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Journal of the Geological Society; 1989; v. 146; issue.3; p. 389-392;
DOI: 10.1144/gsjgs.146.3.0389
© 1989 Geological Society of London

Article

Short Paper: Time of docking of the Connemara terrane with the Delaney Dome Formation, western Ireland

P. W. G. TANNER1, T. J. DEMPSTER2 & A. P. DICKIN3

1 Department of Geology, University of Glasgow, Glasgow G12 8QQ, UK
2 Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow G750QU, UK
3 Department of Geology, McMaster University, Hamilton, Ontario, Canada

The Connemara Dalradian terrane was emplaced over the Delaney Dome Formation from the NNW by near orthogonal movement on the Mannin Thrust, a linkage that has survived later movement. Rb-Sr isotopic analyses of micas and whole rocks from the Delaney Dome mylonites constrain the age of movement on the thrust to 447 ±4Ma. This time of thrusting correlates with much other tectonic activity in the Caledonides and may represent a time of ‘docking’ of the Midland Valley block with the more northerly terranes.





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