2020年新疆于田MS6.4地震温泉水文地球化学异常特征研究

doi:10.12196/j.issn.1000-3274.2021.02.009

摘要/Abstract

摘要： 2020年6月26日新疆于田县发生M_S6.4地震, 地震发生前后对震中80 km内的两个温泉在2019年9月至2020年10月的水文地球化学的变化特征进行了研究, 结果表明: ①温泉水的来源为其周围昆仑山的冰川融水, ②克孜勒沙衣温泉补给高程6 km, 水化学类型为Na-HCO₃、部分平衡水、温泉循环深度达到1.7 km左右, 其主要气体组分为N₂, 幔源氦占10.6%。 ③乌什开布隆温泉补给高程为3.1 km, Ca·Na-HCO₃·SO₄型, 未成熟水, 可能与浅层冷水发生了混合作用, 循环深度仅达到0.5 km, 该温泉的水化学组分对周围的地震活动有明显的异常响应, 伽师M_S6.4地震前, 区域应力的不断加载使断裂带内裂隙发生明显变化, 从而温泉流体行为发生变化, 使乌什开布隆温泉的离子浓度小幅度上升, 且Cl^-含量在于田M_S6.4地震后16天突增。因此, 对乌什开布隆温泉及克孜勒沙衣温泉的流体地球化学特征进行连续监测, 可以为未来阿尔金断裂及西昆仑断裂的交会区地震危险性提供有效判断指标。

关键词: 流体地球化学, 温泉, 震后响应, 2020年于田M_S6.4地震

Abstract: The spatial-temporal variations of fluid geochemistry in two hot springs within 80 km of the epicenter of Yutian M_S6.4 earthquake were studied from September 2019 to October 2020. The results show that: ① the meltwater from the Kunlun Mountains act as the water source of the hot springs. ② The recharge elevation is 6 km of Kezileshayi and the types of water chemistry is Na-HCO₃ and Partially equilibrium water and the circulation depth is about 1.7 km and the main gas group is N₂ and mantle derived helium accounts for 10.6%. ③ The recharge height of Wushikaibulong is 3.1 km, the hydrochemical type is Ca·Na-HCO₃·SO₄, immature water, the circulation depth of the hot spring reach about 0.5 km which may have mixed with shallow cold water. The hydrogeochemical response to the earthquake in the region of Wushikaibulong was obvious. The regional stress has obvious changes within the fault fissure before the earthquake of M_S6.4 in Jiashi which cause hot fluid behavior change and the ion concentration of Wushikaibulong hot spring increased slightly, the concentration of Cl^- also increased sharply 16 days after the M_S6.4 Yutian earthquake. Therefore, the continuous monitoring of fluid geochemical characteristics in Wushikaibulong and Kezileshayi hot springs could provide an effective indicator for judging the seismic risk in the intersection area of Aerjin fault and West Kunlun fault.

Key words: Fluid geochemical, Hot spring, Aftershock response, the 2020 Yutian M_S6.4 earthquake

中图分类号:

P315.7

颜玉聪, 周晓成, 李静超, 刘峰立, 欧阳澍培. 2020年新疆于田M_S6.4地震温泉水文地球化学异常特征研究[J]. 地震, 2021, 41(2): 113-128.

YAN Yu-cong, ZHOU Xiao-cheng, LI Jing-chao, LIU Feng-li, OUYANG Shu-pei. Hydrogeochemical Anomaly Characteristics of Hot Springs Around the 2020 Yutian M_S6.4 Earthquake, Xinjiang[J]. EARTHQUAKE, 2021, 41(2): 113-128.

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