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  魏费翔,许建东,上官志冠,潘波.中国火山温泉气体地球化学特征及其在火山监测中的应用[J].震灾防御技术,2018,(4):938-949, DOI:10.11899/zzfy20180421.

中国火山温泉气体地球化学特征及其在火山监测中的应用
摘要:    中国火山温泉主要分布在吉林长白山、云南腾冲和黑龙江五大连池等火山区。这些火山虽然处于休眠状态,但大面积的温泉分布指示着岩浆房存在的可能性。本文总结了前人研究成果,分析了中国主要火山区温泉气体地球化学特征,并探讨了温泉气体在火山监测中的应用。长白山、腾冲和五大连池火山区温泉气体地球化学性质类似,都以CO2为主要气体,含量在80%以上,最高可达99%以上,其它气体组分包括CH4、N2、O2、SO2、H2S、He和H2等。长白山火山温泉气体中氦同位素比值(3He/4He)最高,约为4—6RA,CO2中碳同位素比值(δ13C)为-7.9‰—-1.3‰,CH4中碳同位素为-48.0‰—-28.7‰;腾冲火山温泉气体氦同位素比值为3—5.5RA,CO2中的碳同位素为-6.49‰—-2.07‰,CH4中碳同位素为-23.5‰—-9.3‰;五大连池火山温泉气体氦同位素比值约为3RA,CO2中的碳同位素比值为-9.6‰—-3.1‰,CH4中碳同位素为-47.2‰—-44.4‰。3个火山区的温泉气体均显示地幔来源的岩浆气体特征,并在上升运移过程中受地壳或古俯冲物质的影响。
作者单位
魏费翔 中国地震局地质研究所, 活动构造与火山重点实验室, 北京 100029 
许建东 中国地震局地质研究所, 活动构造与火山重点实验室, 北京 100029 
上官志冠 中国地震局地质研究所, 活动构造与火山重点实验室, 北京 100029 
潘波 中国地震局地质研究所, 活动构造与火山重点实验室, 北京 100029 
关  键  词:火山温泉  地球化学  同位素  火山监测
DOI:10.11899/zzfy20180421
基金项目:中央级公益性科研院所基本科研业务专项(IGCEA1603)
收稿日期:2018-04-12
作者简介:魏费翔,男,生于1991年。助理研究员。主要从事火山流体地球化学和岩石地球化学。E-mail:weifeixiang@ies.ac.cn
通讯作者:许建东,男,生于1962年。研究员。主要从事火山学研究和火山监测。E-mail:xujiandong@ies.ac.cn
Geochemical Characteristics of Volcanic Hot Spring Gas in China and its Applications in Volcanic Monitoring
Abstract:      The volcanic hot springs in China are mainly distributed in the Changbaishan volcanic region in Jilin Province, the Tengchong volcanic region in Yunnan Province, and the Wudalianchi volcanic region in Heilongjiang Province. Although these volcanoes are dormant, wide distribution of hot springs indicates the existence of magma chambers. This paper summarizes the results of previous studies, analyzes the geochemical characteristics of hot spring gas in major volcanic regions of China, and discusses the applications of hot spring gases in volcano monitoring. The geochemical characteristics of the hot spring gases in the Changbaishan, Tengchong, and Wudalianchi volcanic regions are similar, with CO2 as the main gas, the content of which is above 80%, and the highest is more than 99%. Other gas components including CH4, N2, O2, SO2, H2S, He and H2. The helium isotopic ratios (3He/4He) in the Changbaishan volcanic hot spring gases are the highest, about 4-6RA. The carbon isotopes (δ13C) in CO2 are from -7.9‰ to -1.3‰ and the carbon isotopes in CH4 are between -48.0‰ and -28.7‰. The helium isotopic ratios of the Tengchong volcanic hot spring gases are 3-5.5RA. The carbon isotopes of CO2 are from -6.49‰ to 2.07‰ and from -22.22‰ to -13.70‰ in CH4. The helium isotopic ratios of the Wudalianchi volcanic hot spring are about 3RA. The carbon isotopic ratios in CO2 are between -9.6‰ and -3.1‰ and from -47.2‰ to -44.4‰ in CH4. The hot spring gases in the three volcanic areas all indicate mantle sources, which may be contaminated by the crustal or ancient subduction materials during the up-immigration processes. Combined with the results of earthquakes and topographic deformation, the geochemical characteristics of gases in volcanic hot springs are of great importance to the monitoring of active volcanoes.
Keywords:  Volcanic hot springs  Geochemical characteristics  Isotopes  Volcanic monitoring
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