Geochemistry on mantle-derived volatiles in natural gases from eastern China oil/gas provinces (I )——Helium, argon and hydrocarbons in mantle volatiles

摘要

Researches on helium, argon, carbon dioxide and methane are very significant in studies of mantle substance characteristics and mantle evolution. A -shaped pattern of the isotope composition distribution of helium and argon sourced from the mantle and the crust, abundance distribution, isotopic composition and reservoir formation of carbon dioxide, and mantle-sourced methane are discussed.