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Feng, Dong; Lin, Zhijia; Bian, Y; Chen, Duofu; Peckmann, Jörn; Bohrmann, Gerhard; Roberts, Harry H (2013): Rare earth elements of modern seeps from the Gulf of Mexico, the Black Sea, and the Congo Fan. PANGAEA,, Supplement to: Feng, D et al. (2013): Rare earth elements of seep carbonates: Indication for redox variations and microbiological processes at modern seep sites. Journal of Asian Earth Sciences, 65, 27-33,

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At marine seeps, methane is microbially oxidized resulting in the precipitation of carbonates close to the seafloor. Methane oxidation leads to sulfate depletion in sediment pore water, which induces a change in redox conditions. Rare earth element (REE) patterns of authigenic carbonate phases collected from modern seeps of the Gulf of Mexico, the Black Sea, and the Congo Fan were analyzed. Different carbonate minerals including aragonite and calcite with different crystal habits have been selected for analysis. Total REE content (SumREE) of seep carbonates varies widely, from 0.1 ppm to 42.5 ppm, but a common trend is that the SumREE in microcrystalline phases is higher than that of the associated later phases including micospar, sparite and blocky cement, suggesting that SumREE may be a function of diagenesis. The shale-normalized REE patterns of the seep carbonates often show different Ce anomalies even in samples from a specific site, suggesting that the formation conditions of seep carbonates are variable and complex. Overall, our results show that apart from anoxic, oxic conditions are at least temporarily common in seep environments.
Related to:
Birgel, Daniel; Feng, Dong; Roberts, Harry H; Peckmann, Jörn (2011): Changing redox conditions at cold seeps as revealed by authigenic carbonates from Alaminos Canyon, northern Gulf of Mexico. Chemical Geology, 285(1-4), 82-96,
Chen, Duo Fu; Huang, Yong Yang; Yuan, Xun Lai; Cathles III, Lawrence M (2005): Seep carbonates and preserved methane oxidizing archaea and sulfate reducing bacteria fossils suggest recent gas venting on the seafloor in the Northeastern South China Sea. Marine and Petroleum Geology, 22(5), 613-621,
Feng, Dong; Chen, Duofu; Peckmann, Jörn; Bohrmann, Gerhard (2010): Authigenic carbonates from methane seeps of the northern Congo fan: Microbial formation mechanism. Marine and Petroleum Geology, 27, 748-756,
Feng, Dong; Chen, Duofu; Qi, Yuzao; Roberts, Harry H (2008): Petrographic and geochemical characterization of seep carbonate from Alaminos Canyon, Gulf of Mexico. Chinese Science Bulletin, 53(11), 1716-1724,
Peckmann, Jörn; Reimer, Andreas; Luth, U; Luth, C; Hansen, Bent T; Heinicke, C; Hoefs, Jochen; Reitner, Joachim (2001): Methane-derived carbonates and authigenic pyrite from the northwestern Black Sea. Marine Geology, 177(1-2), 129-150,
Median Latitude: 26.901867 * Median Longitude: -12.411556 * South-bound Latitude: -6.184000 * West-bound Longitude: -94.516667 * North-bound Latitude: 45.166667 * East-bound Longitude: 32.000000
Date/Time Start: 2002-05-05T00:00:00 * Date/Time End: 2002-12-21T13:26:00
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