Exploration of the Norwegian Shelf

Rønnevik, Hans; Eggen, S; Vollset, J.

doi:10.1144/gsl.sp.1983.012.01.10

Cited by 12 publications

(2 citation statements)

References 1 publication

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“…4,5). Note that the Bodri high includes a sharp synclinal feature, earlier named the Rrist Syncline (Remnevik et al, 1983;Beten et al, 1984) and the Rrist Sub-basin , along its entire length. Also note that the term Molde high was first used by Hamar and Hjelle (1984) to describe a dome mapped by Hinz et al (1982).…”

Section: Outer V0ring Basin Inner V0ring Basinmentioning

confidence: 94%

Vøring Plateau Continental Margin: Seismic Interpretation, Stratigraphy, and Vertical Movements

Skogseid¹,

Eldholm²

1989

Proceedings of the Ocean Drilling Program

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Seismic mapping tied to drilling data has provided a depositional, structural, and volcanic framework that describes the Wring Plateau continental margin since Late Jurassic time. The Vdring Basin was structured by Late Jurassic-Early Cretaceous extension and subsequent subsidence in the Cretaceous. It is divided into two basin provinces by the Molde-Bodd high. The opening of the Norwegian-Greenland Sea during the early Tertiary was preceded by uplift of the outer Wring Basin accompanied by extensional listric faulting in the Cretaceous sediments and intrusive activity. The early Tertiary extension was restricted to the outer Wring Basin, subsequently forming the Tertiary marginal basin. The igne ous activity is also restricted to this basin, gradually approaching the Wring Plateau Escarpment toward the time of breakup. Initial subaerial sea-floor spreading created the upper volcanic series at ODP Site 642, parts of the flow-sill complex landward of the escarpment and also caused deposition of ashes and tuffs in the Wring Basin. The post-open ing margin history is characterized by the progressive submergence of the Wring Plateau marginal high which for long periods was elevated with respect to the Wring Basin. The southern marginal high became fully sediment covered dur ing the early Miocene, whereas the northern part was not covered before the Pliocene. The basal sediments are of terrig enous origin, partly derived from erosion of the exposed lavas. Off the summit, a change to hemipelagic and pelagic compositions took place during the middle and late Eocene. The overall sediment record at the high is characterized by local erosion, redeposition, and instabilities. We propose that early Tertiary strike-slip motion, which triggered mass movements lasting into the early Miocene, is responsible for the spectacular north-south domes in the Wring Basin. Fi nally, a renewed major pulse of sedimentation and subsidence centered on the shelf edge commenced in latest Miocene time.

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Section: Outer V0ring Basin Inner V0ring Basinmentioning

confidence: 94%

Vøring Plateau Continental Margin: Seismic Interpretation, Stratigraphy, and Vertical Movements

Skogseid¹,

Eldholm²

1989

Proceedings of the Ocean Drilling Program

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“…Since Devonian a number of extension episodes have been documented; Late Carboniferous-Early Permian regional rifting, mid-to Late Triassic block faulting and Late Triassic-Early Jurassic growth faulting with detachment in Triassic evaporates (BUKOVICS et al, 1984;SURLYK et al, 1984;ZIEGLER, 1988;SKOGSEID et al, 1992). The Late Jurassic-Early Cretaceous extension lead to major faulting activity, generally creating slightly rotated fault blocks and causing subsequent subsidence along rift systems (BO * EN et al, 1984;HINZ et al, 1984;MUTTER, 1984;RO )NNEVIK et al, 1983;SKOGSEID and ELDHOLM, 1989;MOKHTARI, 1991). The final major extensional episode occurred during the Maastrichtian-Palaeocene time, and led to continental separation at the PalaeoceneEocene boundary (SKOGSEID et al, 1992).…”

Section: Geological Backgroundmentioning

confidence: 99%

Structure of a Volcanic Continental Margin Derived from Ocean-bottom Seismographic Data: The Northern Vøring Margin, off Norway

Kodaira

Mjelde

Shiobara

et al. 1998

Pure appl. geophys.

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This paper presents a crustal model derived from an Ocean Bottom Seismograph (OBS) study along the northern Vo *ring margin off Norway. The profile was acquired to map the crustal structure in the northernmost part of the Vo *ring Basin, and to link crustal models of the Lofoten and central Vo *ring Basin obtained by previous OBS studies. The Vo *ring margin, as well as the Lofoten margin to the north, was created by continental breakup between Norway and Greenland in late Paleocene-early Eocene. The rifting and continental breakup process were accompanied by intense extrusive and intrusive magmatic activities. The OBS data provide the whole crustal structure along the northern Vo *ring margin, in the area where the deep crustal structure cannot be resolved by conventional multichannel reflection data due to sill intrusions in the sedimentary sequence. The shallow part of the crustal model is characterized by up to 10 km thick sediments, a sequence of flood basalts and sill intrusions. The P-wave velocities in the flood basalts and sill intrusions are estimated to 5.0 km/s and 4.7-5.8 km/s, respectively. The model indicates an abrupt thickening of the upper crystalline crust from 3 km in the NE, to about 10 km towards the SE, with velocities of 6.0-6.2 km/s. The lower crustal velocities are not well resolved due to lack of clear refraction arrivals from the lower crust. However, the observed amplitude versus offsets are best explained by a model with a change in lower crustal velocities from 6.8 to 7.2 km/s beneath the Bivrost lineament. The modelling infers the presence of a lower crustal reflector beneath the lineament, which represents the landward continuation of the Bivrost lineament. Reflection arrivals from the Moho reveal a Moho depth of 23 km in the middle of the profile and 18-20 km in the northeastern part of the profile. A 370 km long crustal section from the central part of the Vo *ring Basin to the Lofoten margin, obtained by the results of this study and previous OBS studies, shows a simple thinned continental crust on the Lofoten margin, and a high velocity lower crust underlying an upper crust of varying thickness in the Vo *ring Basin. The transition between these structures is situated beneath the Bivrost lineament in the lower crust, and beneath the basement high about 40 km south of the lineament in the upper crust.

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Tectonic inhomogeneities of the Kristiansund—Bodø Fault Complex, offshore mid-Norway

Gabrielsen¹,

Robinson²

1984

Petroleum Geology of the North European Margin

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Exploration of the Norwegian Shelf

Cited by 12 publications

References 1 publication

Vøring Plateau Continental Margin: Seismic Interpretation, Stratigraphy, and Vertical Movements

Vøring Plateau Continental Margin: Seismic Interpretation, Stratigraphy, and Vertical Movements

Structure of a Volcanic Continental Margin Derived from Ocean-bottom Seismographic Data: The Northern Vøring Margin, off Norway

Tectonic inhomogeneities of the Kristiansund—Bodø Fault Complex, offshore mid-Norway

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