Isotope characteristics of lithium-rich hot springs and its genesis in Batang area of western Sichuan
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 1 353～3 592 µg·L-1,its lithium isotope composition δ 7Li 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 4 800～5 200 meters.The fluid circulation depth of the hot spring can reach 6 900～8 500 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(1 353～1 392 µg·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(2 736～3 592 µg·L-1)of geothermal fluid;4)The heat source of the Zhangke and Chaluo lithium rich boiling springs in this area is mainly divided by deep(crust,mantle)heat flow,as well as seismic fault friction heat and deep fluid heat as supplementary heat sources.Frequent seismic activities continuously and pulsatively supplement heat to Zhangke and Chaluo geothermal systems,forming lithium rich boiling springs.The main heat source of Chaqingka lithium rich hot spring is deep(crust,mantle)heat flow,without fault friction heat and deep fluid heat supplementation.
lithium rich hot springsisotopesseismic activitycause of formationBatang area of western Sichuan
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