Factors determining the spatial distribution of gas-charged sediments in the continental shelf off southeastern Korea

Chun, Jong-Hwa; Ryu, Byungki; Lee, Chang Sik; Kim, Young Jun; Choi, Jiyoung; Kang, Nyeon‐Keon; Bahk, Jang-Jun; Kim, Jin Ho; Kim, Kyu Jung; Yoo, Dong‐Geun

doi:10.1016/j.margeo.2012.06.004

Cited by 17 publications

(12 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This suggests abrupt or more gradual variations in acoustic waves velocity, in function of the spatial distribution and concentrations of fluids [73], which is dependent on temperature, pressure, and on the medium permeability [5]. Accumulation of fluids may also have resulted from cross-stratal migration processes, which can occur through faults, intrusive bodies, permeable beds and pipe-like structures [74].…”

Section: Biogenic Gas or Hydrothermal Venting?mentioning

confidence: 99%

“…Channel aggradation processes, local uplift, and inherited topographic features are often triggering factors for a delta lobe to avulse [1,2] and may be directly inferred from facies distribution, lateral extent, and thickness of the deltaic deposits. Furthermore, modern continental shelves offer the opportunity to observe and map the presence of gas in shallow water sediments [3][4][5]. Biogenic methane is frequently produced in deltaic areas where clay-rich sequences are supported with a constant supply of organic matter.…”

Section: Introductionmentioning

confidence: 99%

“…Biogenic methane is frequently produced in deltaic areas where clay-rich sequences are supported with a constant supply of organic matter. Nevertheless, the presence of thermal fluids could also have an effect in decreasing methane solubility, allowing the formation of gas bubbles and fluid-venting structures [5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Coastal Evolution, Hydrothermal Migration Pathways and Soft Deformation along the Campania Continental Shelf (Southern Tyrrhenian Sea): Insights from High-Resolution Seismic Profiles

et al. 2018

View full text Add to dashboard Cite

Abstract:A closely spaced set of high-resolution Chirp-Sonar and Sparker profiles and swath bathymetric data was acquired in 2013 for the I-AMICA Project off the Volturno River mouth (Southern Tyrrhenian Sea) by the Istituto per l'Ambiente Marino Costiero (IAMC), National Research Council of Italy (CNR). The palaeo-topography of three key surfaces, represented by the bounding surfaces of the post-glacial lithosomes, was mapped by the interpolation of seismically detected reflectors. The morphology of the surface related to the Last Glacial Maximum (LGM) regression revealed the presence of fault linkages which defined a small-scale accommodation zone with an E-W trending interbasinal relative high. The observed set of oppositely dipping faults, NNWand ENE-directed, locally controlled the deposition of the paralic/deltaic bodies during the post-glacial rise in sea level, as testified by their wedge-shaped geometries and shifting depocentres. The deformation may be linked to the Campi Flegrei caldera collapse following the Neapolitan Yellow Tuff (NYT) eruption and aged 15 ka BP. The relevant thickness of the Transgressive System Tract (TST) testifies to an increased sediment yield and intense reworking in coastal areas, probably driven by the high volcanoclastic supply during volcanic paroxysm, almost coeval with the post-glacial transgression. Fluid escape features linked to an E-W striking fluid front at the outer shelf suggest the presence of an hydrothermal system controlled by the predominant direction of normal to oblique Quaternary-active faults and by lithologic discontinuities across the sedimentary pile.

show abstract

Section: Biogenic Gas or Hydrothermal Venting?mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Coastal Evolution, Hydrothermal Migration Pathways and Soft Deformation along the Campania Continental Shelf (Southern Tyrrhenian Sea): Insights from High-Resolution Seismic Profiles

et al. 2018

View full text Add to dashboard Cite

show abstract

“…b Magnification of the DMDs, and locations of piston cores (black circles) and chirp seismic track lines (orange dashed lines) mentioned in the text. Blue solid lines Thickness (m) of DMDs (modified from (2.9-4.9) in the DMDs indicate that the organic matter mostly originates from marine phytoplankton (Chun et al 2012). The DMDs typically preserve the highest productivity signal because of the proximity to wind-driven coastal upwelling (Lee et al 2003;Yoo and Park 2009).…”

Section: Geological Settingmentioning

confidence: 99%

“…Thus, multi-channel sparker profiles have revealed that the thickness of the depocenter of the Nakdong subaqueous delta, which is located more than 90 km from the river mouth, is~60 m ). On the other hand, on high-resolution chirp subbottom profiles the internal architecture is commonly obscured due to widespread acoustic blanking of the gas-charged sediment (Lee et al 2005;Chun et al 2012;Kim et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Late Holocene distal mud deposits off the Nakdong delta, SE Korea: evidence for shore-parallel sediment transport in a current-dominated setting

et al. 2015

Self Cite

View full text Add to dashboard Cite

The distal mud deposits (DMDs) off the Nakdong delta represent a subaqueous delta on the inner continental shelf aligned parallel to the southeast coast of Korea and displaying a clinoform geometry. Hydrographically, the coast is characterized by a micro-tidal regime, the strong Korean Coastal Current (KCC) and the East Korean Warm Current (EKWC). Age models and sedimentary facies related to the clinoform geometries are based on high-resolution chirp subbottom profile data and have provided information on shore-parallel sediment transport and accumulation during the late Holocene sea-level highstand. The highest sedimentation rates (6.19-9.17 cm/year) produced steep foresets in the central DMDs at water depths of 35-50 m. Here, vertical burrows are repeatedly truncated by laminated mud packages displaying erosional surfaces. This region represents the main depocenter of the Nakdong subaqueous delta. The topset sediments of the southern DMD at~40 m water depth closer to the river mouth show relatively low sedimentation rates (0.01-0.12 cm/year). Here, the muds have a predominantly mottled character. Similarly, the foreset sediments of the northern DMD at~71-80 m water depth with sedimentation rates of 0.10-2.03 cm/year are also predominantly characterized by mottled muds. The spatial dispersal pattern of the DMDs is consistent with the coast-parallel front between the KCC and EKWC along the southeast Korean coast. In addition, the depocenter of the Nakdong subaqueous delta clinoform is affected by the nearbed turbulence generated by episodic storm events.

show abstract

Field application of 3D CHIRP for geological surveys of shallow coastal regions

Shin

Chun

et al. 2022

Mar Geophys Res

View full text Add to dashboard Cite

Factors determining the spatial distribution of gas-charged sediments in the continental shelf off southeastern Korea

Cited by 17 publications

References 28 publications

Coastal Evolution, Hydrothermal Migration Pathways and Soft Deformation along the Campania Continental Shelf (Southern Tyrrhenian Sea): Insights from High-Resolution Seismic Profiles

Coastal Evolution, Hydrothermal Migration Pathways and Soft Deformation along the Campania Continental Shelf (Southern Tyrrhenian Sea): Insights from High-Resolution Seismic Profiles

Late Holocene distal mud deposits off the Nakdong delta, SE Korea: evidence for shore-parallel sediment transport in a current-dominated setting

Field application of 3D CHIRP for geological surveys of shallow coastal regions

Contact Info

Product

Resources

About