Seismic stratigraphy of the southern Rockall Basin: a comparison between wide-angle seismic and normal incidence reflection data

Morewood, N. C.; Shannon, Patrick M.; Mackenzie, G. D.

doi:10.1016/j.marpetgeo.2004.07.006

Cited by 15 publications

(15 citation statements)

References 27 publications

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“…The large-scale geometry of the sedimentary succession, based on the velocity structure, is consistent with a series of stacked rift megasequences (Morewood et al 2004). On the margins of the Porcupine Basin such rift strata are imaged clearly on normal-incident seismic data (Croker and Shannon 1987;Naylor et al 2002).…”

Section: Tectono-sedimentary Developmentsupporting

confidence: 61%

“…Normal-incidence seismic reflection data in the Porcupine Basin are typically of very good quality and reveal a wealth of seismic stratigraphic information, especially in the Cenozoic and Cretaceous successions (e.g. Shannon 1992, 1995 new insights into the nature, thickness and development of the crustal structure of the region, as well as providing an accurate picture of the total thickness of the sedimentary succession in the deep-water basins Hauser et al 1995;O'Reilly et al 1996;Mackenzie et al 2002;Morewood et al 2004). …”

Section: Crustal Structurementioning

confidence: 99%

“…The work incorporates the results from recent wide-angle seismic information and from sidescan sonar data (e.g. Morewood et al 2004;O'Reilly et al 2003).…”

Section: Introductionmentioning

confidence: 99%

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The evolution of the Porcupine and Rockall basins, offshore Ireland: the geological template for carbonate mound development

Shannon

McDonnell

Bailey

2006

Int J Earth Sci (Geol Rundsch)

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The margins of the deep-water sedimentary basins west of Ireland contain a number of large clusters (provinces) of spectacular carbonate mounds and build-ups. These basins have a complex development history involving the interplay of rift tectonics, thermal subsidence, igneous activity and oceanographic variations. The Porcupine and Rockall basins both rest upon thin continental crust, the consequence of major rift episodes in Permo-Triassic, Late Jurassic and Early Cretaceous times. Phases of volcanism occurred in the Early Cretaceous and especially in the Early Cenozoic. Fluid flow within the basins is likely to have been controlled by the overall basin geometry and by the distribution and linkage of permeable strata with fault systems, stratal surfaces and unconformities. A number of regional unconformities, controlled by both basin tectonic and regional oceanographic effects, can be mapped and correlated throughout the Porcupine and Rockall basins. The youngest of these unconformities (C10: Early Pliocene) can be traced throughout much of the NW European Atlantic margin. It forms the horizon on which virtually all the carbonate mounds in the basins develop, suggesting a geologically instantaneous mound nucleation and growth event. Although the control on their development is uncertain, the mound clusters show a spatial association with lithified strata, buried contourite and deltaic deposits, slope failure features and with the basin margins. Analysis of these relationships points to a combination of geological and oceanographic processes controlling mound initiation and growth.

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Section: Tectono-sedimentary Developmentsupporting

confidence: 61%

Section: Crustal Structurementioning

confidence: 99%

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The evolution of the Porcupine and Rockall basins, offshore Ireland: the geological template for carbonate mound development

Shannon

McDonnell

Bailey

2006

Int J Earth Sci (Geol Rundsch)

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“…The southern Rockall Basin contains few obvious Cenozoic compressional structures, with the clearest of these lying beneath the central part of the basin (Figs 1 & 2e) (Naylor et al 1999;McDonnell & Shannon 2001;Morewood et al 2004). Resolution is limited by a lack of seismic coverage, but the structure (herein termed the Mid-Rockall Dome) appears to be a NE-trending broad dome underlain by a set of eastwards-dipping late Cretaceousearliest Cenozoic faults.…”

Section: Southern Rockall Hatton and Porcupine Basinsmentioning

confidence: 99%

Controls on the location of compressional deformation on the NW European margin

Kimbell

Stewart

Gradmann

et al. 2016

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The distribution of Cenozoic compressional structures along the NW European margin has been compared with maps of the thickness of the crystalline crust derived from a compilation of seismic refraction interpretations and gravity modelling, and with the distribution of high-velocity lower crust and/or partially serpentinized upper mantle detected by seismic experiments. Only a subset of the mapped compressional structures coincide with areas susceptible to lithospheric weakening as a result of crustal hyperextension and partial serpentinization of the upper mantle. Notably, partially serpentinized upper mantle is well documented beneath the central part of the southern Rockall Basin, but compressional features are sparse in that area. Where compressional structures have formed but the upper mantle is not serpentinized, simple rheological modelling suggests an alternative weakening mechanism involving ductile lower crust and lithospheric decoupling. The presence of pre-existing weak zones (associated with the properties of the gouge and overpressure in fault zones) and local stress magnitude and orientation are important contributing factors.Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.

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“…The thick (0.5 to 1.2 s TWT) sequence between the seismically well-stratified Jurassic strata and the poorly reflective basement is interpreted as a Permo-Triassic succession. In addition to the deep sedimentary section in the Rockall Basin that they interpreted to be of Permo-Triassic age, Morewood et al (2004) speculated that a number of low velocity (approximately 4 km/s), fault-bounded seismic packages, up to 1.5 km thick, identified on wideangle seismic data on the Porcupine High to the east of the Rockall Basin are of possible Permo-Triassic age.…”

Section: Irish Atlantic Margin Basinsmentioning

confidence: 99%

Permo‐Triassic development from Ireland to Norway: basin architecture and regional controls

Štolfová

Shannon

2009

Geological Journal

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Extensive occurrences of Permo‐Triassic strata are preserved along the Northwest European Atlantic margin. Seismic reflection and well data are used to describe large‐scale Permo‐Triassic basin geometries along a swath of the continental shelf more than 2000 km long extending from the Irish to the mid‐Norwegian sectors. Successions in the Celtic Sea, the flanks of the Irish Rockall Basin, basins west and north of Scotland, and the Trøndelag and Horda platforms west of Norway are described. The large‐scale Permo‐Triassic depositional geometries commonly represent erosional remnants of larger basins modified by later rifting episodes, uplift, inversion and continental breakup. However, the interpreted geometries reveal spatial and temporal differences in rifting style. The basins developed above a complex mosaic of petrologically heterogeneous crustal terranes with inherited crustal fabrics, which had a significant impact on the depositional basin geometries. Small Permian basins with growth faulting developed in the southern Celtic Sea region. Extensive, uniformly thick Triassic strata are characteristic of the wide rift basins in the southeastern Rockall Basin and northwest of the Solan Bank High. Thick, fault‐controlled basins developed in the Horda and Trøndelag platform regions. The main controls on Permo‐Triassic basin architecture are (a) crustal thickness and composition, which determined the development of narrow or wide rift basin geometries, (b) inherited Variscan, Caledonian and Precambrian basement structures and (c) pre‐rift palaeotopography. Copyright © 2009 John Wiley & Sons, Ltd.

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Seismic stratigraphy of the southern Rockall Basin: a comparison between wide-angle seismic and normal incidence reflection data

Cited by 15 publications

References 27 publications

The evolution of the Porcupine and Rockall basins, offshore Ireland: the geological template for carbonate mound development

The evolution of the Porcupine and Rockall basins, offshore Ireland: the geological template for carbonate mound development

Controls on the location of compressional deformation on the NW European margin

Permo‐Triassic development from Ireland to Norway: basin architecture and regional controls

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