长白山天池火山的气体地球化学特征与成因
发布时间：2019-06-11 17:07
【摘要】：长白山天池火山位于欧亚板块与太平洋板块相互作用的弧后构造环境，即华北板块北东缘与中新生代北东向滨太平洋的火山构造带交界处。自2002年以来，天池火山区地震频率增强、强度上升，同时，温泉水温度升高，地形变较大，，需加强对天池火山区活动性的监测。 本文在测试了长白山天池火山区聚龙温泉和锦江温泉的气体成分的基础上，探讨了天池火山区温泉气体组分特征与来源；同时，通过分步加热法释放该区火山岩的流体挥发分，并分析其组成特征和来源。火山气体地球化学的测试结果表明，聚龙温泉的温度（71.1℃），化学组成包括He（7×10-6）、CO2（83.02%）含量，以及3He/4He比值（3.92Ra)均低于往年测试结果；然而，相比于2012-2013年，锦江温泉的温度（58.3℃）、He（133×10-6）、CO2（94.06%）、3He/4He比值（5.81Ra)，呈现增高的趋势。火山岩的流体挥发分δ13CCH4值和δ13CC2H6值分别为-48.5‰～-30.6‰和-31.6‰～-21.3‰，所有样品均符合δ13CC2H6＜δ13CCH4的正碳同位素序列；其δ13CCO2值为-27.2‰～-11.4‰，均小于-10‰。 1999年至今的观测结果显示，两个温泉上述参数总体上较稳定。根据温泉气体的主微量及同位素组成，我们认为锦江温泉和聚龙温泉中逸出的气体为幔壳混合来源，其中锦江温泉受壳源物质的影响相对较小，而聚龙温泉逸出的气体含有较高的壳源物质，幔源物质的贡献相对较小。通过分步加热法释放的火山岩中的烷烃气和CO2均为有机成因。
[Abstract]:Changbai Mountain Tianchi volcano is located in the back-arc tectonic environment of the interaction between Eurasian plate and Pacific plate, that is, the junction of the north-eastern margin of the North China plate and the North-east to coastal Pacific volcanic tectonic belt of the North China plate. Since 2002, the frequency and intensity of earthquakes in Tianchi volcanic area have increased, at the same time, the temperature of hot spring water has increased and the topography has become larger, so it is necessary to strengthen the monitoring of the activity of Tianchi volcanic area. On the basis of testing the gas composition of Julong hot spring and Jinjiang hot spring in Tianchi Huoshan District, Changbai Mountain, this paper discusses the characteristics and sources of hot spring gas components in Tianchi Huoshan District, and releases the fluid volatile matter from volcanic rocks in this area by step heating method, and analyzes their composition characteristics and sources. The results of volcanic gas geochemistry show that the temperature (71. 1 鈩
本文编号：2497347
[Abstract]:Changbai Mountain Tianchi volcano is located in the back-arc tectonic environment of the interaction between Eurasian plate and Pacific plate, that is, the junction of the north-eastern margin of the North China plate and the North-east to coastal Pacific volcanic tectonic belt of the North China plate. Since 2002, the frequency and intensity of earthquakes in Tianchi volcanic area have increased, at the same time, the temperature of hot spring water has increased and the topography has become larger, so it is necessary to strengthen the monitoring of the activity of Tianchi volcanic area. On the basis of testing the gas composition of Julong hot spring and Jinjiang hot spring in Tianchi Huoshan District, Changbai Mountain, this paper discusses the characteristics and sources of hot spring gas components in Tianchi Huoshan District, and releases the fluid volatile matter from volcanic rocks in this area by step heating method, and analyzes their composition characteristics and sources. The results of volcanic gas geochemistry show that the temperature (71. 1 鈩
本文编号：2497347
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