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

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Title: Crustal structure across the More margin, mid-Norway, from wide-angle seismic and gravity data
Authors: Kvarven, Trond Browse this author
Ebbing, Jorg Browse this author
Mjelde, Rolf Browse this author
Faleide, Jan Inge Browse this author
Libak, Audun Browse this author
Thybo, Hans Browse this author
Flueh, Ernst R. Browse this author
Murai, Yoshio Browse this author →KAKEN DB
Keywords: Mere Margin
Ocean bottom seismometers
3D density modeling
Jan Mayen Lineament
Issue Date: 20-Jun-2014
Publisher: Elsevier
Journal Title: Tectonophysics
Volume: 626
Start Page: 21
End Page: 40
Publisher DOI: 10.1016/j.tecto.2014.03.021
Abstract: The More Margin in the NE Atlantic represents a dominantly passive margin with an unusual abrupt transition from alpine morphology 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 More-Trondelag Fault Complex. The modeling of the wide-angle seismic data was performed with a combined inversion and forward modeling 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 More 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 intra-crustal reflector under the Trondelag Platform, but not under the Slorebotn Sub-basin. Furthermore, two lower crustal high-velocity bodies are modeled, one located near the More Marginal High and one beneath the Slorebotn 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 Mayen Lineament, suggesting that the lineament represents a pre-Caledonian structural feature in the basement.
Rights: (C) 2014 Elsevier B.V. All rights reserved.
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 村井 芳夫

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