From pull-apart basins to ultraslow spreading: Results from the western Barents Sea Margin

Libak, Audun; Eide, Christian Haug; Mjelde, Rolf; Keers, Henk; Flüh, Ernst R.

doi:10.1016/j.tecto.2011.09.020

Cited by 21 publications

(20 citation statements)

References 53 publications

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“…This is in accordance with most surrounding oceanic mantle velocities (Breivik et al 2003;Czuba et al 2011;Kandilarov et al 2010;Libak et al 2012;Mjelde et al 2002).…”

Section: Structure Of the Oceanic Crust West Of Vestbakken Volcanic Psupporting

confidence: 89%

“…The thickest crust is found between km 75 and km 120 where the igneous thickness is estimated to 9 km. This is significantly thicker than most of the surrounding oceanic crust (Jackson et al 1990;Kandilarov et al 2010;Klingelhöfer et al 2000;Libak et al 2012). However, Mjelde et al (2002) observed a 7-8 km thick oceanic crust west of the COB on the Senja margin and Kandilarov et al (2010) reported areas with 7-8 km thick oceanic crust on the eastern side of the Knipovich Ridge interpreted as crust accreted at a magmatic dominated spreading segment.…”

Section: Structure Of the Oceanic Crust West Of Vestbakken Volcanic Pmentioning

confidence: 93%

“…5-7 show examples of airgun signals recoded on three different short period OBSs in different parts of the profile. Two other OBS profiles, P-07 (Clark et al 2009) and BIN-2008(Libak et al 2012, were included as constraints for the deeper crustal structure (Fig. 2).…”

Section: Databasementioning

confidence: 99%

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An integrated geophysical study of Vestbakken Volcanic Province, western Barents Sea continental margin, and adjacent oceanic crust

et al. 2012

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“…This is in accordance with most surrounding oceanic mantle velocities (Breivik et al 2003;Czuba et al 2011;Kandilarov et al 2010;Libak et al 2012;Mjelde et al 2002).…”

Section: Structure Of the Oceanic Crust West Of Vestbakken Volcanic Psupporting

confidence: 89%

Section: Structure Of the Oceanic Crust West Of Vestbakken Volcanic Pmentioning

confidence: 93%

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An integrated geophysical study of Vestbakken Volcanic Province, western Barents Sea continental margin, and adjacent oceanic crust

et al. 2012

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“…The margin is usually narrow in this region, domi− nantly affected by shear movements along Hornsund Fault Zone (Ljones et al 2004), but our profile is also influenced by mafic intrusions indicating extension. Similar narrow transition has been documented further to the north (Ritzmann et al 2003(Ritzmann et al , 2004, and to the south (Breivik et al 2003;Libak et al 2012), along the same margin.…”

Section: Geological Interpretationssupporting

confidence: 79%

Seismic and density structure of the lithosphere−asthenosphere system along transect Knipovich Ridge−Spitsbergen−Barents Sea – geological and petrophysical implications

Krysiński¹,

Grad²,

Mjelde³

et al. 2013

Polish Polar Research

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This paper presents a study of the seismic P−wave velocity and density structure of the lithosphere−asthenosphere system along a 800 km long transect extending from the actively spreading Knipovich Ridge, across southern Spitsbergen to the Kong Karls Land Volcanic Province. The 2D seismic and density model documents 6-8 km thick oceanic crust formed at the Knipovich Ridge, a distinct continent−ocean−boundary (COB), the east− ern boundary of the dominantly sheared Hornsund Fault Zone, and the eastern boundary of the Early Cenozoic West Spitsbergen Fold−and−Thrust Belt. The crustal continent−ocean transitional zone has significant excess of density (more than 0.1 g/cm 3 in average), charac− teristic for mafic/ultramafic and high−grade metamorphic rocks. The main Caledonian su− ture zone between Laurentia and Barentsia is interpreted based on variations in crustal thickness, velocities and densities. A high velocity body in the lower crust is preferably in− terpreted in terms of Early Cretaceous magmatism channelled from an Arctic source south− wards along the proto−Hornsund zone of weakness. The continental upper mantle expresses high velocities (8.24 km/s) and densities (3.2 g/cm 3 ), which may be interpreted in terms of low heat−flow and composition dominated by dunites. The lower velocities (7.85 km/s) and densities (3.1 g/cm 3 ) observed in the oceanic lithosphere suggest composition dominated by primitive peridotites. The model of mantle allows for successful direct description of subcrustal masses distribution compensating isostatically uneven crustal load. The esti− mated low value of correlation between density and velocity in the mantle 0.12 kg×s×m −4 suggests that horizontal density differences between oceanic and continental mantle would be dominated by compositional changes.

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“…The uplifted areas provided a major sediment source for the subsiding basins in the southwestern Barents Sea. Late Cretaceous-Paleocene rifting resulted in the formation of pull-apart basins, and finally in break-up of the Norwegian-Greenland Sea (Faleide et al, 1993Libak et al, 2012). The rifting history is also reflected in the subsedimentary configuration in terms of a thinned crystalline crust and lithospheric mantle (Fig.…”

Section: Western Barents Seamentioning

confidence: 99%

A lithosphere-scale structural model of the Barents Sea and Kara Sea region

et al. 2015

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Abstract. We introduce a regional 3-D structural model of the Barents Sea and Kara Sea region which is the first to combine information on the sediments and the crystalline crust as well as the configuration of the lithospheric mantle. Therefore, we have integrated all available geological and geophysical data, including interpreted seismic refraction and reflection data, seismological data, geological maps and previously published 3-D models into one consistent model. This model resolves four major megasequence boundaries (earliest Eocene, mid-Cretaceous, mid-Jurassic and mid-Permian) the top crystalline crust, the Moho and a newly calculated lithosphere-asthenosphere boundary (LAB). The thickness distributions of the corresponding main megasequences delineate five major subdomains (the northern Kara Sea, the southern Kara Sea, the eastern Barents Sea, the western Barents Sea and the oceanic domain comprising the NorwegianGreenland Sea and the Eurasia Basin). Relating the subsidence histories of these subdomains to the structure of the deeper crust and lithosphere sheds new light on possible causative basin forming mechanisms that we discuss.The depth configuration of the newly calculated LAB and the seismic velocity configuration of the upper mantle correlate with the younger history of this region. The western Barents Sea is underlain by a thinned lithosphere (80 km) resulting from multiple Phanerozoic rifting phases and/or the opening of the NE Atlantic from Paleocene/Eocene times on. Notably, the northwestern Barents Sea and Svalbard are underlain by thinnest continental lithosphere (60 km) and a low-velocity/hot upper mantle that correlates spatially with a region where late Cenozoic uplift was strongest. As opposed to this, the eastern Barents Sea is underlain by a thicker lithosphere (∼ 110-150 km) and a high-velocity/density anomaly in the lithospheric mantle. This anomaly, in turn, correlates with an area where only little late Cenozoic uplift/erosion was observed.

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From pull-apart basins to ultraslow spreading: Results from the western Barents Sea Margin

Cited by 21 publications

References 53 publications

An integrated geophysical study of Vestbakken Volcanic Province, western Barents Sea continental margin, and adjacent oceanic crust

An integrated geophysical study of Vestbakken Volcanic Province, western Barents Sea continental margin, and adjacent oceanic crust

Seismic and density structure of the lithosphere−asthenosphere system along transect Knipovich Ridge−Spitsbergen−Barents Sea – geological and petrophysical implications

A lithosphere-scale structural model of the Barents Sea and Kara Sea region

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