中国东部典型地幔岩中包裹体成分研究及意义

COMPOSITIONS AND IMPLICATIONS OF INCLUSIONS IN THE TYPICAL MANTLE ROCKS FROM EAST CHINA

运用激光拉曼探针对中国东部地区新生代几个典型的玄武岩中橄榄岩包体和大别山—胶南造山带出露的超高压变质岩—榴辉岩包裹体的气液相成分进行了详细的测定，得出几个基本结论：（１）地幔流体中含有较高的气相组成，其中以无机的ＣＯ２、ＣＯ、Ｎ２、Ｈ２Ｓ为主；（２）地幔岩包裹体成分的不均一性反映了其源区的不均一性和地幔的交代作用；（３）在个别地幔岩包裹体中还检测到高含量的ＣＨ４和Ｈ２。上述事实表明中国东部郯庐断裂系统地幔深处可能蕴藏丰富的二氧化碳气体、烃类气体和其它可燃性的气体资源。本研究对中国东部地幔流体组成和无机成因的非烃气（特别是ＣＯ２气）成因和成藏的可能的探讨提供了重要证据。

Based on the analyses by LRM of the compositions of inclusions from the typical mantle rocks in East China,it come to the following conclusions:(1)The mantle fluids contain large amount of inorganic gaseous compositions,which mainly are Co 2,CO,N 2,H 2S and so on;(2)The variance of the compositions of the inclusions reflects the heterogeneity of the mantle fluid sources and the metasomatism of the mantle; (3)There are also high content CH 4 and H 2 in some inclusions of the typical mantle rocks.The above facts implicate that there may exist rich carbon dioxide gas resources,hydrocarbon gas resources and other combustible gas resources in the mantle of Tancheng Lujiang fault belt.The study in this paper has provided an important basis for the discussion of mantle fluid compositions,genesis of inorganic non hydrocarbon gases and possibility of reservoir forming in East China.