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热液伴生气体组成对分析热液来源,评估热液区岩浆活动的活跃程度,进而评估其生态环境效应具有重要意义。利用自制的活塞式水中游离气体取样器采集台湾龟山岛和绿岛上热液喷口热液活动伴生气体样品,采用MAT271型质谱计对其组分进行了分析。结果表明,龟山岛热液区热液活动伴生气体以CO2为主,显示出高含量CH4、CO2和H2S等活性气体,低含量SO2、HCl等低温火山区温泉释放气体的特点;2011年龟山岛白泉喷口和黄泉喷口热液气体中CO2、N2、CH4的平均含量分别为642.8‰、149.4‰、177.5‰和740.1‰、36.7‰、30.9‰。绿岛陆上热泉热液活动伴生气体以惰性气体N2为主,富含CH4,较少CO2、H2S等活性气体;2012年绿岛朝日温泉煮蛋区和绿岛潮间带近岸侧温泉池的热液气体中CO2、N2、CH4的平均含量分别为1.1‰、805.8‰、126.9‰和34.4‰、7.9‰、899.5‰。推测龟山岛附近海域热液区伴生气体来源比绿岛陆上热泉伴生气体可能更深,前者在向上运移的过程中与围岩的反应弱于后者。
It is of great significance to analyze the source of hydrothermal fluids, assess the activity of magmatic activity in the hydrothermal zone and assess the ecological environment effect. A homemade piston-type free-gas sampler was used to collect the associated gas samples from hydrothermal vents in Guiyang Island and Green Island, Taiwan. The composition of the samples was analyzed by MAT271 mass spectrometer. The results show that the gas associated with the hydrothermal activity in the Tuishang Island hydrothermal area is dominated by CO2, which shows the characteristics of high-content active gases such as CH4, CO2 and H2S, and low-temperature hot springs in volcanic areas such as SO2 and HCl; The average contents of CO2, N2 and CH4 in the Shantou white spring spout and the Huangquan spout are respectively 642.8 ‰, 149.4 ‰, 177.5 ‰ and 740.1 ‰, 36.7 ‰ and 30.9 ‰. The associated gas of the Green Island terrestrial thermal spring hydrothermal activity is mainly composed of inert gas N2, which is rich in active gas such as CH4, less CO2 and H2S. In 2012, Green Island Asahi Hot Spring boiled egg area and Green Island intertidal near shore hot spring The average contents of CO2, N2 and CH4 in the pool are 1.1 ‰, 805.8 ‰, 126.9 ‰ and 34.4 ‰, 7.9 ‰ and 899.5 ‰, respectively. It is speculated that the source of associated gas in the hydrothermal area near Guishan Island may be deeper than that associated with the Green Island terrestrial thermal spring, and the former is weaker than the latter in the upward migration.