Abstract: A systematical study of geochemical characteristics of gases in Wudalianchi volcanic area leads us to find that the main component of the gases is CO₂ and minor components are rare gas He,microgas H₂ and radioactive gas Rn.The gases are characteristic of post eruption volcanic gases.In plane distribution,CO₂ ejects in Laoheishan and Huoshaoshan latest eruption activity zone and tectionic activity area.The formation conditions and origin of CO₂ are analysed,and release amount of CO₂ is also roughly estimated.From February to April,1988,H₂ in the South Spring exhibits large-amplitude positive anomaly variation.We think it has ralation with nearby small earthquake cluster.The discover and study of a gas hole in ice cave at Laoheishan volcanic crater is important for monitoring and studying future volcanic activity.The gas from the volcanic gas hole is a mixed gas composed of He,H₂ and CO₂.We think this volcanic gas hole is related with deep structure and lalest volcanic eruption.

Key words: Heilongjiang, Wudalianchi, Recent volcano, Gas geochemistry

摘要： 根据五大连池火山区的气体地球化学特征,分析了二氧化碳气的生成条件和成因,对火山区CO₂的泄出量进行了概算。通过一年定点观测,查明了南泉和二龙眼泉各气体组分的动态变化特征,认为南泉氢和氦于1988年2月～4月出现的大幅度异常和附近的小震活动有关。

关键词: 黑龙江, 五大连池, 现代火山, 气体地球化学