Geology of the Kintail District

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Authors:May, F.; Peacock, J. D.; Smith, D. I.; Barber, A. J.
Author Affiliations:Primary:
British Geological Survey, Edinburgh, United Kingdom
Other:
Royal Holloway and Bedford New College, United Kingdom
Source:75p. Availability: HMSO Publications Centre, London, United Kingdom. ISBN: 0-11-884484-9
Publication Date:1993
Note:In English. 98 refs.
Summary:This sparsely populated area within the Caledonian orogenic belt in the NW Highlands of Scotland is formed chiefly of metamorphosed Moine sediments with numerous occurrences of Lewisian basement on which the Moine sediments were deposited; it is a rugged terrain with several peaks and ridges rising more than 1000 m. The Lewisian north of Loch Duich and in the Glenelg area consists of contrasting W and E facies separated by a zone of extreme deformation. The W facies, composed of migmatite and granodiorite acid gneiss together with remnants of basic intrusions, has been affected by granulite-facies metamorphism and was later cut by basic dykes. The E facies is also partly composed of migmatitic gneiss but also contains metasedimentary rocks; there is isotopic evidence indicating that it was subjected to eclogite-facies metamorphism of Grenville age. The Lewisian metasediments contain forsterite marble and kyanite gneisses, for both of which chemical analyses are tabulated; basic and ultrabasic rocks include eclogites, pyroxenites and amphibolites. The Moine metasediments are described in considerable petrological and structural detail. Late Caledonian igneous activity in early Devonian times is seen in the gabbro to monzonite Ratagain plutonic complex and a variety of minor intrusions; renewed activity of Permo-Carboniferous age produced some 200 camptonite-monchiquite dykes. Some of the phases in the Ratagain complex have remarkably high contents of Sr, Ba and the LREE, resulting in what appears to be unusual primary magmatic occurrences of baryte and celestine in diorite. [R.A.H.]
Subjects:Caledonian Orogeny; Cenozoic; Clastic sediments; Deglaciation; Dikes; Facies; Faults; Folds; Glaciation; Granulite facies; Intrusions; Isoclinal folds; Lewisian; Loch Lomond Stade; Metamorphic rocks; Moraines; Orogenic belts; Paleozoic; Pleistocene; Precambrian; Proterozoic; Quaternary; Sediments; Thrust faults; Till; Upper Pleistocene; Upper Precambrian; Weichselian; Europe; Great Britain; Moine thrust zone; Scotland; Scottish Highlands; United Kingdom; Western Europe; Glenelg Scotland; Kintail Scotland; Loch Duich; Ratagain Complex; Sgurr Beag Slide; Strathconan Fault
Abstract Numbers:94M/2348
Record ID:2000028221
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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