File:Porphyritic rhyolite (Paleocene-Eocene, 52-59 Ma; Butte, Montana, USA) 3.jpg
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English: Porphyritic 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. Seen here is an outcrop of porphyritic rhyolite on Montana Tech's campus. This rock is part of the Lowland Volcanics in the Butte area - they are Paleocene to Eocene in age and date to 52-59 million years old. Rhyolite is a felsic, aphanitic, extrusive igneous rock - it is one of many types of lava. Locality: outcrop near the mineral museum on Montana Tech campus, western side of the town of Butte, southwestern Montana, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/51050936218/ |
| 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@N05/51050936218. 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 (4.43 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51050936218/ with UploadWizard |
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