Deep structure and origin of the Faeroe — Shetland Channel

Bott, M. H. P.

doi:10.1007/978-94-009-5626-1_25

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…It is not proved that the low-velocity layer beneath the Lower Basalt Series consists of sediments but minor gas and oil shows in the lava sequence in the Lopra-1 well indicate the presence, at a deeper level, of marine sediments with an organic content (Jacobsen and Laier 1984). The suggested marine sediments could perhaps continue into the Faeroe Basin where Bott (1984) has observed a similar layer. All the lava flows drilled in the Lopra-1 well are described as subaerial and so have subsided at least 2000 m since the eruption of the basalt.…”

Section: Stratigraphy Of the Basalt Formation And Sedimentary Successmentioning

confidence: 83%

“…Mesozoic sediments west of the subsided rift basins (Bott 1984;Mudge and Rashid 1987) have not been confirmed by drilling. However, in the bottom of Well 163-6/1 (northern Rockall Trough) approximately 200 m of Paleocene cordierite bearing dacites was found .…”

Section: Faeroe Shetland Channel and Rockall Troughmentioning

confidence: 98%

“…The origin and age of the Faeroe Shetland Channel and the Rockall Trough has been debated, but unequivocal evidence either for the crustal nature or for the age has not been presented. Seafloor spreading as a cause of the origin of the Faeroe Shetland Channel and Rockall Trough has been suggested from plate tectonic reconstructions, from the crustal thickness and the lack of fault blocks dipping away from the margin (Bott 1984;Ha'szeldine 1984). Others have suggested that the Faeroe Shetland Channel and Rockall Trough were created by rifting of continental crust, based on the velocity structure in the Rockall Trough (Roberts et al 1988;Neish 1990).…”

Section: Faeroe Shetland Channel and Rockall Troughmentioning

confidence: 99%

“…The escarpments along the southern part of the ridge were suggested to be due to post-lava faulting. Bott (1984) proposed that the topography of the Wyville Thomson Ridge represented later volcanic loading on a belt of otherwise uniform oceanic crust. Both models are in general accordance with the free air gravity and magnetic data but do not account for the observed nearly parallel-bedded reflectors in the volcanics or for the observed compression along the ridge axis.…”

Section: Late Paleocene-recent Tectonic Evolution Of Rockall Trough Amentioning

confidence: 99%

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Late Paleocene to Miocene compression in the Faeroe–Rockall area

Boldreel

Andersen

1993

PGC

114

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Compressional structures are observed at several locations in the Faeroe-Rockall Area. One of these, the Wyville-Thomson Ridge Complex, is part of the Scotland Greenland Ridge which forms a barrier to the south-flowing deep cold arctic water from the Norwegian Sea. Interpretation of seismic multichannel reflection profiles suggests that the Wyville-Thomson Ridge Complex is the result of compression and that the Ymir Ridge and the Wyville-Thomson Ridge are ramp anticlines connected with a fault plane dipping to the north. A number of small highs offset by reverse faults to the south of the complex are interpreted as foreland thrust folds developed in relation to the tectonic evolution of the ridge complex. At least three Eocene to Miocene compressional phases are recognized. The first took place in late Paleocene-early Eocene and the second in Oligocene times. These compressional phases coincide with pronounced changes in the sea floor spreading geometry in the NE Atlantic. The third phase, in the middle or late Miocene, may possibly be associated with the complex Miocene spreading history of Iceland. I 1 0 100 Km Fig. 1. Bathymetric sketch map of the Faeroe-Rockall area (contour interval of 250 m) and the four major tectonic provinces discussed in the text. Location of the seismic sections A to E in Figs 4-8 is also shown.

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Section: Stratigraphy Of the Basalt Formation And Sedimentary Successmentioning

confidence: 83%

Section: Faeroe Shetland Channel and Rockall Troughmentioning

confidence: 98%

Section: Faeroe Shetland Channel and Rockall Troughmentioning

confidence: 99%

Section: Late Paleocene-recent Tectonic Evolution Of Rockall Trough Amentioning

confidence: 99%

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Late Paleocene to Miocene compression in the Faeroe–Rockall area

Boldreel

Andersen

1993

PGC

114

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“…2a) forms part of a NE/SWtrending basin system dominated by extension and subsidence during Cretaceous times (Earle et al 1989;Duindam and van Hoorn 1987;Mudge and Rashid 1987). It is considered to be underlain by thinned continental lithosphere (Mudge and Rashid 1987) and is flanked by the relatively unthinned continental crust of the Shetland and Faeroe platforms (Bott 1984). The continent/ocean boundary lies further to the west, on the far side of the Faeroe Islands (Bott 1984 the basin, especially along the Rona Ridge which divides the basin into two (Fig.…”

Section: Late Cretaceous and Tertiary Subsidence In The Faeroe-shetlamentioning

confidence: 99%

Subsidence patterns in western margin basins: evidence from the Faeroe–Shetland Basin

Turner

Scrutton

1993

PGC

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Anomalously high rates of Paleocene tectonic subsidence have been documented from a number of basins on the NW European continental shelf. This period of accelerated subsidence occurs during what is conventionally regarded as the post-rift phase of basin development. It cannot, therefore, be explained by theoretical models of basin formation in which the post-rift subsidence is driven only by the decay of the thermal anomaly generated during active extension. The Faeroe-Shetland Basin developed as a major Cretaceous depocentre, with Late Cretaceous times in particular characterized by extremely high rates of tectonic subsidence. Subsidence rates on the flanks of the basin slowed dramatically into Paleocene times as a major mid-Paleocene unconformity developed across the eastern side of the basin. Wells from the basin centre, on the other hand, show extremely high and accelerating rates of Late Paleocene subsidence associated with normal faulting. These high rates of observed tectonic subsidence lasted for less than 5 Ma and cannot easily be explained in terms of fluctuations in sediment supply rates or eustatic sea-level. This simultaneous flank uplift and basin centre subsidence acceleration is the same age as both the anomalous Paleocene subsidence reported from other nearby basins, and the oldest magmatism associated with the proto-Icelandic plume. Subsidence behaviour returned to normal, across the entire basin, at the same time as continental break-up was achieved between Greenland and Northwest Europe. This suggests that there is a link between regional tectonics and the anomalous Paleocene subsidence patterns observed in this and other basins on the NW European continental shelf.

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3D seismic analysis of the West Shetland Drift system: Implications for Late Neogene palaeoceanography of the NE Atlantic

Hohbein

Cartwright

2006

Marine Geology

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Deep structure and origin of the Faeroe — Shetland Channel

Cited by 10 publications

References 14 publications

Late Paleocene to Miocene compression in the Faeroe–Rockall area

Late Paleocene to Miocene compression in the Faeroe–Rockall area

Subsidence patterns in western margin basins: evidence from the Faeroe–Shetland Basin

3D seismic analysis of the West Shetland Drift system: Implications for Late Neogene palaeoceanography of the NE Atlantic

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