火山喷发过程中岩浆脱气率和脱气量的估算方法及其意义  

A Method for Estimating the Degree and Mass of Magma Degassing during the Volcanic Eruption and Its Application

作　　者：张招崇[1] 李兆鼐[1] 李树才[2] 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]黑龙江省地质科学研究所,哈尔滨150036

出　　处：《岩石矿物学杂志》2000年第4期307-315,共9页Acta Petrologica et Mineralogica

基　　金：原地质矿产部地调局专项项目!(编号:地科专 96 - 17)的成果之一

摘　　要：本文对前人使用的火山喷发过程中岩浆脱气率和脱气量的估算方法进行了评述,并介绍了如何利用岩石学方法估算火山喷发不同阶段岩浆脱气率和脱气量的具体步骤,同时以镜泊湖地区全新世火山为例说明利用该方法估算的具体过程。估算结果表明不同气体在火山喷发过程中的脱气率是不同的,不能用包裹体中挥发分相对含量的高低来判断火山喷发所释放到大气圈中的气体类型和质量。该方法对火山学的研究具有重要意义。This paper discusses the merits and shortcomings of the estimation methods previously used for the degree and mass of magma degassing in the volcanic eruption. On the basis of these methods, the authors propose a new petrological method for the estimation performed at various stages in the process of volcanism, and illustrate the detailed steps as exemplified by the Jingpohu Holocene volcanic eruption. This example shows that the degrees of degassing are changeable in the eruption, and that the major volatiles and their released mass cannot be inferred in the light of their relative abundances in glass inclusions. Finally, the possible application of this new method is discussed.

关 键 词：火山喷发过程 脱气率 脱气量 岩浆 估算方法 

分 类 号：P317.3[天文地球—固体地球物理学]