Investigations of the East Greenland continental margin between 70° and 72° N by deep seismic sounding and gravity studies

Weigel, W.; Flüh, Ernst R.; Miller, Heinrich; Butzke, A.; Dehghani, G. A.; Gebhardt, V.; Harder, I.; Hepper, J.; Jokat, Wilfried; Kläschen, Dirk; Kreymann, S.; Schüβler, S.; Zhao, Zhidan

doi:10.1007/bf01203425

Cited by 52 publications

(82 citation statements)

References 23 publications

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“…6e) has a maximum thickness of 3 km (Hermann & Jokat 2016). Thicker sedimentary basins along this margin segment are found onshore Greenland where seismic refraction data indicate a depth of 15 km for the Jameson Land Basin (Weigel et al 1995). Larsen & Marcussen (1992) suggested that the basin infill there might even be up to 18 km thick.…”

Section: Ne Greenland Continental Marginmentioning

confidence: 99%

“…This could either suggest that the rather poorly constrained HVLC on the Greenland side is not real or that such a layer was missed in the model of the western JMMC. On the Greenland side, there is at least one other line in support for a thin HVLC (Weigel et al 1995), but the wide-angle seismic constraints are also very poor. At the western margin of the JMMC, 4 kmthick continental crust lies adjacent to 9 km-thick oceanic crust (Kodaira et al 1998a).…”

Section: Ne Greenland Continental Marginmentioning

confidence: 99%

“…10a) is constrained by JMKR-95 line 3 (Kodaira et al 1998a) and OBS 2000 line 8 . On the Greenland side, line ARK 1988-3 (Weigel et al 1995) is perfectly conjugate to these two lines, but has a rather poor resolution owing to a curved line geometry and a limited number of receivers in the offshore segment of the line. Hence, lines AWI 94340 and 20090100 (Hermann & Jokat 2016) are chosen instead to illustrate this conjugate margin pair (Fig.…”

Section: Conjugate Transects North Of Icelandmentioning

confidence: 99%

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A review of the NE Atlantic conjugate margins based on seismic refraction data

Funck

Gaina

Geissler

et al. 2016

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The NE Atlantic region evolved through several rift episodes, leading to break-up in the Eocene that was associated with voluminous magmatism along the conjugate margins of East Greenland and NW Europe. Existing seismic refraction data provide good constraints on the overall tectonic development of the margins, despite data gaps at the NE Greenland shear margin and the southern Jan Mayen microcontinent. The maximum thickness of the initial oceanic crust is 40 km at the Greenland-Iceland-Faroe Ridge, but decreases with increasing distance to the Iceland plume. High-velocity lower crust interpreted as magmatic underplating or sill intrusions is observed along most margins but disappears north of the East Greenland Ridge and the Lofoten margin, with the exception of the Vestbakken Volcanic Province at the SW Barents Sea margin. South of the narrow Lofoten margin, the European side is characterized by wide margins. The opposite trend is seen in Greenland, with a wide margin in the NE and narrow margins elsewhere. The thin crust beneath the basins is generally underlain by rocks with velocities of .7 km s 21 interpreted as serpentinized mantle in the Porcupine and southern Rockall basins; while off Norway, alternative interpretations such as eclogite bodies and underplating are also discussed.Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.

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Section: Ne Greenland Continental Marginmentioning

confidence: 99%

Section: Ne Greenland Continental Marginmentioning

confidence: 99%

Section: Conjugate Transects North Of Icelandmentioning

confidence: 99%

See 1 more Smart Citation

A review of the NE Atlantic conjugate margins based on seismic refraction data

Funck

Gaina

Geissler

et al. 2016

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“…High velocity lower crust and anomalously thick oceanic crust is observed off East Greenland conjugate to the Jan Mayen microcontinent (e.g. Weigel et al 1995;Voss et al 2009). However, the oceanic crust is associated with the second breakup event (see age grids and magnetic spreading anomalies of Gaina et al (2016)).…”

Section: Spatial Distribution Of Volcanismmentioning

confidence: 99%

“…Mathiesen et al (2000) estimate that 2 km of basaltic lava flows covered the Jameson Land Basin and were subsequently eroded away. High velocity lower crust observed by Weigel et al (1995) could be the intrusive counterpart to the eroded basalts. In that case, 5-6 km of intrusive rocks are unaccounted for in the volume estimates here.…”

Section: Spatial Distribution Of Volcanismmentioning

confidence: 99%

Regional distribution of volcanism within the North Atlantic Igneous Province

Horni

Hopper

Blischke

et al. 2017

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An overview of the distribution of volcanic facies units was compiled over the North Atlantic region. The new maps establish the pattern of volcanism associated with breakup and the initiation of seafloor spreading over the main part of the North Atlantic Igneous Province (NAIP). The maps include new analysis of the Faroe-Shetlands region that allows for a consistent volcanic facies map to be constructed over the entire eastern margin of the North Atlantic for the first time. A key result is that the various conjugate margin segments show a number of asymmetric patterns that are interpreted to result in part from pre-existing crustal and lithospheric structures. The compilation further shows that while the lateral extent of volcanism extends equally far to the south of the Iceland hot spot as it does to the north, the volume of material emplaced to the south is nearly double of that to the north. This suggests that a possible southward deflection of the Iceland mantle plume is a long-lived phenomenon originating during or shortly after impact of the plume.

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Origin and evolution of the Kolbeinsey Ridge and Iceland Plateau, N-Atlantic

Brandsdóttír

Hooft

Mjelde

et al. 2015

Geochem. Geophys. Geosyst.

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Variations in crustal structure along the 700 km long KRISE7 refraction/reflection and gravity profile, straddling 66.5 N across the Iceland Shelf, Iceland Plateau and western Norway Basin confirm that extinct spreading centers coexisted with the now extinct AEgir Ridge prior to the initiation of the Kolbeinsey Ridge at 26 Ma. The western 300 km of the profile, across the Iceland shelf, formed by rifting at the Kolbeinsey Ridge, whereas the eastern 400 km, across the Iceland Plateau and the western Norway Basin, formed by earlier rifting, possibly containing slivers of older oceanic or continental crust rifted off the central EGreenland margin along with the Jan Mayen Ridge. Crustal thickness increases gradually across the Iceland shelf, from 12 to 13 km near the Kolbeinsey Ridge to 24-28 km near the eastern shelf edge, decreasing abruptly across the shelf edge, to 12-13 km. The Iceland Plateau has crustal thickness ranging from 12 to 15 km decreasing to 5-8 km across the western Norway Basin and 4-5 km at the AEgir Ridge. We suggest that high-velocity lower crustal domes and corresponding gravity highs across the Iceland plateau mark the location of extinct rift axes that coexisted with the AEgir Ridge. Similar lower crustal domes are associated with the currently active rift segments within Iceland and the Kolbeinsey Ridge.

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Investigations of the East Greenland continental margin between 70° and 72° N by deep seismic sounding and gravity studies

Cited by 52 publications

References 23 publications

A review of the NE Atlantic conjugate margins based on seismic refraction data

A review of the NE Atlantic conjugate margins based on seismic refraction data

Regional distribution of volcanism within the North Atlantic Igneous Province

Origin and evolution of the Kolbeinsey Ridge and Iceland Plateau, N-Atlantic

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