File:Mylonite (Paleozoic; Moine Thrust Zone, Northwest Highlands, Scotland).jpg

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English: Mylonite from the Paleozoic of Scotland. (cross-section view)

Mylonite is a shear metamorphic rock. It forms by intense ductile deformation of rocks in & along shear zones deep in the crust. Several varieties of mylonite have been described in the geologic literature (e.g., protomylonite, mylonite, blastomylonite, ultramylonite, phyllonite). "Ordinary" mylonite has a streaky to banded appearance.

This specimen is from the Moine Thrust Zone in Scotland. Thrust faults are low-angle reverse faults formed by compressional stress. The Moine Thrust developed during the Early to Middle Paleozoic Caledonian Orogeny, a mountain building event. The Caledonian Mountains formed by tectonic collision between the ancient continents of Baltica and Laurentia. Baltica is the Scandinavian paleo-continent (= western Russia + Scandinavia + parts of mainland northern Europe). Laurentia is the North American paleo-continent (= most of North America + Greenland).

Locality: unrecorded/undisclosed site in the Northwest Highlands of northwestern Scotland

Info. at: en.wikipedia.org/wiki/Moine_Thrust_Belt and

en.wikipedia.org/wiki/Mylonite
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Source https://www.flickr.com/photos/47445767@N05/51827818688/
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/51827818688. It was reviewed on 18 January 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

18 January 2022

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current22:49, 18 January 2022Thumbnail for version as of 22:49, 18 January 20222,064 × 1,113 (1.92 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51827818688/ with UploadWizard

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