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Ruud T.e. Schüttenhelm - One of the best experts on this subject based on the ideXlab platform.
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surface and subsurface expressions of Gas Seepage to the seabed examples from the southern north sea
Marine and Petroleum Geology, 2005Co-Authors: B.m. Schroot, Gerard Th. Klaver, Ruud T.e. SchüttenhelmAbstract:Expressions of Gas Seepage observable within North Sea seismic and acoustic data include seabed pockmarks, Seepage plumes in the water column, acoustic blanking, shallow enhanced reflectors, and shallow seismic chimneys. Three areas were selected for a marine survey in
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Surface and subsurface expressions of Gas Seepage to the seabed – examples from the Southern North Sea
Marine and Petroleum Geology, 2005Co-Authors: B.m. Schroot, Gerard Th. Klaver, Ruud T.e. SchüttenhelmAbstract:Expressions of Gas Seepage observable within North Sea seismic and acoustic data include seabed pockmarks, Seepage plumes in the water column, acoustic blanking, shallow enhanced reflectors, and shallow seismic chimneys. Three areas were selected for a marine survey in
G. Bohrmann - One of the best experts on this subject based on the ideXlab platform.
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mud extrusion and ring fault Gas Seepage upward branching fluid discharge at a deep sea mud volcano
Scientific Reports, 2018Co-Authors: M. Loher, T. Pape, Y. Marcon, M. Römer, P. Wintersteller, Daniel Praeg, H. Sahling, Marta E Torres, G. BohrmannAbstract:Submarine mud volcanoes release sediments and Gas-rich fluids at the seafloor via deeply-rooted plumbing systems that remain poorly understood. Here the functioning of Venere mud volcano, on the Calabrian accretionary prism in ~1,600 m water depth is investigated, based on multi-parameter hydroacoustic and visual seafloor data obtained using ship-borne methods, ROVs, and AUVs. Two Seepage domains are recognized: mud breccia extrusion from a summit, and hydrocarbon venting from peripheral sites, hosting chemosynthetic ecosystems and authigenic carbonates indicative of long-term Seepage. Pore fluids in freshly extruded mud breccia (up to 13 °C warmer than background sediments) contained methane concentrations exceeding saturation by 2.7 times and chloride concentrations up to five times lower than ambient seawater. Gas analyses indicate an underlying thermogenic hydrocarbon source with potential admixture of microbial methane during migration along ring faults to the peripheral sites. The Gas and pore water analyses point to fluids sourced deep (>3 km) below Venere mud volcano. An upward-branching plumbing system is proposed to account for co-existing mud breccia extrusion and Gas Seepage via multiple surface vents that influence the distribution of seafloor ecosystems. This model of mud volcanism implies that methane-rich fluids may be released during prolonged phases of moderate activity.
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Mud extrusion and ring-fault Gas Seepage – upward branching fluid discharge at a deep-sea mud volcano
Scientific Reports, 2018Co-Authors: M. Loher, T. Pape, Y. Marcon, M. Römer, P. Wintersteller, Daniel Praeg, M. Torres, H. Sahling, G. BohrmannAbstract:Submarine mud volcanoes release sediments and Gas-rich fluids at the seafloor via deeply-rooted plumbing systems that remain poorly understood. Here the functioning of Venere mud volcano, on the Calabrian accretionary prism in ~1,600 m water depth is investigated, based on multi-parameter hydroacoustic and visual seafloor data obtained using ship-borne methods, ROVs, and AUVs. Two Seepage domains are recognized: mud breccia extrusion from a summit, and hydrocarbon venting from peripheral sites, hosting chemosynthetic ecosystems and authigenic carbonates indicative of long-term Seepage. Pore fluids in freshly extruded mud breccia (up to 13 °C warmer than background sediments) contained methane concentrations exceeding saturation by 2.7 times and chloride concentrations up to five times lower than ambient seawater. Gas analyses indicate an underlying thermogenic hydrocarbon source with potential admixture of microbial methane during migration along ring faults to the peripheral sites. The Gas and pore water analyses point to fluids sourced deep (>3 km) below Venere mud volcano. An upward-branching plumbing system is proposed to account for co-existing mud breccia extrusion and Gas Seepage via multiple surface vents that influence the distribution of seafloor ecosystems. This model of mud volcanism implies that methane-rich fluids may be released during prolonged phases of moderate activity.
