Timing, controls and consequences of compression in the Rockall-Faroe area of the NE Atlantic Margin

Tuitt, Adrian; Underhill, John R.; Ritchie, J. D.; Johnson, Howard D.; Hitchen, K.

doi:10.1144/0070963

Cited by 23 publications

(37 citation statements)

References 61 publications

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“…Doré & Lundin 1996;Japsen & Chalmers 2000;Lundin & Doré 2002;Ritchie et al 2003;Gomez & Verges 2005;Doré et al 2008;Stoker et al 2010;Tuitt et al 2010;Japsen et al 2012;Yamato et al 2013;Døss-ing et al 2016). Cenozoic compressional domes have been described on the Vøring, Faroe -Shetland and Hatton margins, in the Rockall Basin (for a short summary see Kimbell et al 2016), and in the NE Greenland margin (Price & Whitham 1997;Hamann et al 2005).…”

Section: Subduction In the Pacific And Mediterranean Realms And The mentioning

confidence: 99%

Break-up and seafloor spreading domains in the NE Atlantic

Gaina

Nasuti

Kimbell

et al. 2017

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An updated magnetic anomaly grid of the NE Atlantic and an improved database of magnetic anomaly and fracture zone identifications allow the kinematic history of this region to be revisited. At break-up time, continental rupture occurred parallel to the Mesozoic rift axes in the south, but obliquely to the previous rifting trend in the north, probably due to the proximity of the Iceland plume at 57-54 Ma.The new oceanic lithosphere age grid is based on 30 isochrons (C) from C24n old (53.93 Ma) to C1n old (0.78 Ma), and documents ridge reorganizations in the SE Lofoten Basin, the Jan Mayen Fracture Zone region, in Iceland and offshore Faroe Islands. Updated continent -ocean boundaries, including the Jan Mayen microcontinent, and detailed kinematics of the EocenePresent Greenland-Eurasia relative motions are included in this model.Variations in the subduction regime in the NE Pacific could have caused the sudden northwards motion of Greenland and subsequent Eurekan deformation. These events caused seafloor spreading changes in the neighbouring Labrador Sea and a decrease in spreading rates in the NE Atlantic. Boundaries between major oceanic crustal domains were formed when the European Plate changed its absolute motion direction, probably caused by successive adjustments along its southern boundary.

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Section: Subduction In the Pacific And Mediterranean Realms And The mentioning

confidence: 99%

Break-up and seafloor spreading domains in the NE Atlantic

Gaina

Nasuti

Kimbell

et al. 2017

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“…2c) (Boldreel & Andersen 1998;Johnson et al 2005). Further thinning and growth is recognized in the early Oligocene Tuitt et al 2010), and a series of unconformities indicates a major growth period in the middle Miocene (Fig. 2c) (Boldreel & Andersen 1998;Johnson et al 2005;Stoker et al 2005a, b).…”

Section: Southern Faroe-shetland Basin To the Northern Rockall Basinmentioning

confidence: 92%

“…1), and has an amplitude of up to 1200 m: it was interpreted by Tuitt et al (2010) as originating in the Mid-Eocene. The Onika Anticline trends NNE with an amplitude of 800 m and is inferred to have grown during the Late Eocene (Tuitt et al 2010).…”

Section: Southern Faroe-shetland Basin To the Northern Rockall Basinmentioning

confidence: 99%

“…1) (e.g. Doré et al 2008;Ritchie et al 2008;Tuitt et al 2010), although there is also evidence of earlier compression Tuitt et al 2010;Lundin et al 2013). The aim of this paper is to use results from the NAG-TEC project to examine the relationship between the siting of the post-break-up compressional structures and the morphology and rheology of the margin established as a consequence of the preceding extensional history.…”

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confidence: 99%

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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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“…Extension during that time was generally NW-SE, leading to the initiation of sea floor spreading at ∼55 Ma (Bell and Williamson, 2002), suggesting a NW-SE oriented σ 3 during the emplacement of the Loch Scridain sills. However, the European Atlantic continental margin is host to a suite of structures that accommodated NW-SE contraction during this time, such as anticline-syncline pairs and reverse faults within the adjacent North Rockall Basin, dated to ∼59.2-28.1 Ma (Tuitt et al, 2010), and the NW-SE-striking Mull dykes (Jolly and Sanderson, 1995). Our mechanical models show that the best fit stress state for the sills involves a NW-SE σ 1 , but also favours a radial horizontal compression where φ = 0.75.…”

Section: Causes Of Horizontal Shortening During the Emplacement Of Thmentioning

confidence: 99%

Igneous sills record far-field and near-field stress interactions during volcano construction: Isle of Mull, Scotland

Stephens¹,

Walker²,

Healy³

et al. 2017

Preprint

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Sill emplacement is typically associated with horizontally mechanically layered host rocks in a nearhydrostatic far-field stress state, where contrasting mechanical properties across the layers promote transitions from dykes, or inclined sheets, to sills. We used detailed field observations from the Loch Scridain Sill Complex (Isle of Mull, UK), and mechanical models to show that layering is not always the dominant control on sill emplacement. The studied sills have consistently shallow dips (1 • -25 • ) and cut vertically bedded and foliated metamorphic basement rocks, and horizontally bedded cover sedimentary rocks and lavas. Horizontal and shallowly-dipping fractures in the host rock were intruded with vertical opening in all cases, whilst steeply-dipping discontinuities within the sequence (i.e. vertical fractures and foliation in the basement, and vertical polygonal joints in the lavas) were not intruded during sill emplacement. Mechanical models of slip tendency, dilation tendency, and fracture susceptibility for local and overall sill geometry data, support a radial horizontal compression during sill emplacement. Our models show that dykes and sills across Mull were emplaced during NW-SE horizontal shortening, related to a far-field tectonic stress state. The dykes generally accommodated phases of NE-SW horizontal tectonic extension, whereas the sills record the superposition of the far-field stress with a near-field stress state, imposed by emplacement of the Mull Central Volcano. We show that through detailed geometric characterisation coupled with mechanical modelling, sills may be used as an indication of fluctuations in the paleostress state.

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Timing, controls and consequences of compression in the Rockall-Faroe area of the NE Atlantic Margin

Cited by 23 publications

References 61 publications

Break-up and seafloor spreading domains in the NE Atlantic

Break-up and seafloor spreading domains in the NE Atlantic

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

Igneous sills record far-field and near-field stress interactions during volcano construction: Isle of Mull, Scotland

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