Preliminary study on grain size distribution and transportation characteristics of the base-surge deposits near Longquanlongwan volcano crater, Jilin
吉林龙岗龙泉龙湾火山火口基浪堆积物粒度特征及搬运机制分析

Longquanlongwan is a composite low rimmed volcano formed by phreatomagmatic eruption.The volcanic strata near the crater are characterized by interlaying beds with coarse massive layers and fine thin layers.Many transporting and depositional features are developed in the base-surge deposits,such as lenticular structure,U-shaped channel,sag structure,dune form,climbing-up structure and gas segregation structure.The base-surge deposits are composed with pumices,lithics and crystals,in which the grains are of ...