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- W2561276303 abstract "A comprehensive study of seep carbonates at the top of the organic- rich Maastrichtian to Danian Moreno Formation in the Panoche Hills (CA) reveals the mechanisms of generation, expulsion and migration of biogenic methane which fed the seeps. Two selected outcrops show seep carbonates developed at the tip of sand dykes intrude up into the Moreno Formation from deeper sandbodies. Precipitation of methane-derived cements occurred in a succession of up to 10 repeated elementary sequences, each starting with a corrosion surface followed by dendritic carbonates, botryoidal aragonite, aragonite fans and finally laminated micrite. Each element of the sequence reflects three stages. First a sudden methane pulse extended up into the oxic zone of the sediments, leading to an aerobic oxidation of methane and carbonate dissolution. Secondly, after consumption of the oxygen, anaerobic oxidation of methane coupled with sulfate reduction triggered carbonate precipitation. Third, progressive diminishment of the methane seepage, lead to the deepening of the reaction front in the sediment and a lowering of precipitation rates. Carbonate isotopes, with δ13C as low as -51‰PDB, indicate a biogenic origin for the methane, while a 1D basin model suggests that the Moreno Formation was in optimal thermal conditions for bacterial methane generation at the time of seep carbonate precipitation. Methane pulses are interpreted to reflect drainage by successive episodes of sand injection into the gas-generating shale of the Moreno Formation. The seep carbonates of the Panoche Hills can thus be viewed as a record of methane production from a biogenic source rock by multiphase hydraulic fracturing." @default.
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- W2561276303 date "2017-08-01" @default.
- W2561276303 modified "2023-10-13" @default.
- W2561276303 title "Mechanisms of biogenic gas migration revealed by seep carbonate paragenesis, Panoche Hills, California" @default.
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- W2561276303 doi "https://doi.org/10.1306/10171616021" @default.
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