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Journal of the Geological Society; 2005; v. 162; issue.3; p. 563-575;
DOI: 10.1144/0016-784904-067
© 2005 Geological Society of London

Original Article

470 Ma granitoid magmatism associated with the Grampian Orogeny in the Slishwood Division, NW Ireland

MichaelJ. Flowerdew1,2, J.Stephen Daly3 & MartinJ. Whitehouse1

1 1Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden
2 2Present address: British Antarctic Survey, c/o NERC Isotope Geosciences Laboratory, Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK (e-mail: mf@bas.ac.uk)
3 3Department of Geology, University College Dublin, Belfield, Dublin 4, Ireland

Ion-microprobe U–Pb zircon geochronology demonstrates that magmatic rocks that cut the Slishwood Division are early Ordovician in age and relate to the earliest stages of the Grampian Orogeny. These tonalite and granite intrusions yield ages of 474 ± 5 Ma, 472 ± 6 Ma, 471 ± 5 Ma and 467 ± 6 Ma. A Sm–Nd mineral isochron of 457 ± 36 Ma confirms an Ordovician age for one of the tonalite bodies and demonstrates that they were affected by Ordovician metamorphism whereas biotite Rb–Sr mineral ages from two of the tonalite bodies show that the Slishwood Division had cooled below c. 350 °C at 449 ± 7 Ma. The early orogenic tonalite and granite intrusions are mylonitized in structures that overthrust the Dalradian Supergroup onto the Slishwood Division during major nappe formation and, thus, date the onset of such deformation at or before 471 ± 5 Ma, the age of the youngest intrusion where such field relations can be demonstrated.


Keywords: Dalradian, Caledonides, absolute age, zircon, granite.




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