无机成因天然气碳同位素组成变化的理论模式  

A Theoretical Model for the Effect of Outgassing on the Carbon Isotope Composition of Anorganic Natural Gas

作　　者：张学华[1] 郑永飞[1] 

机构地区：[1]中国科学技术大学地球和空间科学系

出　　处：《矿物岩石地球化学通报》1997年第2期13-17,共5页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金;中国科学院专项基金

摘　　要：无机成因天然气碳同位素组成变化的理论模式＊张学华郑永飞（中国科学技术大学地球和空间科学系，合肥２３００２６）关键词地球去气地球化学储库效应碳同位素理论模式地球内部是一个巨大的富含挥发组分的熔体流。挥发分可以随火山活动沿断裂等上升。随着压力和温度的降低...The effect of CO 2 degassing on the carbon isotope composition of natural gas has been modelled by assuming that the natural gas of anorganic origin is mainly composed of CH 4 and CO 2 The modelling is based on the principles of Rayleigh distillation in an open system Assuming the δ 13 C value of -5‰ for the initial reservoir,the outgassing of CO 2 can result in the large negative δ 13 C values of residual gas,which is about -10‰ to -30‰ for the residual CO 2 and about -30‰ to -50‰ for the residual CH 4 Therefore,the carbon isotope variations in natural gases can be caused by CO 2 degassing instead of biological origin

关 键 词：地球去气 地球化学 储库效应 碳同位素 理论模式 

分 类 号：P618.130.1[天文地球—矿床学]