摘要
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.
The Tianchi volcano in the Changbai Mountains is located on the boundarybetween China and North Korea. There are many times of eruptions of the Tianchi volcano during theHolocene. One of its large eruptions occurred around 1000 years ago dated by ^(14)C method andhistorical records. Composition of products of the largest Tianchi volcanic eruption studied ischaracterized by comendi-tic Plinian fallout and unwelded ignimbrite, which are mainly distributedin 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 TianchiLake is located on the summit of the volcanic cone, that is also highest peak of the ChangbaiMountains in northeastern China. This study analyzed Cl, F, S and H_2O concentrations of meltinclusions in the phenocryst minerals (anorthoclase and quartz) and co-existing matrix glasses usingthe electron microprobe and estimated environmental effect of Tianchi volcanic gases. The authorsproposed a new method to evaluate future eruption of active volcano and estimate potential volcanichazards based on contents of volatile emissions. Using this method, we made a perspective of futurevolcanic hazard in this region.
基金
supported by the National Natural Science Foundation of China(Grant No.40372045)
the Chinese Academy of Sciences(Grant No.KZCX3-SW-145).
