Browsing Bergen Open Research Archive by Author "Mjelde, Rolf"
Now showing items 1-16 of 16
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The Cenozoic western Svalbard margin: sediment geometry and sedimentary processes in an area of ultraslow oceanic spreading
Amundsen, Ingrid Marie Hasle; Blinova, Maria; Hjelstuen, Berit Oline; Mjelde, Rolf; Haflidason, Haflidi (Peer reviewed; Journal article, 2011-04-17)The northeastern high-latitude North Atlantic is characterised by the Bellsund and Isfjorden fans on the continental slope off west Svalbard, the asymmetrical ultraslow Knipovich spreading ridge and a 1,000 m deep rift ... -
Crustal domains in the Western Barents Sea
Shulgin, Alexey A; Faleide, Jan Inge; Mjelde, Rolf; Breivik, Asbjørn Johan; Huismans, Ritske Sipke (Journal article; Peer reviewed, 2021)The crustal architecture of the Barents Sea is still enigmatic due to complex evolution during the Timanian and Caledonian orogeny events, further complicated by several rifting episodes. In this study we present the new ... -
Crustal structure and erosion of the Lofoten/Vesterålen shelf, northern Norwegian margin
Breivik, Asbjørn Johan; Faleide, Jan Inge; Mjelde, Rolf; Flueh, Ernst; Murai, Yoshio (Journal article; Peer reviewed, 2020)The Norwegian continental shelf has been through several rift phases since the Caledonian orogeny. Early Cretaceous rifting created the largest sedimentary basins, and Early Cenozoic continental breakup between East Greenland ... -
Crustal structure and evolution of the Arctic Caledonides: Results fromcontrolled-source seismology
Aarseth, Iselin; Mjelde, Rolf; Breivik, Asbjørn Johan; Minakov, Alexander; Faleide, Jan Inge; Flueh, Ernst R.; Huismans, Ritske (Peer reviewed; Journal article, 2017-10)The continuation of the Caledonides into the Barents Sea has long been a subject of discussion, and two major orientations of the Caledonian deformation fronts have been suggested: NNW-SSE striking and NE-SW striking. A ... -
Crustal structure and origin of the Eggvin Bank west of Jan Mayen, NE Atlantic
Tan, Pingchuan; Breivik, Asbjørn Johan; Trønnes, Reidar G; Mjelde, Rolf; Azuma, Ryosuke; Eide, Sigurd (Peer reviewed; Journal article, 2017-01)The Eggvin Bank, located between the Jan Mayen Island and Greenland, is an unusually shallow area containing several submarine volcanic peaks, confined by two transforms on the Northern Kolbeinsey Ridge (NKR). We represent ... -
The crustal structure in the transition zone between the western and eastern Barents Sea
Shulgin, Alexey A; Mjelde, Rolf; Faleide, Jan Inge; Høy, Tore; Flueh, Ernst; Thybo, Hans (Peer reviewed; Journal article, 2018-07)We present a crustal-scale seismic profile in the Barents Sea based on new data. Wide-angle seismic data were recorded along a 600 km long profile at 38 ocean bottom seismometer and 52 onshore station locations. The modelling ... -
Crustal structure of the ultra-slow spreading Knipovich Ridge, North Atlantic, along a presumed ridge segment center
Kandilarov, Aleksandre; Landa, Hildegunn; Mjelde, Rolf; Pedersen, Rolf Birger; Okino, Kyoko; Murai, Yoshio (Peer reviewed; Journal article, 2010)A combined ocean bottom seismometer, multichannel seismic reflection and gravity study has been carried out along the spreading direction of the Knipovich Ridge over a topographic high that defines a segment center. The ... -
Dynamic Topography Development North of Iceland from Subaerial Exposure of the Igneous Logi Ridge, NE Atlantic
Tan, Pingchuan; Breivik, Asbjørn Johan; Mjelde, Rolf (Peer reviewed; Journal article, 2019)The Logi Ridge, located north of the West Jan Mayen Fracture Zone, is E-W oriented and 140-150 km long. The seafloor surrounding the Logi Ridge is ~0.65 km shallower than the conjugate seafloor east of the Mohn’s Ridge, ... -
