Origin of light hydrocarbons from volcanic rocks in the “Green Tuff” region of northeast Japan: Biogenic versus magmatic
作者： Susumu Sakata , Makoto Takahashi , Shun-Ichiro Igari , Noriyuki Suzuki
DOI: 10.1016/0009-2541(89)90035-1
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摘要: Abstract Geochemical analyses were carried out to assess the origin of light hydrocarbons in natural gases derived from volcanic rocks “Green Tuff” region northeast Japan, whose high He isotope ratios have suggested a possible magma gas component. Biogenic steroid detected unambiguously oils associated with gases, and they showed similar molecular distributions C 27 29 as those accumulated adjacent sedimentary rocks. Correlation 1 ( 2 + 3 ) vs. δ 13 CH 4 for indicated that are thermocatalytic products organic matter. On assumption magmatic ratio is 10 6 , no more than 0.1% total methane can be attributed origin. The remaining likely migrated layers.
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