New evidence of Permo-Triassic rifting, onshore southern Ireland, and its implications for Variscan structural inheritance

Keeley, M. L.

doi:10.1144/gsl.sp.1995.091.01.12

Cited by 3 publications

(1 citation statement)

References 23 publications

(44 reference statements)

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“…Vitrinite reflectance, sonic velocity and apatite fission-track analyses (Maddox et al, 1995) indicate Early Tertiary uplift by 1,000 -2,500 m for the Central Irish Sea Basin. Duncan et al (1998) fission-track analyses (Keeley, 1995). This Early Tertiary regional uplift has been attributed to: (i) reactivation of extensional crustal detachments causing inversion of the preexisting basin (Hillis, 1992); (ii) the presence of a local mantle hotspot beneath the Irish Sea (Cope, 1994); (iii) lithospheric underplating along a NNE-SSW axis, related to the Icelandic plume (Brodie and White, 1995).…”

Section: Cretaceous -Tertiarymentioning

confidence: 99%

Tectonic Evolution of the Southern ‐ Central Irish Sea Basin

Maingarm

Izatt

Whittington

et al. 1999

Journal of Petroleum Geology

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Interpretation of 2D seismic reflection data combined with correlation of five wells in the southern part of the Central Irish Sea Basin show a NE‐SW trending graben, whose bounding faults are considered to be reactivated lineaments of Precambrian age. The basin‐fill comprises mainly Carboniferous and Triassic successions, with localised and thin occurrences of Lower Jurassic and Tertiary rocks, all of which are unconformably overlain by Quaternary sediments. Due to poor data quality, the structural evolution of the area during the Late Palaeozoic is poorly understood. During the Triassic, the basin was subjected to thermal subsidence with a phase of minor uplift in the Anisian. The major phase of extension in the basin took place during the ?Middle ‐ Late Jurassic and had a NW‐SE orientation. Subsequent Late Jurassic sinistral shear along the NE‐SW trending basin bounding fault is suggested to have taken place, giving rise to a series of north‐south intra‐basinal faults. The present‐day structure of the basin is a broad anticline, inherited from a Cretaceous ‐ Early Tertiary compressional phase. During the Palaeocene the area was subjected to regional uplift, followed by minor extension along the NW boundary fault during the Eocene ‐ Oligocene. A Late Tertiary phase of transpression is postulated to have occurred, which inverted north‐south trending faults and folded the base‐Tertiary unconformity.

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Section: Cretaceous -Tertiarymentioning

confidence: 99%

Tectonic Evolution of the Southern ‐ Central Irish Sea Basin

Maingarm

Izatt

Whittington

et al. 1999

Journal of Petroleum Geology

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Diachronous Variscan late-orogenic collapse as a response to multiple detachments: a view from the internides in France to the foreland in the Irish Sea

Praeg

2004

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Models of the collapse of orogenic belts imply diachronous tectonism in which crustal uplift and extension may be compensated by peripheral compression. This first-order prediction is tested against published data on Varsican late-orogenic extensional and compressive structures along a 1500 km transect from the Variscan central internides in France to the foreland in the Irish Sea area. The collapse of the orogen is shown to have expanded northward over time, via three main stages: (i) collapse of the central internides (late Visean-mid-Westphalian, c. 335–310 Ma) — crustal thinning took place by NW-SE extension within a relatively narrow (< 500 km) central axis, accompanied to the north by passive infill of basins spanning a broad seaway inherited from extension during closure of the Rheic Ocean; (ii) reorientation and expansion of collapse (mid-Westphalian-late Stephanian, c. 310–300 Ma) — in the mid-Westphalian, a 90° rotation to NE-SW extension in the central internides was accompanied by changes across the northern internides (episodic basin formation and deformation), the externides (onset of thrust propagation) and the foreland (Westphalian C inversion), while from the early Stephanian, basins began to form in the central internides and expanded to the externides, coeval with final nappe emplacement along the orogenic front; and (iii) collapse of the foreland (late Stephanian-Early Permian, c. 300–290 Ma) — km-scale uplift and erosion of the foreland took place, prior to widespread basin formation in the Early Permian (<290 ± 5 Ma). These three stages are argued to support a model of Variscan late-orogenic collapse in response to three successive detachments of negatively buoyant lithospheric material: of a collisionally thickened orogenic root, and of two (Rheic) oceanic slabs subducted, previously, southward (beneath the orogen) and northward (beneath the foreland). Multiple detachments are a predictable consequence of ocean closure and continental collision, so that episodic collapse may be a common process in the rise and fall of orogenic belts and the tectonic evolution of their forelands.

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The provenance of Middle Jurassic to Cretaceous sediments in the Irish and Celtic Sea Basins: tectonic and environmental controls on sediment sourcing

McCarthy

Fairey

Meere

et al. 2021

JGS

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The Jurassic and Cretaceous sedimentary infill of the Irish and Celtic Sea basins is intimately associated with the breakup of the supercontinent Pangea, and the opening of the Atlantic margin. Previous basin studies have constrained tectonism, basin uplift and sediment composition, but sediment provenance and routing have not received detailed consideration. Current hypotheses for basin infill suggest localised sediment sourcing throughout the Jurassic and Cretaceous, despite a dynamic tectonic and paleoenvironmental history spanning more than 100 million years. We present detrital zircon, white mica and apatite geochronology alongside heavy mineral data from five basins. Findings reveal that basin infill derived predominantly from distal sources with lesser periods of local sourcing. We deduce that tectonically induced marine transgression and regression events had a first-order control on distal versus proximal sedimentary sourcing. Additionally, tectonism which uplifted the Fastnet Basin region during the Middle–Late Jurassic recycled basin sediments into the connected Celtic and Irish Sea Basins. Detrital geochronology and heavy mineral evidence support three distinct provenance switches throughout the Jurassic and Cretaceous in these basins. Overall an integrated multi-proxy provenance approach provides novel insights to tectonic and environmental controls on basin infill as demonstrated in the Irish and Celtic Sea Basins.

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New evidence of Permo-Triassic rifting, onshore southern Ireland, and its implications for Variscan structural inheritance

Cited by 3 publications

References 23 publications

Tectonic Evolution of the Southern ‐ Central Irish Sea Basin

Tectonic Evolution of the Southern ‐ Central Irish Sea Basin

Diachronous Variscan late-orogenic collapse as a response to multiple detachments: a view from the internides in France to the foreland in the Irish Sea

The provenance of Middle Jurassic to Cretaceous sediments in the Irish and Celtic Sea Basins: tectonic and environmental controls on sediment sourcing

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