Evidence for a "Grenville" event in the Lewisian of northern Outer Hebrides

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doi: 10.1144/gsjgs.146.6.0921
Authors:Cliff, R. A.; Rex, D. C.
Author Affiliations:Primary:
Univ. Leeds, Dep. Earth Sci., Leeds, United Kingdom
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, 146(6), p.921-924. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1989
Note:In English. 26 refs.; illus. incl. 1 table, geol. sketch map
Summary:In the late Proterozoic, northern Britain lay between two areas of major tectonic activity. New Rb/Sr biotite ages for 25 samples from a 50 km traverse through Harris and Lewis show that a block, bounded in the south by the Langavat shear zone, was generally uniformly affected by an event near 1100 m.y. Consideration of the age pattern on either side of the Langavat belt suggests that these were kilometre-scale displacements on this shear zone at this time, involving uplift and erosion of the N Outer Hebrides as a whole, which may thus have acted as a source area for both Laxfordian and 'Grenville' detritus found in the Torridonian. [R.A.H.]
Subjects:Absolute age; Biotite; Dates; Geochronology; Lewisian; Mica group; Precambrian; Proterozoic; Sheet silicates; Silicates; Structural geology; Tectonics; Upper Precambrian; Europe; Great Britain; Hebrides; Outer Hebrides; Scotland; United Kingdom; Western Europe; Langavat Belt
Abstract Numbers:90M/1253
Record ID:1990013275
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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