Abstract
The Gulf of Cadiz is an area of mud volcanism and gas venting through the seafloor. In addition, several cold-water coral carbonate mounds have been discovered at the Pen Duick escarpment amidst the El Arraiche mud volcano field on the Moroccan margin. One of these mounds -named Alpha mound- has been studied to examine the impact of the presence of methane on pore-water geochemistry, potential sulphate reduction (SR) rate and dissolved inorganic carbon (DIC) budget of the mound in comparison with off-mound and off-escarpment locations. Pore-water profiles of sulphate, sulphide, methane, and DIC from the on-mound location showed the presence of a sulphate to methane transition zone at 350 cm below the sea floor. This was well correlated with an increase in SR activity. 13C-depleted DIC at the transition zone (−21.9‰ vs. Vienna Pee Dee Belemnite) indicated that microbial methane oxidation significantly contribute to the DIC budget of the mound. The Alpha mound thus represents a new carbonate mound type where the presence and anaerobic oxidation of methane has an important imprint on both geochemistry and DIC isotopic signature and budget of this carbonate mound.
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Acknowledgments
This project was funded by the EURODOM research training network programme from the European Commission under the 5th framework programme and by the European Science Foundation “Microsystems” project. LM, DD, and LDM are recipient of a scholarship from the Institute for the Promotion of Innovation through Science and Technology in Flanders (IWT-Vlaanderen). The authors wish to thank the crew and shipboard scientific party of the R/V Marion Dufresne led by Y. Balut (IPEV, Institut Paul Emile Victor) and of the R/V Maria S. Merian led by O. Pfannkuche (IFM-Geomar, Kiel). We are grateful to A. Stadnitskaia for her constructive comments on an earlier version of this work. We thank L. Wehrmann, P. de Schryver, and W. de Muynck for their help during manuscript preparation.
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Maignien, L., Depreiter, D., Foubert, A. et al. Anaerobic oxidation of methane in a cold-water coral carbonate mound from the Gulf of Cadiz. Int J Earth Sci (Geol Rundsch) 100, 1413–1422 (2011). https://doi.org/10.1007/s00531-010-0528-z
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DOI: https://doi.org/10.1007/s00531-010-0528-z