高校地质学报2024，Vol.30Issue(6)：646-659,14.DOI:10.16108/j.issn1006-7493.2023073
西藏山南钙华与硅华大规模沉积型地热泉水化学演化对比研究
Mechanism Governing on Different Hydrochemical Evolution Processes for Two Types of Travertine and Silica Sinters in Shannan,Tibet
摘要
Abstract
The Tibet Plateau is rich in geothermal resources.Among them,in Chaka and Quzhuomu areas of Shannan,under similar background of geohistorical evolution,geothermal springs with significantly different water chemical compositions were formed,and two different types of springs,silica and travertine,were deposited on a large scale.In this paper,the causal mechanisms of the differences in hydrochemistry between the two types of geothermal systems are discussed through the comparative analysis of the parameters of the two types of geothermal springs,normal and trace chemical compositions,and the stable isotopes of H and O.The results show that Quzhuomu geothermal springs are recharged by meteoric water,and the components source is mainly water-rock interaction,and the water chemical type is mainly HCO3-Ca-Na type.Due to the long hydrochemical evolution process of Chaka and the mixing of a higher proportion of magma residual fluid,the water chemical type evolves into Cl-Na type.The estimation results of various geothermal thermometer show that the thermal reservoir temperature of Quzhuomu is between 98.8-181.3℃,and the proportion of cold water mixing before excretion is 43.4%,while the thermal reservoir temperature of Chaka(183.2-204.3℃)is significantly higher than that of Quzhuomu.Compared with Quzhuomu,the longer water cycle evolution process of Chaka geothermal springs,the mixing of a higher proportion of magma residual fluid and the higher thermal reservoir temperature,are the main cause mechanism that controls the large-scale deposition of silica during the discharge process of geothermal springs and the abnormal enrichment of some typical incompatible elements in the water body.关键词
地热泉/钙华/硅华/水化学演化/成因机制Key words
geothermal springs/travertine/silica sinter/hydrochemistry evolution/genesis mechanisms分类
天文与地球科学引用本文复制引用
丛婷婷,谭红兵,丛培鑫,石智伟,薛飞,张昱..西藏山南钙华与硅华大规模沉积型地热泉水化学演化对比研究[J].高校地质学报,2024,30(6):646-659,14.基金项目
第二次青藏高原综合科学考察项目(2022QZKK0202) （2022QZKK0202）
国家自然科学基金项目(U22A20573)联合资助 （U22A20573）
