File:Butte Quartz Monzonite (Late Cretaceous, 76 Ma; Woodville Canyon, northeast of Butte, Montana, USA) 12.jpg
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| Description |
English: Quartz monzonite in the Cretaceous of Montana, USA.
These rocks are in 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. In the Butte, Montana area, 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. The loose, coarse-grained material surrounding the outcrop is grus. Geologic unit: Butte Quartz Monzonite, Boulder Batholith, late Late Cretaceous, Campanian Stage, 76.3 Ma Locality: roadcut on the western side of Frontage Road in Woodville Canyon, just south of Elk Park Pass, northeast of the town of Butte, Silver Bow County, southwestern Montana, USA See info. at: en.wikipedia.org/wiki/Grus_(geology) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50987092457/ |
| 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@N05/50987092457. It was reviewed on 2 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 | 17:51, 2 March 2021 | | 3,006 × 1,879 (5.41 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50987092457/ with UploadWizard |
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