From continental extension to seafloor spreading: crustal structure of the Goban Spur rifted margin, southwest of the UK

Bullock, A.; Minshull, T. A.

doi:10.1111/j.1365-246x.2005.02726.x

Cited by 74 publications

(73 citation statements)

References 88 publications

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“…This interpretation differs from the hypotheses that the Rockall Basin is floored by oceanic crust of mid-Cretaceous age (e.g. Chappell and Kusznir, 2005) or that the Porcupine Abyssal Plain adjacent to Goban Spur margin is underlain by exhumed, serpentinised mantle (Bullock and Minshull, 2005). Measurements of the magnetisation of serpentinised peridotite from exhumed mantle on the Iberian margin indicate values that are significantly less than those for oceanic basalts (Zhao, 1996;Zhao et al, 2001;Russell and Whitmarsh, 2003).…”

Section: Insights From the Pseudogravity Transform In The Porcupine Areacontrasting

confidence: 50%

“…If exhumed mantle occurs within this area we suggest that it may have only limited extent. Such a hypothesis receives some support from the presence of a relative magnetic low which appears to coincide with the anomalous basement identified by Bullock and Minshull (2005) near the western end of the WAM profile (compare their figs. 2a and 9), but further investigation would be necessary to confirm this.…”

Section: Insights From the Pseudogravity Transform In The Porcupine Areamentioning

confidence: 97%

“…The oceanic crust in this region nonetheless still appears to be thinner than the global average of about 7 km, as Thinon et al (2003) cite values of 3-5 km for the oceanic crust off the North Armorican margin to the south. Bullock and Minshull (2005) suggest that exhumed mantle may be present in a c. 70…”

Section: Comparison With Deep Seismic Experimentsmentioning

confidence: 99%

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Three-dimensional gravity and magnetic modelling of the Irish sector of the NE Atlantic margin

2010

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A new 3D lithospheric model has been constructed using high-resolution gravity data from the Irish National Seabed Survey. The sedimentary component of the model incorporated density variations due to laterally varying overcompaction associated with Cenozoic denudation. After optimisation based on gravity inversion, regional crustal thickness variations were defined which are in reasonable agreement with the results of wide-angle seismic experiments. High crustal extension factors (β>5) characterise the deeper parts of the Rockall and Porcupine basins and in places the model indicates extreme stretching (β>10) beneath these basins. This could be because of instability in the gravity inversion, although other recent investigations have independently suggested similarly high extension factors. In contrast, the Hatton Basin is characterised by an apparent extension factor of about 2. The modelling resolves a pattern of NE-to NNE-trending local Mesozoic basins on the margins of the Rockall Trough, helping to delineate structures that were previously only sparsely sampled by seismic surveys. It appears possible that rifts with similar trends underlie the volcanic rocks which obscure the deeper parts of the Hatton Basin. The linear trends of the basins to the south and east of Ireland are interpreted to have been inherited from a basement fabric that was initially established during the late Precambrian assembly of this basement and subsequently subjected to Caledonian and Variscan reactivation. Magnetic modelling indicates that the variations in the thickness of the crystalline crust predicted by the gravity models can explain the regional magnetic anomaly patterns over the Rockall and Porcupine basins, but that significant additional magnetic material (probably igneous rocks of both Palaeogene and Cretaceous ages) is required to explain the anomalies in the Hatton Basin region. The magnetic signature of the Rockall Basin is distinctly different to that over the basement (of similar apparent thickness) formed during mid Cretaceous (C34N) opening of the ocean basin to the south. This is an impediment to hypotheses that invoke mid Cretaceous sea-floor spreading rather than intracontinental rifting to explain the development of the basin. The exception is in the extreme south of the basin where the volcanism associated with the Barra Volcanic Ridges combined with indications of relatively strong lithosphere could be evidence of incipient ocean opening.

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Section: Insights From the Pseudogravity Transform In The Porcupine Areacontrasting

confidence: 50%

Section: Insights From the Pseudogravity Transform In The Porcupine Areamentioning

confidence: 97%

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Three-dimensional gravity and magnetic modelling of the Irish sector of the NE Atlantic margin

2010

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“…Depth ( Barazangi and Brown 1986a,b Barton and White 1997Becker et al 2012Blundell and Raynaud 1986Breivik et al 2003Broucher 1995Bullock and Minshull 2005Chian et al 1995Christeson et al 2008Clegg and England 2003Clowes et al 1999Clowes et al 1987 Pavlenkova et al 2009Prajapati et al 2011Qiu et al 2001Ritzmann et al 2002Roberts et al 1988Rubio et al 2000Sage et al 2000Stankiewicz et al 2008Suckro et al 2012Thréhu et al 1994Tkalcic et al 2011Toomey et al 2007Todd et al 1988Torne et al 2003Vuan et al 2005Wang et al 2004a,b Watremez et al 2011White and McKenzie 1989White and Smith 2009White et al 1987a,b Worthington et al 2012…”

Section: Principal Crustal Typesmentioning

confidence: 97%

Crust and Lithospheric Structure - Global Crustal Structure

Mooney

2015

Treatise on Geophysics

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“…Thinon (1999) suggested the existence of exhumed mantle in the Amorican margin and Bullock & Minshull (2005) for the Goban Spur. Interestingly, deformation structures similar to those observed in the Southern Iberia Abyssal Plain are also described from the NW European Atlantic margins.…”

Section: Characterisation Of the Zone Of Exhumed Continental Mantle Imentioning

confidence: 99%

Compressional structures on the West Iberia rifted margin: controls on their distribution

Péron‐Pinvidic¹,

Manatschal²,

Dean³

et al. 2008

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The West Iberia margin is a magma-poor rifted margin that resulted from Jurassic to Cretaceous polyphase rifting leading to the opening of the North Atlantic Ocean. The Mesozoic rift structures were overprinted by two compressive tectonic events during Eocene and Miocene times resulting from collision between Iberia, Europe and Africa. The effects of these compressive tectonic events are expressed by faults and folds within the post-rift sedimentary sequence. We mapped and studied these Cenozoic deformation structures throughout the Southern Iberia Abyssal Plain (40°–41°N, 11°–13°W) on the basis of an extensive dataset of time migrated seismic profiles acquired by various academic institutions. Acoustic basement has also been analysed on the basis of its seismic aspect, in order to test potential relationships with the distribution of the post-rift sedimentary deformation.Our observations lead to three major conclusions concerning the deformation affecting the post-rift sediments in the Southern Iberia Abyssal Plain: (1) the deformation occurs within the zone of exhumed continental mantle and not at its transition to continental or oceanic crust; (2) it is localized within a zone overlying basement with well-defined seismic characteristics; and (3) it is closely related to the major topographic features observed in the ocean–continent transition. The localization of the deformation within the zone of exhumed continental mantle and not at its boundaries to the adjacent oceanic and continental crust suggests that the limits between the different types of crust are transitional rather than sharp. Our results show that the zone of exhumed continental mantle represents the weakest zone within the margin that is preferentially deformed during initial convergence. At higher convergence rates, this zone may coincide with the location of a future subduction.

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From continental extension to seafloor spreading: crustal structure of the Goban Spur rifted margin, southwest of the UK

Cited by 74 publications

References 88 publications

Three-dimensional gravity and magnetic modelling of the Irish sector of the NE Atlantic margin

Three-dimensional gravity and magnetic modelling of the Irish sector of the NE Atlantic margin

Crust and Lithospheric Structure - Global Crustal Structure

Compressional structures on the West Iberia rifted margin: controls on their distribution

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