Age and structure of the southern Rockall Trough new evidence

Roberts, D.G.; Masson, D.G.; Miles, P. R.

doi:10.1016/0012-821x(81)90214-4

Cited by 74 publications

(29 citation statements)

References 31 publications

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“…Leaving aside any 'fixist' explanations, employing only vertical movements, for the generation of the 'proto North Atlantic' strip of deeply buried crust, we can draw no definite conclusions about its origin, but we can say that it was in existence before the end of the early Cretaceous. This conclusion is based on the stratigraphic evidence from the Faeroe-Shetland Trough discussed above, which we consider to be more trustworthy than that based essentially on correlation and modelling of supposed linear oceanic magnetic anomalies in the southern Rockall Trough, apparently implying a post-Albian phase of spreading (Roberts et al 1981). D. K. Smythe et al…”

Section: O C E a N I C O R S U B S I D E D -C O N T I N E N T A L C Rmentioning

confidence: 92%

Early opening history of the North Atlantic ? I. Structure and origin of the Faeroe?Shetland Escarpment

et al. 1983

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Marine geophysical surveys show that the Escarpment is the buried feather-edge of a thick pile of flood basalts of early Eocene age, overlying a thinner, more widespread layer of basalts of late Palaeocene age. The Escarpment does not, therefore, define the continent-ocean boundary in the southern Norwegian Sea, but instead marks the contemporary shoreline separating terrestrially erupted basalt flows in the north from a restricted shallow-water shelf to the south. The basalts overlie 5-6 km of Mesozoic sediments, which have completely buried a large conical flat-topped seamount of similar dimensions to Anton Dohrn and Rosemary Bank. We call this newly postulated body the Brendan seamount. The Mesozoic sediments are at least as old as early Cretaceous in age, therefore precluding the possibility that the mid-Cretaceous seafloor spreading episode (supposed by some to have created the Rockall Trough) could have also created the thin crust inferred to underlie the Faeroe-Shetland Trough and Mbre Basin.

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Section: O C E a N I C O R S U B S I D E D -C O N T I N E N T A L C Rmentioning

confidence: 92%

Early opening history of the North Atlantic ? I. Structure and origin of the Faeroe?Shetland Escarpment

et al. 1983

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“…The timing is taken to be Early Cretaceous ("Late Kimmerian"), following Megson (1987) and Ziegler (1990), rather than Late Cretaceous, as had been suggested by the interpretation of weak magnetic lineations by Bott (1978) and Roberts et al (1981a).…”

Section: Fragment Rotationsmentioning

confidence: 99%

Alternative global Cretaceous paleogeography

Hay¹,

DeConto²,

Wold³

et al. 1999

Evolution of the Cretaceous Ocean-Climate System

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“…3), several large volcanic seamounts with intrusive centers are present. Within the Rockall Trough, basaltic flows and sills have been mapped seismically as far south as 54 °N to just south of the Wyville-Thomson Ridge (Roberts et al, 1981;Roberts et al, 1983). In the latter area, the lava flows thicken abruptly northward of Rosemary Bank seamount to form the volcanic edifice of the Wyville- Thomson Ridge (Roberts et al, 1983 Talwani and Eldholm (1977).…”

Section: Introductionmentioning

confidence: 99%

Late Paleocene-Eocene Volcanic Events in the Northern North Atlantic Ocean

Roberts¹,

Morton²,

Backman³

1984

Initial Reports of the Deep Sea Drilling Project

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In the North Altantic area, the thick basalts of Greenland, the Faeroes, and Scotland have been widely considered as a single province related to the early Tertiary rifting. The development of this province in time and space has largely remained unknown because of the lack of relevant geological and geophysical data offshore and the uncertainties of chronostratigraphic correlation between widely separated areas.The Leg 81 results allow late Paleocene-Eocene volcanic events in the North Atlantic to be placed in a consistent spatial and temporal framework. The Leg 81 sites demonstrate the volcanic origin of the dipping reflectors and, using their seismically mapped distribution, allow the first definition of the true extent of the volcanic province associated with rifting. Secondly, the more precise stratigraphy established from the Leg 81 data allows a first correlation between events recorded onshore and offshore. The volcanism took place in two phases entirely during the Anomaly 24B/25 reversed polarity interval. The first phase comprised voluminous effusive volcanism (the dipping reflectors) and was succeeded by pyroclastic volcanism, recorded as ash-fall deposits in the Barents Sea, North Sea, Rockall Plateau, and Bay of Biscay, just prior to the onset of spreading in Anomaly-24B time.

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Age and structure of the southern Rockall Trough new evidence

Cited by 74 publications

References 31 publications

Early opening history of the North Atlantic ? I. Structure and origin of the Faeroe?Shetland Escarpment

Early opening history of the North Atlantic ? I. Structure and origin of the Faeroe?Shetland Escarpment

Alternative global Cretaceous paleogeography

Late Paleocene-Eocene Volcanic Events in the Northern North Atlantic Ocean

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