File:Chromitic metadunite (recrystallized) (Day Book Dunite; Green Mountain Mine, northern Yancey County, Blue Ridge, southern Appalachians, western North Carolina, USA) (14874019279).jpg

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Chromitic metadunite (recrystallized) (8.0 cm across) from the Day Book Dunite.

Locality: Green Mountain Mine, ~2 km southeast of the town of Day Book, northern Yancey County, Spruce Pine District, Blue Ridge, southern Appalachians, western North Carolina, USA (35° 58’ 02” North, 82° 17’ 01” West).

In orogenic belts, olivine-bearing rocks often have the olivine component altered and metamorphosed, usually into serpentine. The Day Book Dunite is an exception to this. It is located in the Blue Ridge Province of the southern Appalachian Mountains in North Carolina, USA.

Dunites are >90% olivine varieties of peridotites, which are ultramafic intrusive igneous rocks. The Day Book Dunite of western North Carolina appears to represent a metamorphosed sliver of mantle rocks, but it has not been serpentinized. In the rock shown here, the greenish material is forsterite olivine (magnesium-rich (Mg,Fe)2SiO4). The black material is chromite (iron chromium oxide - FeCr2O4). Minor chlorite and magnesite are also present.

This rock has been metamorphosed somewhat (and thus should really be called metadunite, not dunite). The chlorite is a metamorphic mineral, and the smaller olivine crystals in this material have been attributed to metamorphic recrystallization. Metamorphism of the Day Book Dunite took place during the Ordovician (?).
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Source Chromitic metadunite (recrystallized) (Day Book Dunite; Green Mountain Mine, northern Yancey County, Blue Ridge, southern Appalachians, western North Carolina, 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@N05/14874019279 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 December 2019

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current17:54, 7 December 2019Thumbnail for version as of 17:54, 7 December 20191,330 × 952 (1.09 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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