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The stability and isotopic composition of hydrocarbons formed in the mantle are controversial subjects. Knowing the range in isotopic compositions of abiogenically-derived hydrocarbons is important for recognising biological signatures in ancient and extra-terrestrial materials. In an effort to enhance this database, stable isotope results are reported here for hydrocarbon-bearing fluid inclusions...
The persodic, 1.16 Ga old Ilímaussaq intrusion consists of alkali granites, syenites, and agpaitic nepheline syenites. These rocks are cut by late-magmatic veins and lenses consisting of albite, aegirine, ussingite (Na 2 AlSi 3 O 8 (OH)), fluorite, and occasionally quartz. Oxygen-isotope compositions of quartz indicates both orthomagmatic (δ 18 O qtz =8.5‰)...
A new method is described for on-line extraction of complex mixtures of fluid inclusion volatiles for compound specific carbon- and hydrogen-isotope determination by gas-chromatography–continuous flow mass-spectrometry. Reproducibility for multiple aliquots of gas released from single samples and for duplicate samples is generally ≤±0.7‰ for δ 13 C measurements of hydrocarbon and CO 2...
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