Crustal structure of the outer Vøring Plateau, offshore Norway, from ocean bottom seismic and gravity data

Mjelde, Rolf; Digranes, P.; Schaack, Mark Van; Shimamura, Hideki; Shiobara, Hajime; Kodaira, Shuichi; Naess, O. E.; Sørenes, N; Vågnes, Erling

doi:10.1029/2000jb900415

Cited by 80 publications

(65 citation statements)

References 34 publications

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“…These features have been observed on the outer Vøring Margin (Mjelde et al, 2001); on the Møre Margin (Olafsson et al, 1992); and on the Rockall Plateau (White et al (1987).…”

Section: Introductionmentioning

confidence: 88%

“…4) illustrate the qualitative differences between various parts of the model. The models are, naturally, better illuminated in the shallower parts depth to the main crustal layers and Moho is estimated to ±0.5 km in areas with very good data quality; ±1.0 km were the data quality is poorer; and ±1.5 km close to the ends of the profiles, whereas the uncertainty for the P-wave velocity is estimated to ±0.05 km/s with very good data quality; ±0.1 km/s where the data quality is poorer; and ±0.15 km/s close to the ends of the profiles (Mjelde et al, 1998;Mjelde et al, 2001;Mjelde et al, 2005;Mjelde et al, 2003;Raum et al, 2002) …”

Section: Uncertainty Resolution and Model Non-uniquenessmentioning

confidence: 99%

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Crustal structure across the Møre margin, mid-Norway, from wide-angle seismic and gravity data

et al. 2014

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The Møre Margin in the NE Atlantic represents a dominantly passive margin with an unusual abrupt transition from high alpine topography onshore to a deep sedimentary basin offshore.In order to study this transition in detail, three ocean bottom seismometer profiles with deep seismic reflection and refraction data were acquired in 2009; two dip-profiles which were extended by land stations, and one tie-profile parallel to the strike of the Møre-Trøndelag Fault Complex. The modelling of the wide-angle seismic data was performed with a combined inversion and forward modelling approach and validated with a 3D-density model.Modeling of the geophysical data indicates the presence of a 12-15 km thick accumulation of sedimentary rocks in the Møre Basin. The modeling of the strike profile located closer to land shows a decrease in crustal velocity from north to south. Near the coast we observe an intracrustal reflector under the Trøndelag Platform, but not under the Slørebotn Sub-basin.Furthermore, two lower crustal high-velocity bodies are modeled, one located near the Møre Marginal High and one beneath the Slørebotn Sub-basin. While the outer lower crustal body is modeled with a density allowing an interpretation as magmatic underplating, the inner body has a density close to mantle density which might suggest an origin as an eclogized body, formed by metamorphosis of lower crustal gabbro during the Caledonian orogeny. The difference in velocity and extent of the lower crustal bodies seems to be controlled by the Jan 2 Mayen Lineament, suggesting that the lineament represents a pre-Caledonian structural feature in the basement.

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“…These features have been observed on the outer Vøring Margin (Mjelde et al, 2001); on the Møre Margin (Olafsson et al, 1992); and on the Rockall Plateau (White et al (1987).…”

Section: Introductionmentioning

confidence: 88%

Section: Uncertainty Resolution and Model Non-uniquenessmentioning

confidence: 99%

Crustal structure across the Møre margin, mid-Norway, from wide-angle seismic and gravity data

et al. 2014

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“…The Vøring Marginal High consists of an outer part of anomalously thick oceanic crust and a landward continental part covered by thick Early Eocene flood-basalts underplated by mafic intrusions (e.g. Skogseid et al, 1992;Mjelde et al, 2001). The boundary between the marginal high and the NE-SW trending Cretaceous Vøring Basin is formed by the Vøring Escarpment, whereas the eastern flank of the basin is dominated by the Late Jurassic-Early Cretaceous Trøndelag Platform (Blystad et al, 1995).…”

Section: Geological Frameworkmentioning

confidence: 99%

Continent–ocean-transitions: Review, and a new tectono-magmatic model of the Vøring Plateau, NE Atlantic

Mjelde

Raum

Murai

et al. 2007

Journal of Geodynamics

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“…Vøring 96 lines 1 -7, 8A, 8B, 9 -14 Mjelde et al (1998Mjelde et al ( , 2001Mjelde et al ( , 2003, Raum (2000), Berndt et al (2001), Raum et al (2002Raum et al ( , 2006. Note: lines 7 and 11 -14 are not labelled on the map (Fig.…”

Section: -112mentioning

confidence: 99%

Moho and basement depth in the NE Atlantic Ocean based on seismic refraction data and receiver functions

Funck

Geissler

Kimbell

et al. 2016

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Seismic refraction data and results from receiver functions were used to compile the depth to the basement and Moho in the NE Atlantic Ocean. For interpolation between the unevenly spaced data points, the kriging technique was used. Free-air gravity data were used as constraints in the kriging process for the basement. That way, structures with little or no seismic coverage are still presented on the basement map, in particular the basins off East Greenland. The rift basins off NW Europe are mapped as a continuous zone with basement depths of between 5 and 15 km. Maximum basement depths off NE Greenland are 8 km, but these are probably underestimated. Plate reconstructions for Chron C24 (c. 54 Ma) suggest that the poorly known Ammassalik Basin off SE Greenland may correlate with the northern termination of the Hatton Basin at the conjugate margin. The most prominent feature on the Moho map is the Greenland-Iceland-Faroe Ridge, with Moho depths .28 km. Crustal thickness is compiled from the Moho and basement depths. The oceanic crust displays an increased thickness close to the volcanic margins affected by the Iceland plume.Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.

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Crustal structure of the outer Vøring Plateau, offshore Norway, from ocean bottom seismic and gravity data

Abstract: The present paper describes the P wave modeling of two 6769

Cited by 80 publications

References 34 publications

Crustal structure across the Møre margin, mid-Norway, from wide-angle seismic and gravity data

Crustal structure across the Møre margin, mid-Norway, from wide-angle seismic and gravity data

Continent–ocean-transitions: Review, and a new tectono-magmatic model of the Vøring Plateau, NE Atlantic

Moho and basement depth in the NE Atlantic Ocean based on seismic refraction data and receiver functions

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