北京西山东岭台组火山岩含水量的测定及地质意义

DETERMINATION OF WATER CONTENT IN VOLCANICROCKS OF DONGLINGTAI FORMATION, WESTERNMOUNTAIN, BEIJING, AND ITSGEOLOGICAL SIGNIFICANCE

东岭台期火山活动分5个阶段。各阶段均具独特的爆发特征,以第3阶段爆发性最强。本文用不同的测量和计算方法,讨论了不同阶段火山活动产物中水含量的变化特征,并从挥发份角度探讨了火山活动爆发强度的制约因素。

The volcanic activity in the Donglingtai period, may be subdivided into five stages, and it shows a typical explosive character. The author gives here the different measuring ways of volatiles and the results. It is considered that the water i. e. , its amounts and facies play an important role in the controlling of volcanic explosive types.