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Authors: Fiebig, J.* 
Woodland, A. B.* 
D'Alessandro, W.* 
Püttmann, W.* 
Title: Excess methane in continental hydrothermal emissions is abiogenic
Issue Date: Jun-2009
Series/Report no.: 6/37(2009)
DOI: 10.1130/G25598A.1
Keywords: methane
isotopic composition
abiogenic hydrocarbons
Subject Classification04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry 
04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
Abstract: Thermogenic hydrocarbons entirely deriving from the thermal degradation of organic matter usually exhibit methane to ethane plus propane ratios smaller than 100. We present hydrocarbon distribution data of continental hydrothermal gases, whose methane has been independently identifi ed to derive from the abiogenic reduction of CO2. We fi nd that excess amounts of methane with respect to thermogenic hydrocarbon distributions are characteristic for the investigated gases. A similar pattern is observed for well discharges whose temperatures are too high to support any microbially mediated methanogenesis. These findings strongly suggest that abiogenic methane production in continental-hydrothermal systems is a more widespread process than previously assumed. The maximum contribution of such emissions to the modern atmospheric CH4 budget is estimated at ~1%.
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