Citation: | NIU Xinsheng, LIU Xifang, LÜ Yuanyuan, WU Qian. 2023. Origin mechanism of thermal springs and their supply of minerals to the salt lake(Li-Rb-Cs) in the Tangqung Co watershed of Tibet[J]. Geology in China, 50(4): 1163-1175. doi: 10.12029/gc20220527001 |
This paper is the result of mineral exploration engineering.
The Tangqung Co area in Tibet is located in the north of Tangra Yum Co-Xuru Co rift. The presence of geothermal springs in locations like Qurebaima and Zhariqusheng has prompted the need for a comprehensive study of their hydrochemical characteristics and origin, particularly regarding their contribution of Li and Rb substances to the Tangqung Co salt lake.
This study involved the collection and analysis of six spring water samples to determine their chemical composition and stable isotopes. Various chemical coefficients and mineral saturation indices were calculated, and cluster analysis was performed on the chemical components of the springs.
The findings reveal that Qurebaima spring waters exhibit enrichments in elements such as Li, B, Rb, and Cs. These springs are influenced by atmospheric rainfall and snowmelt, displaying shallow circulation characteristics. The springs' extended flow path and substantial water-rock interaction contribute to the predominance of HCO3- originating from carbonate rocks and CO2 produced by magmatic activity. Moreover, the calculated thermal reservoir temperature based on SiO2 geothermometers falls within the range of 123.33 to 128.22℃ for Qurebaima samples.
Geothermal activity in the Tangqung Co area is governed by the N-S trending Tangra Yum Co-Xuru Co rift valley, wherein the geothermal water acquires Li, Rb, Cs, and other trace elements through interactions with silicate minerals. Additionally, the water-rock interaction extends to the Permian and Cretaceous carbonate rocks, ascending along active faults in the region, and ultimately mixing with water from the Tangqung Co lake. This phenomenon suggests that the formation of Li and Rb-rich salt lakes in Tibet may be associated with extensive N-S rift activities, which not only provide geographic space for the accumulation and mineralization of salt lakes but also act as conduits between deep sources and surface environments.
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The tectonic map of Tangra Yum Co-Xuru Co rift (a, modified from Xie Guogang et al., 2013, 2014) and sketch map showing the distribution of rifts in Qinghai-Tibet Plateau (b, modified from Li Yalin et al., 2005)
Geological sketch map of sampling site in the study area
Piper graph for classification of all the samples
δD-δ18O relations of spring waters in study region
Cluster analysis diagram of spring waters (a-Q cluster analysis; b-R cluster analysis)
Na-K-Mg giggenbach plot with spring water samples in study area