File:Granite dike cutting xenolith (Giants Range Batholith, Neoarchean, 2.674-2.682 Ga; Confusion Hill roadcut, just north of Virginia, Minnesota, USA) (23053635374).jpg

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Granite dike cutting xenolith in the Precambrian of Minnesota, USA.

This is part of a famous outcrop in northeastern Minnesota - Confusion Hill. These are intrusive igneous rocks (principally light-colored tonalite & dark-colored diorite) of Late Archean age, part of the Giants Range Batholith.

The dark-colored mass seen above is a xenolith ("foreign-rock") that got incorporated into the magma before final solidification. The subvertically-oriented, dark pinkish-gray structure running through the xenolith is a granite dike.

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 Granite dike cutting xenolith (Giants Range Batholith, Neoarchean, 2.674-2.682 Ga; Confusion Hill roadcut, just north of Virginia, Minnesota, USA)
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@N05/23053635374 (archive). It was reviewed on 9 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

9 October 2019

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Date/TimeThumbnailDimensionsUserComment
current06:17, 9 October 2019Thumbnail for version as of 06:17, 9 October 20194,000 × 3,000 (4.44 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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