Rhyolite with fault & fault breccia (Mount Belknap Volcanic Series, Lower Miocene, 18-21 Ma; Marysvale Canyon, Utah, USA) 3

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
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Reference on the geology of the Mount Belknap & Red Hills volcanic successions:
pubs.usgs.gov/bul/1468/report.pdf

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Taken on: November 30, 2020

Tags:

rhyolite

flow

lineation

lineations

Mt.

Mount

Belknap

Volcanic

Series

Volcanics

Marysvale

Canyon

Piute

County

Utah

Miocene

fault

breccia

faults « less

Sets appears in: • Utah Rocks, Minerals, Fossils • Rhyolite & Porphyritic Rhyolite more » • Mount Belknap Volcanic Series (Lower Miocene; Utah, USA) • Miocene Rocks & Fossils • Faults « less

Groups appears in: • Earth Science Teaching Resource • Utah Geology

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