Abstract
Volcanic rocks contain a small amount of gaseous, liquid, and solid organic compounds, present in inclusions in the minerals and intermineral pores of the rocks. The distribution of carbon isotopes in CH/sub 4/, C/sub 2/H/sub 8/ and C/sub 3/H/sub 8/, is the reverse of that of the hydrocarbon gases of sedimentary rocks. The content of bitumoids extracted by chloroform is less than a few thousandths of 1%. An investigation of the geological conditions of occurrence of CB in volcanic rocks, and the carbon-isotope composition, indicates that CB of abiogenic origin could not be the source of formation of CB deposits in the sedimentary cover. Middle Proterozoic metasedimentary rocks contain a considerable amount of methane and C/sub org/, but the CB content does not exceed thousandths of 1%. The isotopic composition of methane is light deltaC/sup 13/ = 3.82 to -6.0. It is concluded that life flourished in the Proterozoic age. Owing to metamorphism of the rocks and the accompanying decomposition and carbonization of the hydrocarbons, these deposits are not promising for finds of CB deposits, but could have a marked influence on formation of gas and oil deposits in the overlying Phanerozoic sediments.
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