The provenance of the Devonian Old Red Sandstone of the Dingle Peninsula, SW Ireland; the earliest record of Laurentian and peri-Gondwanan sediment mixing in Ireland
Posted on 2018-01-09 - 13:16
The Lower Old Red Sandstone in southern Ireland is hosted in the Early Devonian Dingle Basin, which lies immediately south of the Iapetus Suture on the Dingle Peninsula, County Kerry. The basin developed as a post-Caledonian pullapart structure prior to Acadian deformation, which in turn was followed by end-Carboniferous Variscan deformation. Detrital zircon U–Th–Pb geochronology is complemented by mica Ar–Ar and apatite U–Pb geochronology to gain a comprehensive understanding of the provenance of the Lower Devonian Lower Old Red Sandstone of the Dingle Basin and assess contributions of major tectonic components (e.g. Laurentia, Ganderia). Sedimentary rocks in the Lower Old Red Sandstone have similar detrital zircon age distributions, which are dominated by c. 1.2 Ga zircons as well as late Neoproterozoic grains. This indicates a dominant contribution of detritus of Laurentian affinity as well as contributions from westerly and southerly derived Ganderian detritus. Caledonian uplift of the area north of the Iapetus Suture would have facilitated a large contribution of (peri-)Laurentian material. The Upper Old Red Sandstone on the Dingle Peninsula has a distinctly different detrital zircon character including fewlate Neoproterozoic zircons and abundant zircons of c. 1.05 Ga age, indicating sediment derivation only from Laurentia and no recycling from the Lower Old Red Sandstone.
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Fairey, Brenton J.; Kerrison, Aidan; Meere, Patrick A.; Mulchrone, Kieran F.; Hofmann, Mandy; Gärtner, Andreas; et al. (2018). The provenance of the Devonian Old Red Sandstone of the Dingle Peninsula, SW Ireland; the earliest record of Laurentian and peri-Gondwanan sediment mixing in Ireland. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.3971862.v1
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AUTHORS (13)
BF
Brenton J. Fairey
AK
Aidan Kerrison
PM
Patrick A. Meere
KM
Kieran F. Mulchrone
MH
Mandy Hofmann
AG
Andreas Gärtner
BS
Benita-Lisette Sonntag
UL
Ulf Linnemann
KK
Klaudia F. Kuiper
ME
Meg Ennis
CM
Chris Mark
NC
Nathan Cogné
DC
David Chew
CATEGORIES
KEYWORDS
detrital zircon age distributionspost-Caledonian pullapart structureSW1.05 Ga agefewlate Neoproterozoic zirconsDingle PeninsulacontributionIrelanddetrital zircon characterOld Red SandstoneUpper Old Red Sandstoneend-Carboniferous Variscan deformationIapetus Suture1.2 Ga zirconsDevonian Old Red SandstoneDevonian Dingle BasinGeology