Study pregress on volcanic phreatomagmatic eruption
火山射气岩浆喷发作用研究进展

As an essential and important type of volcanic activity on earth, phreatomagmatic eruption is characterized by groundwater-related explosive eruption and subsequent base surge deposit and maar lakes. Base surge deposit and maar lakes are widely distributed all over the world, and also in the Northeast China and the southern China. Study of phreatomagmatic eruption maybe dated back to 1921, and in the following over 80 years, many works have been done on phreatomagmatic eruption, using various of methods of volcanic geology, petrology, sedimentology, physical volcanology and digital modeling, to discuss its origin and mechanism. In this paper, we focuse on the maar lakes and base surge deposits of the phreatomagmatic eruptions in the Beibuwan district, southern China. Our research includes the geological feature, transportation and sedimentation model of the base surge deposit, the origin, mechanism and dynamics of the phreatomagmatic eruption. We generalized the past researching production to discover the special property of this type volcanic activity, promoting the study level about this area in our country.