Discovery of massive seafloor gas seepage along the Wagner Fault, northern Gulf of California

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• 作者：Carles Canet ; Rosa Marí ; a Prol-Ledesma ; Paul R. D ; o ; Viridiana Vá ; zquez-Figueroa ; Evgueni Shumilin ; Elisabet Birosta ; Alberto Sá ; nchez ; Carlos J. Robinson ; Antoni Camprubí ; Esperan&#x
• 关键词：Bubble seep ; Hydroacoustic flare ; Rifting ; Mud volcano ; Barite ; Chemosynthetic
• 刊名：Sedimentary Geology
• 出版年：2010
• 出版时间：1 July 2010
• 年：2010
• 卷：228
• 期：3-4
• 页码：292-303
• 全文大小：4553 K

文摘

Large-scale gas seepage and fluid ejection features are described from the edges of the active pull-apart Wagner and Consag basins (northern Gulf of California, Mexico), at water depths between  65 and 150 m. Gas vents, pockmarks, possible mud volcanoes, pyrite- and barite-rich sediments, slabs of lithified shell debris, and chemosynthetic fauna were found. Gas venting occurs mainly through N–S synsedimentary small-scale faults and fault-propagation folds that are believed to derive from the Wagner Fault. The presumed mud volcanoes are sub-rounded, domed bathymetric features, several hundreds of metres across, underlain by gas-charged sediments and surrounded by gas vents. Upward gas migration throughout the thick sedimentary sequence produces the fluid expulsion features on the sea floor.