Geometries of doleritic intrusions in central Spitsbergen, Svalbard: an integrated study of an onshore-offshore magmatic province with implications for CO2 sequestration
Senger, Kim; Roy, Srikumar; Braathen, Alvar; Buckley, Simon John; Bælum, Karoline; Gernigon, Laurent; Mjelde, Rolf; Noormets, Riko; Ogata, Kei; Olaussen, Snorre; Planke, Sverre; Ruud, Bent Ole; Tveranger, Jan (Peer reviewed; Journal article, 2013)Igneous intrusions emplaced during the Early Cretaceous are well exposed in central Spitsbergen within the Permian–Jurassic sedimentary succession. The doleritic intrusions are collectively classified as the Diabasodden ... -
The influence of magmatic intrusions on diagenetic processes and stress accumulation
Sydnes, Magnhild; Fjeldskaar, Willy; Grunnaleite, Ivar; Løtveit, Ingrid Fjeldskaar; Mjelde, Rolf (Peer reviewed; Journal article, 2019-11-13)Diagenetic changes in sedimentary basins may alter hydrocarbon reservoir quality with respect to porosity and permeability. Basins with magmatic intrusions have specific thermal histories that at time of emplacement and ... -
Marine seismics with a pulsed combustion source and Pseudo Noise codes
Askeland, Bjørn; Hobæk, Halvor; Mjelde, Rolf (Peer reviewed; Journal article, 2007-03)There has been an ongoing debate for years of how dangerous seismic surveys are with respect to marine life. Marine seismics is today dominated by airgun technology, where high energy is generated by a release of compressed ... -
A new tectono-magmatic model for the Lofoten/Vesterålen Margin at the outer limit of the Iceland Plume influence
Breivik, Asbjørn Johan; Faleide, Jan Inge; Mjelde, Rolf; Flueh, Ernst R.; Murai, Yoshio (Peer reviewed; Journal article, 2017-10)The Early Eocene continental breakup was magma-rich and formed part of the North Atlantic Igneous Province. Extrusive and intrusive magmatism was abundant on the continental side, and a thick oceanic crust was produced up ... -
Seafloor expression and shallow structure of a surfacing fold-and-thrust system: an example from Isfjorden, West Spitsbergen
Blinova, Maria; Faleide, Jan Inge; Gabrielsen, Roy H.; Mjelde, Rolf (Peer reviewed; Journal article, 2012)A detailed map of the structure of the West Spitsbergen Fold-and-Thrust Belt in the shallow part of the Isfjorden area, Spitsbergen, is presented. The map was constructed from a new dense grid of 2D multichannel reflection ... -
A seismic field test with a Low level Acoustic Combustion Source and Pseudo Noise codes
Askeland, Bjørn; Ruud, Bent; Hobæk, Halvor; Mjelde, Rolf (Journal article, 2007-01-20)The Low level Acoustic Combustion Source (LACS) is a new type of pulsed underwater acoustic source with an output level of 0.5-1.0 barm peak to peak. The source is based on a combustion engine and intended for shallow ... -
Structure and evolution of the Bellsund Graben between Forlandsundet and Bellsund (Spitsbergen) based on marine seismic data
Blinova, Maria; Thorsen, Rune; Mjelde, Rolf; Faleide, Jan Inge (Peer reviewed; Journal article, 2009)Seismic interpretation of multi-channel seismic data acquired along the western shelf of Spitsbergen allowed identification of the main geological features of the area, including the Hornsund Fault Zone, and the Forlandsundet ... -
Transient thermal effects in sedimentary basins with normal faults and magmatic sill intrusions - a sensitivity study
Sydnes, Magnhild; Fjeldskaar, Willy; Grunnaleite, Ivar; Løtveit, Ingrid Fjeldskaar; Mjelde, Rolf (Journal article; Peer reviewed, 2019-04-05)Magmatic intrusions affect the basin temperature in their vicinity. Faulting and physical properties of the basin may influence the magnitudes of their thermal effects and the potential source rock maturation. We present ...