Constraints on early sinistral displacements along the Great Glen Fault Zone, Scotland; structural setting, U-Pb geochronology and emplacement of the syn-tectonic Clunes Tonalite

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doi: 10.1144/jgs.158.5.821
Authors:Stewart, M.; Strachan, R. A.; Martin, M. W.; Holdsworth, R. E.
Author Affiliations:Primary:
Oxford Brookes University, Geology (BMS), Oxford, United Kingdom
Other:
University or Durham, United Kingdom
Massachusetts Institute of Technology, United States
Liverpool John Moores University, United Kingdom
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, Vol.158(Part 5), p.821-830. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:2001
Note:In English. 42 refs.
Summary:Current tectonic models emphasize the role of crustal-scale transcurrent faults in controlling the ascent and emplacement of plutons in orogenic belts. The Clunes Tonalite crops out adjacent to the transcurrent Great Glen Fault Zone within the Ordovician-Silurian Caledonian orogenic belt of Scotland. The tonalite is characterized by a strong fabric defined by aligned plagioclase, hornblende and biotite that is interpreted to be a magmatic state deformation fabric formed during emplacement. Field and microstructural evidence derived from the tonalite and its Moine Supergroup country rocks supports an emplacement model that links intrusion directly to early sinistral displacements along the Great Glen Fault Zone. U-Pb zircon geochronology yields a crystallization age for the Clunes Tonalite of 427.8±1.9 Ma. The age is thus interpreted to date early sinistral displacements along the Great Glen Fault Zone and is identical within error to that of the Ratagain granite emplaced during sinistral displacement along the Strathconon Fault to the NW.
Sections:Petrology
Subsections:General
Subjects:Absolute age; Dates; Diorites; Displacements; Emplacement; Fault zones; Faults; Igneous rocks; Lateral faults; Left-lateral faults; Models; Paleozoic; Plutonic rocks; Silurian; Syntectonic processes; Tectonics; Tonalite; U/Pb; Europe; Great Britain; Great Glen Fault; Highland region Scotland; Inverness-shire Scotland; Scotland; United Kingdom; Western Europe; Clunes Tonalite
Coordinates:N564000 N580000 W0033000 W0073000
Abstract Numbers:02M/905
Record ID:2002002093
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
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