File:Chromitic talcose serpentinite (Shetland Ophiolite Complex, ~425-500 Ma; Unst, Shetland Islands, North Sea) (14819238911).jpg

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Chromitic talcose serpentinite (6.4 cm across), originally a ~basal crustal dunite peridotite.

This is from an ophiolite complex (Shetland Ophiolite Complex; a.k.a. Unst Ophiolite Complex) exposed on the island of Unst in the northeastern Shetland Islands (in the North Sea, between Scotland & Norway). The rocks in the area represent ~basal crustal rocks metamorphosed during the Caledonian Orogeny (~425-500 million years ago). Published research indicates that the original rocks were from a late Neoproterozoic-Cambrian intracontinental, ocean-floored rift basin.

Locality: abandoned quarry on island of Unst, northeastern Shetland Islands, North Sea.

Ophiolites are fragments of oceanic lithosphere (basaltic crust + uppermost mantle) that have been metamorphosed and plastered onto the edges of continental lithospheric plates by obduction (the opposite of subduction).
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Source Chromitic talcose serpentinite (Shetland Ophiolite Complex, ~425-500 Ma; Unst, Shetland Islands, North Sea)
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@N05/14819238911 (archive). It was reviewed on 30 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

30 November 2019

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current17:07, 30 November 2019Thumbnail for version as of 17:07, 30 November 20191,293 × 960 (187 KB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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