A crustal model for a northeast-southwest profile through Ireland

Jacob, A. W. B.; Kaminski, W.; Murphy, T.; Phillips, W. E. A.; Prodehl, C.

doi:10.1016/0040-1951(85)90111-8

Cited by 60 publications

(33 citation statements)

References 14 publications

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“…The Irish continental shelf and many of the basins therein have been the focus of seismic reflection, seismic refraction and potential field investigations for several decades (Holder & Bott 1971;Whitmarsh et al 1974;Bunch 1979;Jacob et al 1985;Makris et al 1988;Roberts et al 1988;Lowe & Jacob 1989;O'Reilly et al 1991O'Reilly et al , 1995O'Reilly et al , 2010Vogt et al 1998;Landes et al 2000Landes et al , 2003Morewood et al 2005;Hauser et al 2008). Coupled with sparse well control, the resulting studies have allowed for the piecing together of the detailed tectonostratigraphic basin evolution of the margin (Shannon 1991;Naylor & Shannon 2009.…”

Section: The Irish Atlantic Marginmentioning

confidence: 98%

Comparison of lithosphere structure across the Orphan Basin–Flemish Cap and Irish Atlantic conjugate continental margins from constrained 3D gravity inversions

Welford

Shannon

O’Reilly

et al. 2012

JGS

127

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Regionally constrained 3D gravity inversion results on the Orphan Basin-Flemish Cap and the Irish Atlantic conjugate continental margins are compared to investigate crustal structure, early rifting history and geological evolution of this part of the North Atlantic. The full-crustal density anomaly distributions provide some of the first depth images of how rifted structures compare along and across these conjugate margins. Broad similarities in crustal structure are identified with some noticeable differences, linked to rifting and crustal stretching processes. Extreme crustal thinning (stretching factors >3.5) is indicated beneath much of the southern Porcupine Basin, the western half of West Orphan Basin, the eastern half of Jeanne d'Arc Basin, the southeastern half of East Orphan Basin and in pockets beneath Rockall Basin. This appears to have resulted in the serpentinization (and possible exhumation) of mantle lithosphere on the Irish Atlantic and Flemish Cap margins but not beneath Orphan Basin. A simple evolution model is proposed for the early stages of rifting between the margins. It is suggested that ancient orogenic sutures played an important role in controlling the northward migration of rifting and the rotation and displacement of Flemish Cap out of Orphan Basin.Supplementary material: Enlarged maps from this paper are available at www.geolsoc.org.uk/SUP18527.

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Section: The Irish Atlantic Marginmentioning

confidence: 98%

Comparison of lithosphere structure across the Orphan Basin–Flemish Cap and Irish Atlantic conjugate continental margins from constrained 3D gravity inversions

Welford

Shannon

O’Reilly

et al. 2012

JGS

127

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“…Such estimates are available for all the modelled sections, generally based on an original crustal thickness of 30 km (e.g. Jacob et al, 1985;Lowe and Jacob, 1989). The total magnitude of stretching is the cumulative result of the multiple extensional episodes that have affected the NW European margin since the late Palaeozoic (e.g.…”

Section: Input Parametersmentioning

confidence: 99%

Anomalous Cenozoic subsidence along the ‘passive’ continental margin from Ireland to mid-Norway

Ceramicola¹,

Stoker²,

Praeg³

et al. 2005

Marine and Petroleum Geology

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“…Hauser et al (1995) and O'Reilly et al (1996) observed that the slow stretching rates necessary to explain hyperextension without magmatism were most easily explained by a differential stretching model in which the upper and middle crust were more extended than the lower crust and upper mantle. This interpretation was supported by a comparison between the three-layer velocity model for adjacent, unstretched crust (Jacob et al 1985;Lowe & Jacob 1989) and the velocity structure observed beneath the central part of the basin. …”

Section: Southern Rockall Basinmentioning

confidence: 66%

“…A reference value of 30 km is estimated around Britain and Ireland on the basis of observed crustal thicknesses in areas where topography lies close to sea level and Mesozoic basins are absent (e.g. Jacob et al 1985;Lowe & Jacob 1989). In the Norwegian sector, larger crustal thicknesses have been detected in the coastal region (e.g.…”

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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A crustal model for a northeast-southwest profile through Ireland

Cited by 60 publications

References 14 publications

Comparison of lithosphere structure across the Orphan Basin–Flemish Cap and Irish Atlantic conjugate continental margins from constrained 3D gravity inversions

Comparison of lithosphere structure across the Orphan Basin–Flemish Cap and Irish Atlantic conjugate continental margins from constrained 3D gravity inversions

Anomalous Cenozoic subsidence along the ‘passive’ continental margin from Ireland to mid-Norway

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

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