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File:Hydrothermal vein in Butte Quartz Monzonite (Woodville Canyon, northeast of Butte, Montana, USA) 4.jpg

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English: Hydrothermal vein in quartz monzonite in the Cretaceous of Montana, USA.

This outcrop is 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 rusty color of this vein is from iron oxide, produced by oxidative weathering of pyrite (mostly likely).

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
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Source https://www.flickr.com/photos/47445767@N05/50977769228/
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@N05/50977769228. It was reviewed on 26 February 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

26 February 2021

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current22:41, 26 February 2021Thumbnail for version as of 22:41, 26 February 20211,998 × 2,057 (4.43 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50977769228/ with UploadWizard

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