Norway — Svalbard Continental Margin: Structural and Stratigraphical Styles

Myhre, Annik M.; Eldholm, Olav; Faleide, Jan Inge; Skogseid, Jakob; Guðlaugsson, Steinar Þór; Stuevold, Liv M.; Vågnes, Erling

doi:10.1007/978-1-4684-6500-6_7

Cited by 15 publications

(9 citation statements)

References 56 publications

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“…Hot spot location (double circle) according to White and McKenzie (1989). Eldholm (1977) and Nunns (1983); and summaries of the margin geology have been presented by Roberts et al (1984), Myhre et al (1992) and Larsen (1990) for Hatton Bank, Norway-Svalbard and East Greenland margins, respectively. The post-opening history includes the following.…”

Section: North Atlantic Tectonic Episodesmentioning

confidence: 99%

“…In fact, an important spatial evolution of the rift zones has been documented on the Norwegian-Greenland Sea margins, where the location of rifts and subsequent basin development have shifted through time but generally stayed within the Caledonian deformation belt (Skogseid et al 1992;Faleide et al 1992). Therefore, the successful continental break-up and formation of the Nor-wegian-Greenland Sea took place in a region characterized by late Paleozoic and early Mesozoic extension and crustal thinning.…”

Section: North Atlantic Tectonic Episodesmentioning

confidence: 99%

“…3. North Atlantic-Arctic plate reconstructions (Myhre et al 1992) (a) Break-up during chron 24R near the Paleocene-Eocene transition. Note the predominantly rifted plate boundary in the south, and the sheared plate boundary in the north, (b) Chron 13, early Oligocene time.…”

Section: North Atlantic Tectonic Episodesmentioning

confidence: 99%

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Evolution of North Atlantic volcanic continental margins

Hinz

Eldholm

Block

et al. 1993

PGC

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Structurally, the North Atlantic margins are characterized by Late Cretaceous-Early Tertiary extension, developing predominantly rifted segments south of the Greenland-Senja Fracture Zone, and by oblique extension and wrenching leading to large sheared margin segments further north. The rifted segments document an intense, transient volcanic phase during break-up, emplacing huge extrusive constructions on the outer margin. Commercial exploration has mostly been landward of the shelf edge, but lately there is increased interest in the deep water basins on the outer margins and in the perennially sea-ice-covered shelf off Greenland. Evaluation of these areas requires an understanding of the processes and events prior, during and after the Paleocene-Eocene opening of the North Atlantic. Although the margin is a Cenozoic feature, its segmentation and evolution are governed by the pre-opening history, particularly the Late Jurassic-Early Cretaceous tectonic episode which resulted in large Cretaceous sedimentary basins. Moreover, the first few multi-channel seismic profiles from the NE Greenland inner shelf north of 79°N show a deep Permo-Carboniferous rift basin. The similarity of tectono-magmatic features off NE Greenland and Norway shows the value that conjugate margin studies provide in understanding volcanic margin formation. The events at break-up affected both the subsidence and thermal histories of the marginal basins and were associated with crustal uplift and erosion of the rift region, intrusive activity within the adjacent Mesozoic basins and lava flows spilling onto large areas of the pre-opening crust. The transient magmatism/volcanism had important environmental implications. After break-up, the margin experienced thermal subsidence and little structural deformation, but the extrusive complexes controlled the Paleogene sediment deposition.

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Section: North Atlantic Tectonic Episodesmentioning

confidence: 99%

Section: North Atlantic Tectonic Episodesmentioning

confidence: 99%

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Evolution of North Atlantic volcanic continental margins

Hinz

Eldholm

Block

et al. 1993

PGC

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“…Rifting of the Yermak/Morris Jesup Plateaus was the necessary first step in offering a more open flow into and out of the Arctic Basin and is likely to have marked the tectonic linkage of spreading in the Arctic Ocean with that in the Norwegian-Greenland Sea (Talwani and Eldholm, 1977;Rona and Richardson, 1978;Myhre et al, 1992). Clearance of the edge of the European continental plate at ~15 Ma as it moved past northeastern Greenland left only the Yermak Plateau blocking the passage to deepwater flow between the Norwegian Sea and the Arctic Ocean.…”

Section: Tc Moore and The Expedition 302 Scientists Sedimentation Amentioning

confidence: 99%

Sedimentation and subsidence history of the Lomonosov Ridge

Moore¹

2006

Proceedings of the IODP 302

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“…1). The drill site is located on crust that formed during symmetric seafloor spreading along the Myhre et al, 1992. Mohns Ridge, beginning in approximately Anomaly 24B time (53-55 Ma; Talwani and Eldholm, 1977;Eldholm and Thiede, 1980). Hole 913B yielded a thick succession of brightly colored, laminated biosilica-rich clays and oozes, composed of diatoms, radiolarians, silicoflagellates, and dinoflagellates.…”

Section: Introductionmentioning

confidence: 99%

Paleoceanography and Biostratigraphy of Paleogene Radiolarians from the Norwegian-Greenland Sea

Hull¹

1996

Proceedings of the Ocean Drilling Program

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Eocene and Oligocene radiolarians were recovered from two sites on Ocean Drilling Program (ODP) Leg 151. Early Oligocene to early late Oligocene radiolarians have been extracted from material cored at Site 908 on the Hovgàrd Ridge (Fram Strait). Although rare and only moderately preserved, these assemblages represent the northernmost occurrence of radiolarians recovered by either the Deep Sea Drilling Project or ODP thus far. Site 913 on the East Greenland margin has yielded a sequence of moderately diverse middle Eocene to earliest Oligocene radiolarians. In total, -75 species have been documented herein from both sites.Previous radiolarian biostratigraphies developed for the Norwegian-Greenland Sea were used as an initial basis for Leg 151 age dating. However, complications introduced by Leg 38 spot-coring techniques and radiolarian endemism are highlighted by Site 913 material that does not fit easily into either of the previous biostratigraphic zonations proposed for this region. Consequently, age determinations are based in part on comparison of Site 913 with Leg 38 sites as well as calibration of radiolarian events with other microfossil groups (diatoms, silicoflagellates, and dinoflagellates) present in Hole 913B. The combined stratigraphies suggest the presence of the Eocene/Oligocene boundary in the uppermost part of the biosiliceous sequence at Site 913. The uppermost part of this interval is characterized by the dominance of robust radiolarian groups, broken radiolarian tests, rare diatoms and increased reworking of radiolarians and dinoflagellates. These changes are interpreted as evidence for increased bottomwater circulation associated with radiolarian blooms at or just above the Eocene/Oligocene boundary. These findings concur with previous studies indicating increased bottomwater circulation in the North Atlantic during this same period of geologic time.

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Norway — Svalbard Continental Margin: Structural and Stratigraphical Styles

Cited by 15 publications

References 56 publications

Evolution of North Atlantic volcanic continental margins

Evolution of North Atlantic volcanic continental margins

Sedimentation and subsidence history of the Lomonosov Ridge

Paleoceanography and Biostratigraphy of Paleogene Radiolarians from the Norwegian-Greenland Sea

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