File:Mudcracked margin of Artists Paintpots (southwestern pit) (9 August 2013) 2 (12602029113).jpg

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Mudpots, or paintpots, are rare hydrothermal features. At such sites, volcanic gases rise through “mud” - a thick slurry of hot, acidic water mixed with fine-grained clay minerals. The clay minerals formed by chemical decomposition of rhyolite lava flows by naturally-occurring sulfuric acid (H2SO4). The sulfuric acid is the result of oxidation of volcanic hydrogen sulfide gas (H2S). From boreal spring to boreal summer, the viscosity of the mudpots increases. Gases reaching the top surface energetically push hot blobs of mud into the air, sometimes up to 20 feet high.

Artists Paintpots are one of the two best, easily accessible mudpot areas in Yellowstone Park, Wyoming. They are are located at Paintpot Hill in the Gibbon Geyser Basin. The rocks that were decomposed to form the mudpots are Paintpot Hill Dome rhyolites (205,000 to 225,000 years old, upper Middle Pleistocene). Rhyolite is a felsic, aphanitic, extrusive igneous rock - it is a common lithology at Yellowstone, where entire plateaus are composed of Pleistocene-aged rhyolite lavas.
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Source Mudcracked margin of Artists Paintpots (southwestern pit) (9 August 2013) 2
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@N05/12602029113 (archive). It was reviewed on 14 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

14 October 2019

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current02:23, 14 October 2019Thumbnail for version as of 02:23, 14 October 20194,000 × 3,000 (3.2 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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