Reaction softening in mylonites from the Arnaboll Thrust, Sutherland

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doi: 10.1144/sjg19020157
Authors:Dixon, J.; Williams, G.
Author Affiliations:Primary:
Univ. Coll., Dep. Geol., Cardiff CF11XL, United Kingdom
Volume Title:Scottish Journal of Geology
Source:Scottish Journal of Geology, 19(2), p.157-168. Publisher: Scottish Academic Press, Edinburgh, United Kingdom. ISSN: 0036-9276
Publication Date:1983
Note:In English. 1 p. refs.; illus. incl. 3 anal., 3 tables, sketch map, geol. sketch map
Summary:These mylonites in NW Scotland show considerable evidence of having been produced as a result of reaction softening or reaction-enhanced ductility. An originally coarse-grained granitic Lewisian gneiss has been degraded to an extremely fine-grained mylonite; the grain-size reduction is related to increasing strain and was accompanied by both mineralogical and chemical change. The feldspar is replaced by a fine-grained muscovite-quartz assemblage; chemical analyses suggest that this change is related to the addition and removal of material during shear deformation along this ductile shear zone. This has aided the reaction softening process or possible superplastic behaviour in the highest strain ultramylonites. [R.A.H.]
Subjects:Faults; Gneisses; Grain size; Metamorphic rocks; Mylonites; Overthrust faults; Shear zones; Strain; Structural analysis; Structural geology; Europe; Great Britain; Highland region Scotland; Northern Highlands; Scotland; Sutherland Scotland; United Kingdom; Western Europe
Abstract Numbers:84M/1119
Record ID:1986006503
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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