The post-Variscan history of ireland

Naylor, D.

doi:10.1144/gsl.sp.1992.062.01.21

Cited by 23 publications

(28 citation statements)

References 26 publications

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“…As erosion stripped away the cover, the rivers were superimposed on the older underlying structure, and hence inherited a palaeotopography of possible Late Palaeozoic age (Davies, 1960(Davies, , 1970Mitchell, 1980). The cover rocks were most likely Upper Cretaceous limestone (Walsh, 1966;Naylor, 1992), deposited during a time of maximum global sea-level rise (Haq, Hardenbol & Vail, 1987). This hypothesis is partly supported by the widespread occurrences of flint in glacial deposits of southeastern Ireland (Davies, 1970).…”

Section: A Models Of Topographic Development In Southeastern Irelandmentioning

confidence: 99%

“…1a) (Mitchell, 1980;Naylor, 1992). The lowland also features relict granite hills (tors) and abundant granite core-stones (Farrington, 1934).…”

Section: B Problemsmentioning

confidence: 99%

“…Evidence for this includes thermochronological data (Rohrman et al 1995;Rohrman & van der Beek, 1996;Green, Duddy & Bray, 1997;Rowley & White, 1998;Green et al 1999), structural relationships in onshore and offshore basins (e.g. Shannon, 1991;Naylor, 1992;Tate, 1993;Brodie & White, 1995), and coarse clastic sedimentation (Stoker, 1997;Stoker, van Weering & Svaerdborg, 2001). Most of the direct onshore evidence for Cenozoic tectonic deformation in Ireland is based on the displacement of Upper Cretaceous chalk, Paleocene basalt flows and Oligocene sequences in the northeast of the country (Parnell, Shukla & † Author for correspondence: mcunningham@rocketmail.com Meighan, 1988;Naylor, 1992;Geoffroy, Bergerat & Angelier, 1996).…”

Section: Introductionmentioning

confidence: 99%

“…Shannon, 1991;Naylor, 1992;Tate, 1993;Brodie & White, 1995), and coarse clastic sedimentation (Stoker, 1997;Stoker, van Weering & Svaerdborg, 2001). Most of the direct onshore evidence for Cenozoic tectonic deformation in Ireland is based on the displacement of Upper Cretaceous chalk, Paleocene basalt flows and Oligocene sequences in the northeast of the country (Parnell, Shukla & † Author for correspondence: mcunningham@rocketmail.com Meighan, 1988;Naylor, 1992;Geoffroy, Bergerat & Angelier, 1996). However, little is known about the Cenozoic tectonic history outside this region due to an absence of stratigraphic resolution (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…However, little is known about the Cenozoic tectonic history outside this region due to an absence of stratigraphic resolution (e.g. Naylor, 1992;Allen et al 2002).…”

Section: Introductionmentioning

confidence: 99%

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Evidence for post-early Eocene tectonic activity in southeastern Ireland

et al. 2003

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract -The role played by Cenozoic deformation in denudation and landscape development in Ireland has historically been difficult to assess because of the lack of widespread pre-glacial Cenozoic deposits onshore. Here we combine analysis of apatite fission-track data and geomorphic observations to place constraints on the timing, kinematics and magnitude of onshore deformation in southeastern Ireland. Relationships between apatite fission-track central age and elevation for samples from the Wicklow and Blackstairs Mountains and Tullow Lowland suggest that these rocks record an exhumed apatite partial annealing zone, which after cooling was dismembered by differential vertical displacements of up to several hundred metres. We use inverted models of sample thermal history to show that samples across the region experienced very similar thermal histories up to and including a cooling event in late Paleocene or early Eocene time. This effectively rules out strongly spatially heterogeneous denudation, and implies that differential rock uplift occurred in post-early Eocene time.The central age-elevation relationships define at least three spatial domains with internally consistent apatite fission-track data, separated by known faults or topographic escarpments. Geomorphic analysis of these structures shows that patterns of catchment incision and sinuosity, as well as the presence of antecedent drainage, are best explained by differential vertical displacements at or near the domain boundaries. The kinematics and magnitudes of these displacements are consistent with those implied by the apatite fission-track results, and are compatible with other examples of known Cenozoic deformation from Ireland and the adjacent continental margin.

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Section: A Models Of Topographic Development In Southeastern Irelandmentioning

confidence: 99%

“…1a) (Mitchell, 1980;Naylor, 1992). The lowland also features relict granite hills (tors) and abundant granite core-stones (Farrington, 1934).…”

Section: B Problemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…However, little is known about the Cenozoic tectonic history outside this region due to an absence of stratigraphic resolution (e.g. Naylor, 1992;Allen et al 2002).…”

Section: Introductionmentioning

confidence: 99%

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Evidence for post-early Eocene tectonic activity in southeastern Ireland

et al. 2003

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The genesis of gold mineralisation hosted by orogenic belts: A lead isotope investigation of Irish gold deposits

et al. 2014

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Lead isotope analyses have been performed on 109 gold and 23 sulphide samples from 34 Irish gold occurrences, including 27 placers, and used to shed light on the sources of mineralising fluids and metals associated with gold mineralisation hosted by orogenic belts. The Pb isotope ratios of lode and placer gold range from 206 Pb/ 204 Pb = 17. 287-18.679, 207 Pb/ 204 and 208 Pb/ 204 Pb = 37.517-38.635, consistent with the Pb isotopic data on previously reported Irish sulphide mineralisation. There is no evidence that gold mineralisation is associated with distinctive source regions, and it appears to have been derived from similar sources to those responsible for the widespread sulphide mineralisation in Ireland. It is inferred that the principal controls on the Au mineralisation are structural and not related to the distribution of Au in their source rocks. The range of Pb isotope ratios favours the interaction of multiple source reservoirs predominantly during the Caledonian Orogeny (c.475-380 Ma). Underlying basement was the primary control on two key sources of Pb. Gold occurrences located to the south-east of the Iapetus Suture are characterised by Pb compositions that derive predominantly from the Late Proterozoic crustal basement or overlying Lower Palaeozoic sediments, whilst those located north-west of the Iapetus Suture are characterised by less radiogenic Pb signatures derived predominantly from Late Proterozoic or older crustal basement. A third source, relatively enriched in radiogenic Pb, also played a role in the formation of a number of Irish gold occurrences, and may have been associated with syn-to postorogenic intrusives. Magmatic processes may therefore have played an important role in the formation of some gold occurrences located in orogenic settings.

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Diagenetic contrast of sandstones in hydrocarbon prospective Mesozoic rift basins (Ethiopia, UK, USA)

Wolela

2014

Journal of African Earth Sciences

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The post-Variscan history of ireland

Cited by 23 publications

References 26 publications

Evidence for post-early Eocene tectonic activity in southeastern Ireland

Evidence for post-early Eocene tectonic activity in southeastern Ireland

The genesis of gold mineralisation hosted by orogenic belts: A lead isotope investigation of Irish gold deposits

Diagenetic contrast of sandstones in hydrocarbon prospective Mesozoic rift basins (Ethiopia, UK, USA)

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