Chromitic serpentinite (Kraubath Complex; Sommergraben, Murz River Valley area, Styria Province, Austria)

            Chromitic serpentinite from an ophiolite in Austria. (7.9 cm across)

Greenish = serpentine (Mg3Si2O5(OH)4) - magnesium hydroxy-silicate) (originally olivine)
Black = chromite (FeCr2O4 - iron chromium oxide).

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).

This serpentinite sample is from the Kraubath Complex (a.k.a. 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.

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

Some rights reserved

Taken on: August 3, 2014

Tags:

ophiolite

serpentinite

chromite

Kraubath

Complex

Speik

Austria

Alps « less

Sets appears in: • Austria Rocks • Serpentinite more » • Ophiolite Rocks « less

Groups appears in: • Earth Science Teaching Resource

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