کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4690213 | 1636123 | 2010 | 12 صفحه PDF | دانلود رایگان |
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.
Journal: Sedimentary Geology - Volume 228, Issues 3–4, 1 July 2010, Pages 292–303