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File:Rhyolite with fault & fault breccia (Mount Belknap Volcanic Series, Lower Miocene, 18-21 Ma; Marysvale Canyon, Utah, USA) 1.jpg

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English: Rhyolite from the Miocene of Utah, USA.

Rhyolite is a felsic, aphanitic, extrusive igneous rock. If erupted as lava (versus rhyolite ash or tephra from an explosive eruption), rhyolite flows very slowly because it is high-viscosity. Its flow style is sometimes likened to toothpaste oozing from a tube.

This rhyolite sample shows flow banding and flow lineations. The feature from lower left to upper right is a fault. Angular clasts of the host rhyolite are caught up in the fault zone, forming a fault breccia.

Stratigraphy: Mount Belknap Volcanic Series, Lower Miocene, 18-21 Ma

Locality: Marysvale Canyon, far-northern Piute County, southwestern Utah, USA

Reference on the geology of the Mount Belknap & Red Hills volcanic successions:

pubs.usgs.gov/bul/1468/report.pdf
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Source https://www.flickr.com/photos/47445767@N05/50669796868/
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@N05/50669796868. It was reviewed on 2 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

2 December 2020

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current15:39, 2 December 2020Thumbnail for version as of 15:39, 2 December 20203,727 × 2,967 (6.96 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50669796868/ with UploadWizard

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