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Title:: Changes of Hydrochemistry and CO₂ Gases Release Characteristics of the Xiagei and Tianshengqiao Hot Springs in Shangrila,Yunnan

Author(s):: LI Qilin; WANG Yun; ZHAO Ciping; ZHOU Yiying; RAN Hua; (Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

Keywords:: hot springs; hydrochemistry characteristics; CO₂ gases release; helium and carbon isotopes; Shangrila earthquake

摘要:: 为探讨云南省香格里拉市下给和天生桥温泉水化学和逸出气CO₂的变化特征与其周边断裂及2013年香格里拉M_S5.9地震之间的关系,对比研究了1981,2004,2013,2016和2017年这2处温泉水化学分析测试数据,利用2004和2017年2处温泉的逸出气体组成和He,C同位素数据分析逸出气CO₂释放情况和来源。结果表明:下给和天生桥温泉在香格里拉M_S5.9地震前后Ca²⁺,Mg²⁺和游离态CO₂含量有由低变高、再变低的变化。2处温泉逸出气体皆显示高含量的CO₂释放,但2017年释放含量有所减少,且He,C同位素皆存在幔源入侵的特征。

Abstract:: In order to discuss the relationship between the hydrochemistry and CO₂ gas release changes of the Xiagei and Tianshengqiao hot springs in Shangrila,Yunnan and their surrounding faults and the Shangrila M_S5.9 earthquake in 2013,we compared and stuided the hydrochemistry test results of these two hot springs in 1981,2004,2013,2016 and 2017. Then we analyzed CO₂ release gas and source based on gas composition and He and C isotope data of Xiagei and Tianshengqiao hot springs in 2004 and 2017. The results show that Ca²⁺,Mg²⁺ and free CO₂ concentrations of the Xiagei and Tianshengqiao hot springs is obviously increased then decreased again before and after the Shangrila M_S5.9 earthquake. Both the content of CO₂ release gas from Xiagui and Tianshengqiao hot springs show high,but it decreased in 2017. The He and C isotopes of both hot springs have characteristics of mantle source.