File:Magnetite-garnet-quartz meta-iron formation (Archean; Quad Creek section - Beartooth Highway roadcut, Beartooth Mountains, Montana, USA) 1 (15196729426).jpg

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Magnetite-garnet-quartz meta-iron formation from the Precambrian of Montana, USA. (5.4 cm across at its widest)

This iron formation sample has been metamorphosed at least twice during the Archean. At about 3.2 Ga, the protolith iron formation lithology (depositional age ~3.3 Ga) was subjected to granulite facies metamorphism. At about 2.8 Ga, the rock was subjected to upper amphibolite facies metamorphism.

The rock is dominated by magnetite (a magnet will easily stick to it), but also has much quartz and garnet (= the reddish specks) (click on the photo to zoom in).

Locality: Quad Creek section (= locality of Mueller et al., 1987) - roadcut on southern side of Beartooth Highway (Rt. 212), immediately west of Quad Creek, between milepost 50 and milepost 51, southern side of Rock Creek Canyon, just north of the eroded edge of Beartooth Plateau, southwest of the town of Red Lodge, Beartooth Mountains, southern Montana, USA (45° 01' 41.27" North & 109° 24' 55.31" West)

Some info. from:

Mueller et al. (1987) - Geological Society of America Centennial Field Guide, Rocky Mountain Section, pp. 75-76.

Maier (2011) - Geology and Geochemistry of Haean Zircon-Bearing Supracrustals from Quad Creek, Eastern Beartooth Mountains, Montana, USA. M.S. Thesis. University of Colorado. 59 pp.
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Source Magnetite-garnet-quartz meta-iron formation (Archean; Quad Creek section - Beartooth Highway roadcut, Beartooth Mountains, Montana, USA) 1
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@N05/15196729426. 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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current05:44, 5 December 2019Thumbnail for version as of 05:44, 5 December 20193,020 × 1,992 (3.37 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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