File:Epidotic granite dike (Giants Range Batholith, Neoarchean, 2.674-2.682 Ga; Confusion Hill roadcut, just north of Virginia, Minnesota, USA) 4 (23656663116).jpg

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Epidotic granite dike in the Precambrian of Minnesota, USA.

This is part of a famous outcrop in northeastern Minnesota - Confusion Hill. These are intrusive igneous rocks (principally dark-colored diorite at this spot) of Late Archean age, part of the Giants Range Batholith. The greenish and pinkish structure is an epidotic granite dike that has intruded through the host rock. The greenish mineral is epidote, a calcium hydroxy-aluminoferrosilicate, Ca2(Al,Fe)3(SiO4)3(OH). The pinkish mineral is potassium feldspar, a potassium aluminosilicate, KAlSi3O8.

Geologic unit & age: Giants Range Batholith, Neoarchean, 2.674 to 2.682 Ga

Locality: Confusion Hill outcrop - roadcut on the eastern side of northbound Rt. 169/Rt. 53, immediately north of roadside rest stop, northwestern side of Lookout Mountain, Laurentian Divide, just north of the town of Virginia, central St. Louis County, northeastern Minnesota, USA (47° 34' 40.71" North, 92° 32' 37.21" West)

Site-specific info. from:

Peterson et al. (2005) - Architecture of an Archean greenstone belt: stratigraphy, structure and mineralization. Minnesota Geological Survey Guidebook 21: 154-180.
Date
Source Epidotic granite dike (Giants Range Batholith, Neoarchean, 2.674-2.682 Ga; Confusion Hill roadcut, just north of Virginia, Minnesota, USA) 4
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@N05/23656663116 (archive). It was reviewed on 5 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

5 December 2019

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current05:54, 5 December 2019Thumbnail for version as of 05:54, 5 December 20194,000 × 3,000 (3.71 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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