长白山天池火山近代喷发中气象站组熔岩—碎屑岩流研究

中晚全新世以来，长白山天池火山的活动多为爆炸性喷发和形成火山碎屑流，熔岩流出较少，气象站组熔岩—碎屑岩流则是为数不多的熔岩溢流活动之一，它是天池火山一个寄生火山的喷发产物。气象站组熔岩—碎屑岩流的岩性为碱流岩质，岩浆粘度大，流动缓慢。据研究其喷发时间大约4 ka BP，应属天池火山的近代喷发产物。

Study of Mordern Erupted Lava Clastic Flow of Qixiangzhan Formation of Tianchi Volcano, Changbai Mountains

Since the mid and late Holocene, Tianchi volcano, the Changbai Mountains, has mostly erupted pumice and formed pyrocalstic flows, with lavas rarely overfl owed. The lava pyroclastic flow Qixiangzhan Fm. was one of those lava overflows that have occurred very scarcely,and was erupted from an parasitic crater, consist of comendite, which has a large viscosity and is overf l owed slowly. According to our study, the Qixiangzhan lava erupted in the mid a nd late Holocene, i. e. about 4 ka BP, belonging to modern eruptions.