Abstract:

The Changbaishan Tianchi volcano is one of the most famous volcanoes in China. It erupted many times in the Holocene time. The top of this volcano is regionally covered by some yellow material (pyroclastics), the origin of which has been under debating since its discovery. Based on the information provided by the eruption of Mount St Helens of USA on May 18th, 1980, in conjunction with the chemical composition and distribution characteristics of the yellow materials, we estimated that it resulted from hot water metasomatism during the Millennium eruption, rather than a separate product of an individual volcanic event.

Key words: Changbaishan Tiahchi volcano, yellow material, origin, hot water metasomatism

摘要：

长白山天池火山是中国著名的火山,全新世以来有过多次喷发。在长白山天池火山顶部局部地区发育1套黄色碎屑物质。但是,对于这套黄色物质的成因,一直存有争议。根据1980年5月18日美国圣海伦斯火山喷发的研究成果,以及长白山天池火山顶部黄色物质的化学成分、产出特征等,我们初步推测其成因为 "千年喷发"时热水交代作用的产物,而不是一次独立的火山喷发事件的产物。

关键词: 长白山天池火山, 黄色物质, 成因, 热水交代作用