摘要
笔者对滦平地区火山碎屑流冷却单元进行了深入的研究，划分出１２个冷却单元。每个单元自下而上可分为涌流堆积、碎屑流堆积及灰云堆积。火山喷发柱外缘陷落形成涌流堆积，喷发柱中间部分供给形成碎屑流堆积，碎屑流顶部物质析出和细的物质在流体通过后，从大气中沉积到表面形成灰云堆积。
The author deeply studied cooling unit of pyroclastic flow in Luanping area and divided the volcanic rock into 12 cooling units. Each unit consists upward of cutpouring flow accumulation, pyroclastic flow accumulation and ash cloud accumulation. The outpouring flow accumulation forms in the sunken area in outside the volcanic eruption column, the pyrolastic flow accumulation occurs in the volcanic eruption column with plaintive volcanic material supplying and the ash cloud accumulation is produced due to the fine material depositing from the air after the volcanic flow.
