Carboniferous (Dinantian and Silesian) and Permo‐Triassic rocks in south County Wexford, Ireland

Clayton, Geoff; Sevastopulo, George D.; Sleeman, A. G.

doi:10.1002/gj.3350210402

Cited by 23 publications

(21 citation statements)

References 5 publications

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“…In the Central Irish Sea Basin, south of the Mid-Irish Sea Uplift, the Namurian section has not been penetrated by exploration wells, but Namurian and Upper Dinantian oil-prone source rocks were found in boreholes in County Wexford (SE Ireland) at the SW end of the basin (Clayton et al 1986). The absence of Namurian section in well 42/17-1 (Maingarm et al 1999) on the flank of the Caledonian Lleyn Ridge, may not be representative of the deeper parts of the basin.…”

Section: Dinantian -Namurianmentioning

confidence: 97%

Hydrocarbon potential of the Kish Bank Basin: integration within a regional model for the Greater Irish Sea Basin

Dunford¹,

Dancer

Long

2001

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The Kish Bank Basin lies in the western Irish Sea c. 20 km east of Dublin. It is one of a number of remnants of a larger Permo-Triassic basin system that may have extended across the whole of the Irish Sea. It has a geological history similar to that of the East Irish Sea Basin, initially developing by the reactivation of Caledonian faults that controlled subsequent deposition during Dinantian and Namurian time, with Westphalian deposition in a sag-basin that overstepped the adjacent basement highs. Variscan dextral transpression resulted in the formation of the Codling and Bray faults, and Permian to Jurassic extension formed a set of north-south-trending faults. Liassic outliers are preserved in the hanging walls of the basin margin faults. Early Cretaceous uplift was followed by chalk deposition.

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Section: Dinantian -Namurianmentioning

confidence: 97%

Hydrocarbon potential of the Kish Bank Basin: integration within a regional model for the Greater Irish Sea Basin

Dunford¹,

Dancer

Long

2001

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“…(1) Permo-Triassic and Liassic sedimentary rocks of the Ulster Basin exposed along the shores of Belfast Lough, the coast of Antrim and penetrated in a number of boreholes in the province, and in the small outliers at Kingscourt, County Cavan (Visscher, 1971) Wexford (Clayton et aL 1986). In these areas, the bulk of the post-Variscan succession is made up of Permo-Triassic red beds (1146m and 1203 m at boreholes near the Antrim coast at Magilligan and Port More, respectively, and 2880 m at Lame 2) (see Fig.…”

Section: The Irish Landmassmentioning

confidence: 99%

The post-Variscan thermal and denudational history of Ireland

Allen

Bennett

Cunningham

et al. 2002

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The thermal and denudational history of Ireland is evaluated using an extensive new apatite fission-track (AFT) dataset derived from surface samples. Modelled thermal histories are used to construct maps of denudation for a number of time slices from Triassic time to 10Ma using a time-dependent palaeogeotherm. The maps illustrate the spatial variability of denudation and subsidence within each time slice. The patterns of denudation are complex, showing considerable variability at the length scale of 101-102km, with especially high denudation rates found over known igneous centres such as the Mournes of County Down. Based on the onshore AFT data alone, there is no definitive signature of an Irish Sea Dome extending significantly across Ireland in Early Tertiary time. The cumulative amount of denudation during Tertiary time varies depending on the AFT annealing model used, but is generally in the region between 1 and 2 km and without clear spatial trends. High amounts of denudation have been mapped over the Tertiary intrusions in County Down, reflecting their unroofing since emplacement in Paleocene time. The cumulative denudation from Triassic time to 10Ma shows relatively low amounts of denudation (<2km) in the Irish Midlands and the extreme NE of the island, consistent with the observation that Mesozoic-Tertiary sediments and igneous products are preserved in the Ulster Basin. The western flank of Ireland and the region between Dublin and County Down show high cumulative amounts of denudation (<4km), the latter being consistent with the high amounts of denudation interpreted for the Irish Sea region. This denudation pattern explains in part the outcrop of Precambrian and Lower Palaeozoic rocks in these areas. The spatial integration of the denudation over the entire landmass gives the average denudation rate and the sediment discharge from Ireland as a function of time. Average denudation rates are moderately high in Triassic time, falling to low values in Cretaceous time, and increasing substantially in Tertiary time. However, the total volumetric discharge of sediment in Tertiary time is an order of magnitude smaller than the preserved solid volume of Tertiary sediment in the basins offshore western Ireland.A comprehensive understanding of the thermal history of Ireland since the end of the Variscan orogeny is hampered by the scarcity of Mesozoic and Cenozoic rocks exposed on the landmass of the island. Post-Carboniferous geological history can be directly evaluated only from the Ulster Basin in the NE of the island, and from small and scattered outcrops throughout the rest of the landmass. In contrast, the offshore basins (Fig. 1) contain a wealth of information on Mesozoic and Cenozoic sedimentation. A general inference is that the present-day Irish landmass has suffered

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“…A red-bed succession of sandstones and conglomerates, more than 200 m thick, was encountered beneath the Quaternary boulder clay in onshore boreholes located within 10km of the coast in the southeast of Ireland (Clayton et al 1986)~ This sequence of red-beds is unfossiliferous, but rests unconformably on Upper Carboniferous strata. Elsewhere, Permo-Triassic data are poorly represented onshore in Ireland, and this remains the only known occurrence of probable Permo-Triassic rocks onshore in the southern part of Ireland (Naylor 1992).…”

Section: Regional Geological Settingmentioning

confidence: 99%

Permo-Triassic development of the Celtic Sea region, offshore Ireland

Shannon¹

1995

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Carboniferous (Dinantian and Silesian) and Permo‐Triassic rocks in south County Wexford, Ireland

Cited by 23 publications

References 5 publications

Hydrocarbon potential of the Kish Bank Basin: integration within a regional model for the Greater Irish Sea Basin

Hydrocarbon potential of the Kish Bank Basin: integration within a regional model for the Greater Irish Sea Basin

The post-Variscan thermal and denudational history of Ireland

Permo-Triassic development of the Celtic Sea region, offshore Ireland

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