Dirk Klaeschen - One of the best experts on this subject based on the ideXlab platform.
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Submarine Gas Seepage in a mixed contractional and shear deformation regime: Cases from the Hikurangi oblique‐subduction margin
Geochemistry Geophysics Geosystems, 2014Co-Authors: Andreia Plaza-faverola, Ingo Pecher, Gareth Crutchley, P. Barnes, Stefan Bünz, Thomas Peter Golding, Dirk Klaeschen, Cord Papenberg, Jörg BialasAbstract:Gas Seepage from marine sediments has implications for understanding feedbacks between the global carbon reservoir, seabed ecology and climate change. Although the relationship between hydrates, Gas chimneys and seafloor Seepage is well established, the nature of fluid sources and plumbing mechanisms controlling fluid escape into the hydrate zone and up to the seafloor remain one of the least understood components of fluid migration systems. In this study we present the analysis of new three-dimensional high-resolution seismic data acquired to investigate fluid migration systems sustaining active seafloor Seepage at Omakere Ridge, on the Hikurangi subduction margin, New Zealand. The analysis reveals at high resolution, complex overprinting fault structures (i.e. protothrusts, normal faults from flexural extension, and shallow (
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submarine Gas Seepage in a mixed contractional and shear deformation regime cases from the hikurangi oblique subduction margin
Geochemistry Geophysics Geosystems, 2014Co-Authors: Gareth Crutchley, P. Barnes, Stefan Bünz, Thomas Peter Golding, Andreia Plazafaverola, I A Pecher, Dirk KlaeschenAbstract:Gas Seepage from marine sediments has implications for understanding feedbacks between the global carbon reservoir, seabed ecology and climate change. Although the relationship between hydrates, Gas chimneys and seafloor Seepage is well established, the nature of fluid sources and plumbing mechanisms controlling fluid escape into the hydrate zone and up to the seafloor remain one of the least understood components of fluid migration systems. In this study we present the analysis of new three-dimensional high-resolution seismic data acquired to investigate fluid migration systems sustaining active seafloor Seepage at Omakere Ridge, on the Hikurangi subduction margin, New Zealand. The analysis reveals at high resolution, complex overprinting fault structures (i.e. protothrusts, normal faults from flexural extension, and shallow (<1 km) arrays of oblique shear structures) implicated in fluid migration within the Gas hydrate stability zone in an area of 2x7 km. In addition to fluid migration systems sustaining seafloor Seepage on both sides of a central thrust fault, the data show seismic evidence for sub-seafloor Gas-rich fluid accumulation associated with proto-thrusts and extensional faults. In these latter systems fluid pressure dissipation through time has been favored, hindering the development of Gas chimneys. We discuss the elements of the distinct fluid migration systems and the influence that a complex partitioning of stress may have on the evolution of fluid flow systems in active subduction margins.
Gareth Crutchley - One of the best experts on this subject based on the ideXlab platform.
