| Effect of gas emissions from Tianchi volcano (NE China) on environment and its potential volcanic hazards |
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| 基金项目： | 中国科学院资助项目;中国科学院资助项目 |
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| 摘 要： | One of largest eruptions in the Tianchi volcano during the Holocene occurred in about 1000 years ago1―3]. The volcanic ash erupted had been found in Japan, which is more than 1000 km from the Tianchi volcanic vent4,5]. Moreover, this eruption has been recognized in the study of Greenland ice core (GISP2)6,7]. There have been many studies about eruption products of the Tianchi volcano, which dominantly focused on petrological, geochemical and volcanic eruptive dynamic aspects8―10]. On…
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| 收稿时间： | 20 December 2004 |
| 修稿时间： | 21 June 2005 |
Effect of gas emissions from Tianchi volcano (NE China) on environment and its potential volcanic hazards |
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| Authors: | GUO Zhengfu LIU Jiaqi HAN Jingtai HE Huaiyu DAI Guoliang YOU Haitao |
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| Institution: | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | The Tianchi volcano in the Changbai Mountains is located on the boundary between China and North Korea. There are many times of eruptions of the Tianchi volcano during the Holocene. One of its large eruptions occurred around 1000 years ago dated by 14C method and historical records. Composition of products of the largest Tianchi volcanic eruption studied is characterized by comendi- tic Plinian fallout and unwelded ignimbrite, which are mainly distributed in China and North Korea. Caldera is about 4.4 km long and 3.4 km wide, which had filled with water (e.g. Tianchi Lake). The Tianchi volcanic cone is about 2700 m high above sea level. The Tianchi Lake is located on the summit of the volcanic cone, that is also highest peak of the Changbai Mountains in northeastern China. This study analyzed Cl, F, S and H2O concentrations of melt inclusions in the phenocryst min- erals (anorthoclase and quartz) and co-existing matrix glasses using the electron microprobe and estimated environmental effect of Tianchi volcanic gases. The authors proposed a new method to evaluate future eruption of active volcano and estimate potential volcanic hazards based on contents of volatile emissions. Using this method, we made a perspective of future volcanic hazard in this re- gion. |
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| Keywords: | Tianchi volcano volcanic gas environmental change volcanic hazard monitoring active volcano |
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