File:Rhyolite (Paleocene-Eocene, 52-59 Ma; Big Butte, Butte, Montana, USA) 2.jpg
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| Description |
English: Rhyolite in the Tertiary of Montana, USA.
The town of Butte, Montana is known as the “Richest Hill on Earth” and "The Mining City". The Butte Mining District has produced gold, silver, copper, molybdenum, manganese, and other metals. The area's bedrock consists of the Butte Quartz Monzonite (a.k.a. Butte Pluton), which is part of the Boulder Batholith. The Butte Quartz Monzonite ("BQM") formed 76.3 million years ago, during the mid-Campanian Stage in the Late Cretaceous. BQM rocks have been intruded and altered by hydrothermal veins containing valuable metallic minerals - principally copper sulfides. The copper mineralization has been dated to 62-66 million years ago, during the latest Maastrichtian Stage (latest Cretaceous) and Danian Stage (Early Paleocene). In the supergene enrichment zone of the area, the original sulfide mineralogy has been altered. In addition to quartz monzonite, the Butte area's bedrock also includes rhyolite, in the form of lava flows, shallow intrusions, and volcanic plugs. Seen here is an outcrop at a hill called Big Butte, the namesake of the town itself. The hill is composed of Tertiary-aged porphyritic rhyolite that dates to 52 to 59 million years. Locality: outcrop along dirt road on Big Butte, hill on the western side of the town of Butte, Silver Bow County, western Montana, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/51057995317/ |
| 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@N05/51057995317. It was reviewed on 27 March 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 06:10, 27 March 2021 | | 3,008 × 2,000 (5.14 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51057995317/ with UploadWizard |
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