File:Chromitic serpentinite Styria Province, Austria.jpg

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Chromitic serpentinite (7.9 cm across) from the Kraubath Complex (Speik Complex) in the Eastern Alps of Austria. The Kraubauth Complex is an ultramafic massif dominated by metamorphosed dunites & harzburgites. The original rock (protolith) was a Proterozoic-Early Paleozoic upper mantle dunite peridotite that has been multiply metamorphosed during the Devonian, Permian, and Mesozoic. Greenish = serpentine; black = chromite (FeCr2O4 - iron chromium oxide).

Locality: Sommergraben, Murz River Valley area, Muralpen, Eastern Alps, central Styria Province, Austria.

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).
Date
Source Chromitic serpentinite (Kraubath Complex; Sommergraben, Murz River Valley area, Styria Province, Austria)
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14822310115. It was reviewed on 23 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

23 August 2014

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