Timing of deformation associated with the syn-tectonic Dawros-Currywongaun-Doughruagh Complex, NW Connemara, western Ireland

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doi: 10.1144/gsjgs.155.1.0025
Authors:Wellings, S. A.
Author Affiliations:Primary:
57a Blenheim Road, Reading, United Kingdom
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, Vol.155 (Part 1), p.25-37. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1998
Note:In English. 37 refs.; illus., incl. geol. sketch maps
Summary:New data are presented that demonstrate the syn-tectonic intrusion of a suite of mafic and ultramafic magmas into the Connemara Dalradian. Magma was intruded during the local D2 episode but immediately prior to the onset of D3. Both deformation episodes affect the gabbros, forming two distinct groups of fabrics formed at different stages during the history of the intrusion. Applying thermal considerations to this history suggest that any gap in time between the formation of these fabrics was <0.5 Ma. The role played by rigid mafic intrusions in influencing the style of deformation is shown and assessed. The Renvyle-Bofin Slide is reinterpreted as an entirely late-tectonic structure related to extension of the Connemara terrane. The implications of a syn-D2/immediately pre-D3 age of emplacement of these bodies for the age of other gabbros in Connemara is discussed. It is suggested that existing tectonic schemes for the area should be modified: either events in Connemara were highly diachronous or the published ages of the gabbros are misleading.
Subjects:Contact metamorphism; Deformation; Faults; Folds; Igneous rocks; Intrusions; Mafic magmas; Magmas; Magmatism; Metagabbro; Metaigneous rocks; Metamorphic rocks; Metamorphism; Ordovician; Orientation; Paleozoic; Petrology; Plutonic rocks; Regional metamorphism; Shear zones; Syntectonic processes; Tectonic elements; Ultramafics; Connemara; Europe; Galway Ireland; Ireland; Western Europe; Dawros-Currywongaun-Doughruagh Complex; Western Ireland
Coordinates:N531500 N534000 W0090000 W0102000
Abstract Numbers:98M/1882
Record ID:1998031544
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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