The structures beneath submarine methane seeps: Seismic evidence from Opouawe Bank, Hikurangi Margin, New Zealand

Netzeband, Gesa; Krabbenhoeft, Anne; Zillmer, Matthias; Petersen, Carl Jörg; Papenberg, Cord; Bialas, J.

doi:10.1016/j.margeo.2009.07.005

Cited by 48 publications

(34 citation statements)

References 50 publications

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“…The range of carbon isotope values of SPNs of Exposure B (Fig. 4; Table 1) indicates that they should be derived from another carbon source, e.g., residual CO 2 from methanogenesis (δ Cold seeps are highly associated with geological structures, especially faults, in various tectonic settings (Sample and Reid 1998;Aiello 2005;Gay et al 2007;Judd and Hovland 2007;Zitter et al 2008;Barnes et al 2010;Conti et al 2010;Netzeband et al 2010). Sample and Reid (1998) concluded that the fluid sources for precipitating ACCs were controlled predominately by different fault regimes.…”

mentioning

confidence: 99%

Patterns and Sizes of Authigenic Carbonate Formation in the Pliocene Foreland in Southwestern Taiwan: Implications of an Ancient Methane Seep

Chien¹,

Huang²,

Lee³

et al. 2013

Terr. Atmos. Ocean. Sci.

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Several dolomitic authigenic carbonate concretions (ACCs) are preserved in the Pliocene foreland sequence in southwestern Taiwan. Carbon isotopic signatures and the morphology of these carbonates and associated chemosymbiotic bivalve fossils reveal their methane seep origin. There are three types of ACCs: (1) massive brecciated blocks (MBBs; δ Atmos. Ocean. Sci., 24, 971-984, doi: 10.3319/TAO.2013.07.05.01(TT)

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confidence: 99%

Patterns and Sizes of Authigenic Carbonate Formation in the Pliocene Foreland in Southwestern Taiwan: Implications of an Ancient Methane Seep

Chien¹,

Huang²,

Lee³

et al. 2013

Terr. Atmos. Ocean. Sci.

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“…Since fluid chimneys like the one observed at the BPU have been inferred to initiate by faulting (e.g. Netzeband et al, 2010), we propose that seal failure at the GGV also occurred by this process. The chimney feature must then have formed after deposition of the BPU, i.e.…”

Section: Recent Reactivation Of the Ggvmentioning

confidence: 83%

“…6). We interpret these discontinuities as hydro-fractures, which can trigger mud diapirism and volcanism (Dimitrov, 2002;Deville et al, 2010) but are also associated with the initiation and upward propagation of gas (Hustoft et al, 2010;Netzeband et al, 2010). As the high amplitudes and chaotic character of the pipes above Top Brygge level indicate the presence of gas, and as gas is also present beneath the BPU, we suggest that above Top Brygge level, fluid migration in the GGV is driven by gas rather than mud.…”

Section: Feeder Channelmentioning

confidence: 95%

Seal bypass at the Giant Gjallar Vent (Norwegian Sea): Indications for a new phase of fluid venting at a 56-Ma-old fluid migration system

et al. 2014

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The Giant Gjallar Vent (GGV), located in the Vøring Basin off mid-Norway, is one of the largest (~5 × 3 km) vent systems in the North Atlantic. The vent represents a reactivated former hydrothermal system that formed at about 56 Ma. It is fed by two pipes of 440 m and 480 m diameter that extend from the Lower Eocene section up to the Base Pleistocene Unconformity (BPU). Previous studies based on 3D seismic data differ in their interpretations of the present activity of the GGV, describing the system as buried and as reactivated in the Upper Pliocene. We present a new interpretation of the GGV's reactivation, using high-resolution 2D seismic and Parasound data. Despite the absence of A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 geochemical and hydroacoustic indications for fluid escape into the water column, the GGV appears to be active because of various seismic anomalies which we interpret to indicate the presence of free gas in the subsurface. The anomalies are confined to the Kai Formation beneath the BPU and the overlying Naust Formation, which are interpreted to act as a seal to upward fluid migration. The seal is breached by focused fluid migration at one location where an up to 100 m wide chimney-like anomaly extends from the BPU up to the seafloor. We propose that further overpressure build-up in response to sediment loading and continued gas ascent beneath the BPU will eventually lead to large-scale seal bypass, starting a new phase of venting at the GGV.

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“…High-amplitude reflections and/ or acoustic turbidity tend to disappear gradually or become weaker near the base of the GHSZ (Horozal et al 2009;Netzeband et al 2010). The related seismic anomalies commonly occur beneath concave or convex seafloor expressions on seismic profiles (Ginsburg 1998); these zones are considered to be vertical conduits for fluids, probably migrating from below the GHSZ (Hyndman et al 2001;Wood et al 2002).…”

Section: Introductionmentioning

confidence: 99%

A Two-Dimensional Post-Stack Seismic Inversion for Acoustic Impedance of Gas and Hydrate Bearing Deep-Water Sediments Within the Continental Slope of the Ulleung Basin, East Sea, Korea

Lee¹,

Yoo²,

McMechan³

et al. 2013

Terr. Atmos. Ocean. Sci.

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A post-stack inversion of 2D seismic data was conducted to estimate the spatial distribution of acoustic impedance associated with gas and hydrates in the Ulleung Basin, East Sea, Korea constrained by logs from three boreholes drilled on its continental margin. A model-based inversion was applied to a Plio-Quaternary succession composed of alternations of unconsolidated mass-flow deposits/turbidites. A comparison of seismic reflections and synthetic data computed from impedance logs is shown for two zones. An upper (steep) slope zone contains a moderately continuous, possibly bottom-simulating reflector feature along the corresponding section. This feature may be associated with a lithology boundary near a drill site in addition to, or instead of, a stability boundary of gas hydrates (i.e., gas below and hydrates above). The lower (gentle) slope zone has locally cross-cutting reflection patterns that are more likely to be attributed to gas-and hydrate-related physical phenomena than to spatiotemporal changes in lithology. This seismic inversion is informative and useful, making a contribution to enhance the interpretability of the seismic profiles for a potential hydrate recovery.

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The structures beneath submarine methane seeps: Seismic evidence from Opouawe Bank, Hikurangi Margin, New Zealand

Cited by 48 publications

References 50 publications

Patterns and Sizes of Authigenic Carbonate Formation in the Pliocene Foreland in Southwestern Taiwan: Implications of an Ancient Methane Seep

Patterns and Sizes of Authigenic Carbonate Formation in the Pliocene Foreland in Southwestern Taiwan: Implications of an Ancient Methane Seep

Seal bypass at the Giant Gjallar Vent (Norwegian Sea): Indications for a new phase of fluid venting at a 56-Ma-old fluid migration system

A Two-Dimensional Post-Stack Seismic Inversion for Acoustic Impedance of Gas and Hydrate Bearing Deep-Water Sediments Within the Continental Slope of the Ulleung Basin, East Sea, Korea

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