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Isotope Analysis on Nano-Mole Gas Samples

A technique of isotope analysis has been adopted for extremely small-size samples. Amounts of 50–100 nmol of CO2 extracted from gaseous inclusions in natural quartz show δ13C values around –24‰ which indicate an organic origin of this gas, while dispersed hydrocarbons extracted from Permian sediments (mainly CH4) have δ13C below –40‰.