GEOCHEMICAL CHARACTERISTICS ANE GENETIC ANALYSIS OF CO₂ FIELDS(POOLS) IN EAST CHINA

Numerous CO₂ fields(pools) of inorganic origin are discovered in east China.Usually their CO₂ contents exceed 6O%,and alkane gas contents are lower than 1O%.After an analysis of geochemical parameter s i.e.carbon isotopic composition and R/Ra value of CO₂,etc,plus a combination of the geological features of the related pools,the paper proposed that except those in Yingge marine basin,which have a metamorphic origin,the rest of CO₂ fields (pools) in east China can be attributed to predominantly an origin of mantle-derived volcano-magma.