Formation of pockmarks and submarine canyons associated with dissociation of gas hydrates on the Joetsu Knoll, eastern margin of the Sea of Japan

Nakajima, Takeshi; Kakuwa, Yoshitaka; Yasudomi, Yukihito; Itaki, Takuya; Motoyama, Isao; Tomiyama, Takayuki; Machiyama, Hideaki; Katayama, Hajime; Okitsu, Osamu; Morita, Sumito; Tanahashi, Mamoru; Matsumoto, Ryo

doi:10.1016/j.jseaes.2013.10.011

Cited by 46 publications

(43 citation statements)

References 42 publications

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“…1). Mounds and pockmarks, 50-100 m in diameter, show a linear distribution pattern that is parallel to the axis on the top of the Umitaka Spur and the Joetsu Knoll Nakajima et al 2014). Two-and three-dimensional seismic data obtained from the Umitaka Spur identified seismic blanking that obscured reflectors beneath the mounds and pockmarks, suggesting subsurface gas migration from deep (Saeki et al 2009;Freire et al 2011).…”

Section: Geologic Settingmentioning

confidence: 96%

Physical and thermal properties of mud-dominant sediment from the Joetsu Basin in the eastern margin of the Japan Sea

et al. 2017

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on the sediment mineral composition. Conversely, the grain heat capacity and grain specific heat showed hardly any dependency on the mineral composition. We propose empirical formulae for the relationships between: thermal diffusivity and thermal conductivity, and heat capacity and thermal conductivity for the sediment in the Joetsu Basin. These relationships are different from those for mud-dominant sediment in the eastern flank of the Juan de Fuca Ridge presented in previous work, suggesting a difference in mineral composition, probably mainly in the amount of quartz, between the sediments in that area and the Joetsu Basin. Similar studies in several areas of sediments with various mineral compositions would enhance knowledge of the influence of mineral composition.

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Section: Geologic Settingmentioning

confidence: 96%

Physical and thermal properties of mud-dominant sediment from the Joetsu Basin in the eastern margin of the Japan Sea

et al. 2017

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“…The formation of pockmarks has been associated with several geologic structures as well as geologic processes; these include joints (Hovland and Judd, 1988), faults and faulted anticlines (Chand et al, 2008;Dimitrov and Woodside, 2003), buried channels (Gay et al, 2006a,b), mud diapirs (e.g., Dimitrov and Woodside, 2003;Hovland, 1992), pore water escape (Harrington, 1985;Sun et al, 2011), slumps (Sultan et al, 2004), current and tidal influence (Boe et al, 1998), gas hydrate dissolution and dissociation (Sultan et al, 2010;Nakajima et al, 2014), earthquakes, tsunamis and even human activities (Hovland et al, 2002). The growth of giant pockmarks has been attributed to self-sealing processes and lateral migration of rising fluids (Marcon et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Canyon-confined pockmarks on the western Niger Delta slope

Benjamin

Huuse

Hodgetts

2015

Journal of African Earth Sciences

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“…As a result, several potential hydrocarbon traps, including the Umitaka Spur and the Joetsu Knoll, were formed during this period and continuous subsidence created kitchen areas with mature source rocks (Okui et al . ; Nakajima et al ).…”

Section: Methodsmentioning

confidence: 97%

Correlating biostratigraphy and palaeoceanographic changes during late Quaternary at cold seeps with gas hydrate‐free areas of the Japan Sea using foraminifera paleoecology

et al. 2016

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Late Quaternary foraminifera assemblages have been examined in two sediment cores (MD179‐3296 and MD179‐3317) from cold seep areas in the eastern margin of the Japan Sea, off Joetsu, Niigata Prefecture. Foraminifera assemblages in core MD179‐3296, which was located at the center of a pockmark on the Umitake Spur, show no evidence of methane flux and, especially in its upper portion, share the same paleo‐environmental history as other free gas hydrate areas of the Japan Sea. In comparison, in the core MD179‐3317 at the center of a pockmark at Joetsu Knoll, foraminiferal distributions were strongly affected by methane activities and, in the main part of the core, were deposited under local conditions. Three horizons were identified in this core, which are characterized by the high abundance value of Thalmannammina parkerae and might be related to methane flux due to sea level fall especially through late marine isotope stage (MIS) 3 and MIS 2.

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Formation of pockmarks and submarine canyons associated with dissociation of gas hydrates on the Joetsu Knoll, eastern margin of the Sea of Japan

Cited by 46 publications

References 42 publications

Physical and thermal properties of mud-dominant sediment from the Joetsu Basin in the eastern margin of the Japan Sea

Physical and thermal properties of mud-dominant sediment from the Joetsu Basin in the eastern margin of the Japan Sea

Canyon-confined pockmarks on the western Niger Delta slope

Correlating biostratigraphy and palaeoceanographic changes during late Quaternary at cold seeps with gas hydrate‐free areas of the Japan Sea using foraminifera paleoecology

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