地区 

分 类 号：P618.71[天文地球—矿床学] P314[天文地球—地质学]