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Submarine Gas Seepage in a mixed contractional and shear deformation regime: Cases from the Hikurangi oblique‐subduction margin
Geochemistry Geophysics Geosystems, 2014Co-Authors: Andreia Plaza-faverola, Ingo Pecher, Gareth Crutchley, P. Barnes, Stefan Bünz, Thomas Peter Golding, Dirk Klaeschen, Cord Papenberg, Jörg BialasAbstract:Gas Seepage from marine sediments has implications for understanding feedbacks between the global carbon reservoir, seabed ecology and climate change. Although the relationship between hydrates, Gas chimneys and seafloor Seepage is well established, the nature of fluid sources and plumbing mechanisms controlling fluid escape into the hydrate zone and up to the seafloor remain one of the least understood components of fluid migration systems. In this study we present the analysis of new three-dimensional high-resolution seismic data acquired to investigate fluid migration systems sustaining active seafloor Seepage at Omakere Ridge, on the Hikurangi subduction margin, New Zealand. The analysis reveals at high resolution, complex overprinting fault structures (i.e. protothrusts, normal faults from flexural extension, and shallow (
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submarine Gas Seepage in a mixed contractional and shear deformation regime cases from the hikurangi oblique subduction margin
Geochemistry Geophysics Geosystems, 2014Co-Authors: Gareth Crutchley, P. Barnes, Stefan Bünz, Thomas Peter Golding, Andreia Plazafaverola, I A Pecher, Dirk KlaeschenAbstract:Gas Seepage from marine sediments has implications for understanding feedbacks between the global carbon reservoir, seabed ecology and climate change. Although the relationship between hydrates, Gas chimneys and seafloor Seepage is well established, the nature of fluid sources and plumbing mechanisms controlling fluid escape into the hydrate zone and up to the seafloor remain one of the least understood components of fluid migration systems. In this study we present the analysis of new three-dimensional high-resolution seismic data acquired to investigate fluid migration systems sustaining active seafloor Seepage at Omakere Ridge, on the Hikurangi subduction margin, New Zealand. The analysis reveals at high resolution, complex overprinting fault structures (i.e. protothrusts, normal faults from flexural extension, and shallow (<1 km) arrays of oblique shear structures) implicated in fluid migration within the Gas hydrate stability zone in an area of 2x7 km. In addition to fluid migration systems sustaining seafloor Seepage on both sides of a central thrust fault, the data show seismic evidence for sub-seafloor Gas-rich fluid accumulation associated with proto-thrusts and extensional faults. In these latter systems fluid pressure dissipation through time has been favored, hindering the development of Gas chimneys. We discuss the elements of the distinct fluid migration systems and the influence that a complex partitioning of stress may have on the evolution of fluid flow systems in active subduction margins.
Andreia Plazafaverola - One of the best experts on this subject based on the ideXlab platform.
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submarine Gas Seepage in a mixed contractional and shear deformation regime cases from the hikurangi oblique subduction margin
Geochemistry Geophysics Geosystems, 2014Co-Authors: Gareth Crutchley, P. Barnes, Stefan Bünz, Thomas Peter Golding, Andreia Plazafaverola, I A Pecher, Dirk KlaeschenAbstract:Gas Seepage from marine sediments has implications for understanding feedbacks between the global carbon reservoir, seabed ecology and climate change. Although the relationship between hydrates, Gas chimneys and seafloor Seepage is well established, the nature of fluid sources and plumbing mechanisms controlling fluid escape into the hydrate zone and up to the seafloor remain one of the least understood components of fluid migration systems. In this study we present the analysis of new three-dimensional high-resolution seismic data acquired to investigate fluid migration systems sustaining active seafloor Seepage at Omakere Ridge, on the Hikurangi subduction margin, New Zealand. The analysis reveals at high resolution, complex overprinting fault structures (i.e. protothrusts, normal faults from flexural extension, and shallow (<1 km) arrays of oblique shear structures) implicated in fluid migration within the Gas hydrate stability zone in an area of 2x7 km. In addition to fluid migration systems sustaining seafloor Seepage on both sides of a central thrust fault, the data show seismic evidence for sub-seafloor Gas-rich fluid accumulation associated with proto-thrusts and extensional faults. In these latter systems fluid pressure dissipation through time has been favored, hindering the development of Gas chimneys. We discuss the elements of the distinct fluid migration systems and the influence that a complex partitioning of stress may have on the evolution of fluid flow systems in active subduction margins.
