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File:Mylonite (phyllonite) (Rector Branch Mylonite Zone; western Madison County, North Carolina, USA) 1.jpg

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English: Mylonite (phyllonite) from the Late Paleozoic of North Carolina, USA. (foliation plane view; ~18.4 centimeters across at its widest)

Mylonite is a shear metamorphic rock. It forms by intense ductile deformation of rocks in & along fault zones deep in the crust. Several varieties of mylonite have been described in the geologic literature. The example shown above is called phyllonite, which is a mica-rich mylonite with a phyllite-like appearance (www.flickr.com/photos/jsjgeology/16921500082). Phyllonites form by mylonitization of a more coarsely-crystalline precursor rock.

Structural unit & age: Rector Branch Mylonite Zone along the Rector Branch Thrust Fault (Precambrian-aged Spring Creek Gneiss overlying Cambrian-aged Snowbird Formation metasedimentary rocks), southwest of the Hot Springs Window; faulting and mylonitization very likely occurred during the Pennsylvanian-aged Allegheny Orogeny.

Locality: unrecorded site in western Madison County (apparently south or southeast or east of the town of Bluff), western North Carolina, USA
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Source https://www.flickr.com/photos/47445767@N05/26210345091/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/26210345091. 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 20222,744 × 2,616 (3.75 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/26210345091/ with UploadWizard

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