Formation of gneisses of migmatite and diatexite appearance in Yell, Shetland, by solid-state grain-growth recrystallization

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Authors:Flinn, D.
Author Affiliations:Primary:
University of Liverpool, Department of Earth Sciences, Liverpool, United Kingdom
Volume Title:Controls of metamorphism
Volume Authors:Boyle, A. P.
Source:Geological Journal, 30(3-4), p.415-422; Controls of metamorphism, Liverpool, United Kingdom, Sept. 12-14, 1994, A. P. Boyle. Publisher: Wiley & Sons, Chichester-New York, United Kingdom. ISSN: 0072-1050
Publication Date:1995
Note:In English. 11 refs.; illus., incl. 1 plate, 1 table, geol. sketch map
Summary:Rocks forming Yell are dominantly granoblastic to schistose quartz-feldspathic psammites of greywacke composition, which have been transformed in part to gneisses through recrystallization with the loss of sedimentary laminae, banding and bedding-like partings. Mica-poor granofels has been transformed to a diatexite-like granoblastic paragneiss from its gradation to unaltered metasedimentary rocks. Mica-rich granofels and intercalated mica schists have developed quartzo-feldspathic migmatitic leucosomes. Gneissification by recrystallization occurs patchily throughout the psammite outcrop. It is suggested that grain-growth recrystallization was caused metasomatically by the passage of a fluid through the rock. [R.K.H.]
Subjects:Clastic rocks; Crystal growth; Crystallization; Fluid dynamics; Foliation; Gneisses; Laminations; Metamorphic rocks; Metamorphism; Metasedimentary rocks; Migmatites; Mineral composition; Petrography; Planar bedding structures; Sandstone; Schistosity; Sedimentary rocks; Sedimentary structures; Atlantic Ocean Islands; Europe; Great Britain; Scotland; Shetland Islands; United Kingdom; Western Europe; Diatexites; Yell Island
Coordinates:N600000 N610000 W0010000 W0013000
Abstract Numbers:96M/3754
Record ID:1997052229
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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