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File:Greenstone (metagabbro) (metamorphism at ~2.7 Ga, Neoarchean; Rt. 169 roadcut south of Peyla, Minnesota, USA) 6 (23410765906).jpg

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Greenstone (metagabbro) in the Precambrian of Minnesota, USA. (geology hammer for scale)

Greenstone is a greenish-gray colored, low- to intermediate-grade metamorphic rock. It usually has a crystalline texture, but sometimes is weakly foliated. Greenstone forms by the metamorphism of mafic igneous rocks such as basalt and gabbro. The greenstones seen above were originally gabbros that were metamorphosed at about 2.7 billion years ago, during the Late Archean Algoman Orogeny. The near-vertical layering is metamorphic foliation, accentuated by whitish veins.

Locality: Peyla South Outcrop - roadcut on the western side of Rt. 169, just south of milepost 383 & just south of the Rt. 169-Tarkman Road intersection, ~2.7 miles south of the town of Peyla, north-central St. Louis County, northeastern Minnesota, USA (47° 44’ 58.14” North latitude, 92° 22’ 58.00” West longitude)
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Source Greenstone (metagabbro) (metamorphism at ~2.7 Ga, Neoarchean; Rt. 169 roadcut south of Peyla, Minnesota, USA) 6
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@N05/23410765906 (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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current05:52, 5 December 2019Thumbnail for version as of 05:52, 5 December 20193,000 × 4,000 (4.53 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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