Continent-ocean transition at the western Barents Sea/Svalbard continental margin

Eldholm, Olav; Faleide, Jan Inge; Myhre, Annik M.

doi:10.1130/0091-7613(1987)15<1118:ctatwb>2.0.co;2

Cited by 157 publications

(87 citation statements)

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“…[9] The Greenland Fracture Zone (GFZ) and Senja Fracture Zone (SFZ) formed when Eocene seafloor spreading to the south was translated along the De Geer megashear region between Greenland and Svalbard to the Arctic Ocean [Eldholm et al, 1987;Tsikalas et al, 2002]. However, the GFZ does not resemble a typical oceanic fracture zone and considerable uncertainty exists concerning its plate tectonic origin, age as well as crustal structure and composition of the associated EGR [e.g., Talwani and Eldholm, 1977;Mosar and Opsal, 2002;Tsikalas et al, 2002;Faleide et al, 2001].…”

Section: East Greenland Ridgementioning

confidence: 99%

“…Crustal thinning and translation on the continental margins are thought to have continued to the northeast of the GSFZ prior to opening between the Barents Sea shelf and the NE Greenland offshore crust [Mosar et al, 2002b;Eldholm et al, 1987]. Also, renewed faulting and volcanism is interpreted locally in the Vestbakken Volcanic Province (Figure 1, VVP) in the Oligocene [Faleide et al, 1988].…”

Section: Boreas Basinmentioning

confidence: 99%

“…Because of the discontinuous character of magnetic anomalies to the north of the GSFZ, considerable uncertainty remains regarding crustal compositions within the Boreas Basin [e.g., Talwani and Eldholm, 1977;Vogt, 1986;Mosar and Opsal, 2002;Lundin and Doré, 2002;Tsikalas et al, 2002;Engen et al, 2008]. The basin is generally considered to consist of oceanic crust formed during Chron A23ÀA22 (early Eocene) [Talwani and Eldholm, 1977;Eldholm et al, 1987;Vogt, 1986] or Chron A21 -A18 (middle Eocene) [Engen et al, 2008;Tsikalas et al, 2002;Lundin and Doré, 2002;Mosar et al, 2002b;Mosar and Opsal, 2002]. The plate tectonic model of Mosar et al and Mosar and Opsal further consider the BB as an abandoned spreading domain with an abandoned ridge system, which formed by a ridge jump during Chron A13 (33.3 Ma).…”

Section: Boreas Basinmentioning

confidence: 99%

“…Therefore substantial uncertainty remains concerning the plate tectonic evolution and setting of this area, including the role of the prominent East Greenland Ridge (EGR) (Figure 1). In plate reconstructions, the BB is generally considered to be oceanic crust of Eocene age and younger [e.g., Talwani and Eldholm, 1977;Eldholm et al, 1987;Vogt, 1986;Engen et al, 2006Engen et al, , 2008Tsikalas et al, 2002;Lundin and Doré, 2002;Mosar et al, 2002b]. The EGR, which is situated along the Greenland Fracture Zone (GFZ), is considered as either a normal oceanic fracture zone [Talwani and Eldholm, 1977] or possibly a continental sliver which has been detached from the SW Barents Shelf [Faleide et al, 2001[Faleide et al, , 2004Tsikalas et al, 2002].…”

Section: Introductionmentioning

confidence: 99%

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East Greenland Ridge in the North Atlantic Ocean: An integrated geophysical study of a continental sliver in a boundary transform fault setting

et al. 2008

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The combined Greenland‐Senja Fracture Zones (GSFZ) represent a first‐order plate tectonic feature in the North Atlantic Ocean. The GSFZ defines an abrupt change in the character of magnetic anomalies with well‐defined seafloor spreading anomalies in the Greenland and Norwegian basins to the south but ambiguous and weak magnetic anomalies in the Boreas Basin to the north. Substantial uncertainty exists concerning the plate tectonic evolution of the latter area, including the role of the East Greenland Ridge, which is situated along the Greenland Fracture Zone. In 2002, a combined ocean‐bottom seismometer and multichannel seismic (MCS) survey acquired two intersecting wide‐angle reflection and coincident MCS profiles across and along the East Greenland Ridge. We present the results of integrated reflection seismic interpretation, first‐arrival tomography, 2D kinematic raytracing, full‐wave amplitude modeling, and gravity modeling of the intersecting profiles. The results show that (1) the Greenland Basin is characterized by a normal oceanic crustal velocity structure, (2) the velocity structure of the East Greenland Ridge is of overall continental type, and (3) a major faulted basin province above highly extended continental crust exists to the NE of the ridge. The results further suggest that a zone of extremely thin and faulted continental crust above partially serpentinized mantle peridotite defines the NW edge of the East Greenland Ridge and the transition to the NE Greenland margin.

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Section: East Greenland Ridgementioning

confidence: 99%

Section: Boreas Basinmentioning

confidence: 99%

Section: Boreas Basinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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East Greenland Ridge in the North Atlantic Ocean: An integrated geophysical study of a continental sliver in a boundary transform fault setting

et al. 2008

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“…1 has been given [Rutter, 1995, ]. The ocean-continent transition from the Greenland deep-ocean basin to the shallow Barents Sea continental shelf [Eldholm et al, 1987, ] …”

Section: Introductionmentioning

confidence: 99%

Lateral asthenospheric viscosity variations and postglacial rebound: A case study for the Barents Sea

Kaufmann

1998

Geophysical Research Letters

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Abstract.The effect of lateral asthenospheric viscosity variations on observable signatures related to postglacial rebound in the Barents Sea is studied. Using a finite-element approach to discretize the problem, a comparison between a laterally homogeneous reference earth model and a laterally heterogeneous earth model is performed.The results indicate that a change in asthenospheric viscosity of about three orders of magnitude influences predictions of land uplift up to 10-20 m, present-day velocities up to 0.5-1.5 mm/a, and present-day gravity anomalies up to 0.4 -0.8 mGal in the northwestern part of the Barents Sea region.

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Role of tectonic stress in seepage evolution along the gas hydrate‐charged Vestnesa Ridge, Fram Strait

Plaza‐Faverola

Bünz

Johnson

et al. 2015

Geophysical Research Letters

105

214

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Methane expulsion from the world ocean floor is a broadly observed phenomenon known to be episodic. Yet the processes that modulate seepage remain elusive. In the Arctic offshore west Svalbard, for instance, seepage at 200-400 m water depth may be explained by ocean temperature-controlled gas hydrate instabilities at the shelf break, but additional processes are required to explain seepage in permanently cold waters at depths >1000 m. We discuss the influence of tectonic stress on seepage evolution along the~100 km long hydrate-bearing Vestnesa Ridge in Fram Strait. High-resolution P-Cable 3-D seismic data revealed fine-scale (>10 m width) near-vertical faults and fractures controlling seepage distribution. Gas chimneys record multiple seepage events coinciding with glacial intensification and active faulting. The faults document the influence of nearby tectonic stress fields in seepage evolution along this deepwater gas hydrate system for at least the last~2.7 Ma.

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Continent-ocean transition at the western Barents Sea/Svalbard continental margin

Cited by 157 publications

References 0 publications

East Greenland Ridge in the North Atlantic Ocean: An integrated geophysical study of a continental sliver in a boundary transform fault setting

East Greenland Ridge in the North Atlantic Ocean: An integrated geophysical study of a continental sliver in a boundary transform fault setting

Lateral asthenospheric viscosity variations and postglacial rebound: A case study for the Barents Sea

Role of tectonic stress in seepage evolution along the gas hydrate‐charged Vestnesa Ridge, Fram Strait

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