海南岛温泉气体地球化学特征研究  

STUDY ON GEOCHEMICAL CHARACTERISTICS OF HOT SPRING GAS IN HAINAN ISLAND

作　　者：王锡娇[1] 魏费翔 王佳龙 郭明瑞[1] 卢启明[1] 张慧[1] WANG Xi-jiao;WEI Fei-xiang;WANG Jia-long;GUO Ming-rui;LU Qi-ming;ZHANG Hui(Hainan Earthquake Agency,Haikou 570203,Hainan,China;Key Laboratory of Active Tectonics and Volcano,Institute of Geology,China Earthquake Administration,Beijing 100029,China;Lingnan Normal University,Zhanjiang 524048,Guangdong,China)

机构地区：[1]海南省地震局,海南海口570203 [2]中国地震局地质研究所,北京100029 [3]岭南师范学院,广东湛江524048

出　　处：《内陆地震》2024年第1期13-21,共9页Inland Earthquake

基　　金：国家自然科学基金(42002301);海南省自然科学基金(422QN430).

摘　　要：为了查明海南岛温泉气体的起源,探讨海南岛温泉与琼北新生代火山活动的关系,通过对海南岛温泉气体成分和氮(N)同位素组成进行分析研究。结果表明:海南岛温泉气体以N 2为主,含量都在87%以上,个别样品达到90%以上,且均有CO_(2)共存。海南岛温泉气体δ^(15)N值均大于0,且断裂带集中地区的样品,其δ^(15)N值普遍偏大,而断裂带相对稀疏地区的样品,其δ^(15)N值相对较低,说明温泉气体主要受断裂带控制,主要来源为地壳和大气。此外,海南岛温泉气体不论是气体组合还是氦同位素特征,都与腾冲、长白山及五大连池活动火山区地热流体逸出气体明显不同,前者气体组合以N_(2)为主,后者主要以CO_(2)为主,前者He含量高,3He/4He低,而后者He含量低,3He/4He高。综合温泉气体成分和同位素特征,认为海南岛温泉气体主要为地壳和大气来源,少量为幔源混入,其温泉气体释放活动属于正常的断层气体活动,与琼北新生代火山活动关系不大。In order to find out the origin of spring gas in Hainan Island and explore the relationship between springs in Hainan Island and Cenozoic volcanic activity in northern Hainan,the gas composition and nitrogen(N)isotope composition of hot springs in Hainan Island were analyzed.The results show that the hot spring gas in Hainan Island is dominated by N_(2),with a content of more than 87%,and individual samples reach more than 90%,and CO_(2)coexists.Theδ^(15)values of the hot spring gas in Hainan Island are all greater than 0,and theδ^(15)values of the samples in the fault zone concentration area are generally larger,while theδ^(15)values of the samples in the relatively sparse fault zone area are relatively low,indicating that the hot spring gas is mainly controlled by the fault zone,and the main source is the crust and atmosphere.In addition,the gas composition and helium isotope characteristics of hot spring gases in Hainan Island are obviously different from those of geothermal fluids in Tengchong,Changbai Mountain and Wudalianchi active volcanic areas.The former is mainly composed of N 2,while the latter is mainly composed of CO_(2).The former has high He content and low 3He/4He ratio,while the latter has low He content and high 3He/4He ratio.Based on the composition and isotope characteristics of hot spring gas,it is considered that the hot spring gas in Hainan Island is mainly derived from the crust and atmosphere,and a small amount is mixed with mantle source.The release activity of hot spring gas is a normal fault gas activity,which is not related to the Cenozoic volcanic activity in northern Hainan Island.

关 键 词：氮同位素 温泉气体 气体地球化学 海南岛 

分 类 号：P315.7[天文地球—地震学]