TY - JOUR T1 - ROV study of a giant pockmark on the Gabon continental margin A1 - Ondreas,Helene A1 - Olu,Karine A1 - Fouquet,Yves A1 - Charlou,Jean-Luc A1 - Gay,Aurelien A1 - Dennielou,Bernard A1 - Donval,Jean-Pierre A1 - Fifis,Alexis A1 - Nadalig,Thierry A1 - Cochonat,Pierre A1 - Cauquil,E A1 - Bourillet,Jean-Francois A1 - Le Moigne,Morgan A1 - Sibuet,Myriam AD - IFREMER, Dept Geosci, F-29280 Plouzane, France. AD - IFREMER, Dept Environm Profond, F-29280 Plouzane, France. AD - Univ Montpellier 2, Lab GTS, F-34095 Montpellier, France. AD - Univ Strasbourg 1, Lab Microbiol & Genet, CNRS, FRE 2326,Inst Bot, F-67083 Strasbourg, France. AD - TOTAL, F-92400 Courbevoie, France. AD - IFREMER, F-44311 Nantes, France. UR - https://archimer.ifremer.fr/doc/00000/1239/ DO - 10.1007/s00367-005-0213-6 KW - Gabon KW - Microbathymetric map KW - ROV KW - Exploration KW - Pockmark KW - Equatorial African margin N2 - A giant, 800-m wide pockmark, called Regab, was discovered along the Equatorial African margin at 3160-m water depth and was explored by remote operated vehicle (ROV) as part of the Zaiango (1998-2000) and Biozaire (2001-2003) projects carried out conjointly by TOTAL and a number of French research institutes. A microbathymetric map obtained using the ROV sensors shows that the pockmark actually consists of a cluster of smaller pockmarks aligned N70 along a 15-m deep depression. Methane was recorded all over the pockmark, the highest values along the axis of the depression where massive carbonate crusts and dense seep communities were also found. Several faunal species belong to the Vesicomyidae and Mytilidae bivalve families, as well as to Siboglinidae (Vestimentifera) tubeworms. Preliminary analyses confirm their association with symbiotic bacteria, thus documenting their dependence on fluid seeps. The pockmark appears to be related to an infilled channel, visible on the seismic data 300 in below the seafloor, which may act as a reservoir for biogenic fluids supplied to the trap from the surrounding sediments. Y1 - 2005/11 PB - Springer JF - Geo-Marine Letters SN - 0276-0460 VL - 25 IS - 5 SP - 281 EP - 292 ID - 1239 ER -