Anaerobic oxidation of methane in a cold-water coral carbonate mound from the Gulf of Cadiz

作者：Maignien L^*; Depreiter D; Foubert A; Reveillaud J; De Mol L; Boeckx P; Blamart D; Henriet J P; Boon N

来源：International Journal of Earth Sciences, 2011, 100(6): 1413-1422.

DOI：10.1007/s00531-010-0528-z

• Cold-water carbonate mound
• Anaerobic oxidation of methane
• Gulf of Cadiz
• Methane

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. (13)C-depleted DIC at the transition zone (-21.9aEuro degrees 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.

• 出版日期2011-9
• 单位中国地震局