Deformational behaviour of migmatites and problems of structural analysis in migmatite terrains

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Authors:McLellan, Eileen
Author Affiliations:Primary:
Yale Univ., Dep. Geol. and Geophys., New Haven, CT, United States
Volume Title:Geological Magazine
Source:Geological Magazine, 121(4), p.339-345. Publisher: Cambridge University Press, London, United Kingdom. ISSN: 0016-7568
Publication Date:1984
Note:In English. 27 refs.; illus. incl. geol. sketch map
Summary:The response of migmatites to deformation is crucial to an interpretation of their structures, and in anatectic and intrusive migmatite terrains due consideration must be given to the modification of deformation processes imposed by melts. In partially molten systems containing more than 30% melt the classical theories of fold formation are inapplicable; the folds produced are of the "viscous fold" type. Their geometry is unpredictable and may mimic structures due to refolding; this is particularly true at very high degrees of melting where flow of melt carrying rafts of solids begins. Failure to distinguish "viscous folds" from the products of refolding will lead to errors in interpreting the structural and metamorphic history of an area.—Modified journal abstract. [C.H.D.]
Subjects:Amphibolite facies; Anatexis; Deformation; Facies; Folds; Grade; Intrusions; Melts; Metamorphic rocks; Metamorphism; Migmatites; Polymetamorphism; Structural analysis; Structural geology; Europe; Grampian Highlands; Great Britain; Scotland; Scottish Highlands; United Kingdom; Western Europe; Viscous fold type
Coordinates:N564000 N573000 W0023000 W0040000
Abstract Numbers:85M/3544
Record ID:1985008826
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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