Detrital U–Pb zircon dating of lower Ordovician syn-arc-continent collision conglomerates in the Irish Caledonides
Date
2008-04-15Author
Clift, Peter D.
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Carter, Andrew
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Draut, Amy E.
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Long, Hoang Van
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Chew, David M.
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Schouten, Hans A.
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https://hdl.handle.net/1912/3132As published
https://doi.org/10.1016/j.tecto.2008.07.018Keyword
Collision; Erosion; Zircon; Caledonides; GrampianAbstract
The Early Ordovician Grampian Orogeny in the British Isles represents a classic
example of collision between an oceanic island arc and a passive continental margin,
starting around 480 Ma. The South Mayo Trough in western Ireland preserves a
complete and well-dated sedimentary record of arc collision. We sampled sandstones
and conglomerates from the Rosroe, Maumtrasna and Derryveeny Formations in
order to assess erosion rates and patterns during and after arc collision. U-Pb dating of
zircons reveals a provenance dominated by erosion from the upper levels of the
Dalradian Supergroup (Southern Highland and Argyll Groups), with up to 20% influx
from the colliding arc into the Rosroe Formation, but only 6% in the Maumtrasna
Formation (~465 Ma). The 24 dominant source regions lay to the northeast (e.g. in the
vicinity of the Ox Mountains, 50 km distant, along strike). The older portions of the
North Mayo Dalradian and its depositional basement (the Annagh Gneiss Complex)
do not appear to have been important sources, while the Connemara Dalradian only
plays a part after 460 Ma, when it supplies the Derryveeny Formation. By this time all
erosion from the arc had effectively ceased and exhumation rates had slowed greatly.
The Irish Grampian Orogeny parallels the modern Taiwan collision in showing little
role for the colliding arc in the production of sediment. Negligible volumes of arc
crust are lost because of erosion during accretion to the continental margin.
Description
Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Tectonophysics 479 (2009): 165-174, doi:10.1016/j.tecto.2008.07.018.
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Suggested Citation
Preprint: Clift, Peter D., Carter, Andrew, Draut, Amy E., Long, Hoang Van, Chew, David M., Schouten, Hans A., "Detrital U–Pb zircon dating of lower Ordovician syn-arc-continent collision conglomerates in the Irish Caledonides", 2008-04-15, https://doi.org/10.1016/j.tecto.2008.07.018, https://hdl.handle.net/1912/3132Related items
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