The ophiolite of the Koziakas range Western Thessaly (Greece)
Capedri, S.; Lekkas, E.; Papanikolaou, D.; Skarpelis, N; Venturelli, G.; Gallo, F.
Neues Jahrbuch für Mineralogie - Abhandlungen Band 152 Heft 1 (1985), p. 45 - 64
22 references
published: Jun 21, 1985
ArtNo. ESP154015201003, Price: 29.00 €
Abstract
First petrographic and chemical data are reported for the Koziakas ophiolite whose geological setting is unique in the Hellenides. It is Jurassic and consists mainly of ultramafites and pillow basalts, while gabbros and dykes are rare. The magmatic activity was contemporaneous with the deposition of radiolarites and red clays. The ultramafic rocks are spinel-harzburgites and plagioclase-harzburgites, with variable content of clinopyroxene. The basaltic rocks resemble oceanic products and have variable geochemical imprint (normal, transitional and enriched MORB), as suggested by Nb/Y and Nb/Zr ratios, and clinopyroxene composition. One dyke cutting the ultramafites has unusual features, i.e. very low Ti, P, Zr, Y, and high Cr, Ni and Mg contents. One gabbro dyke (plagioclase-olivine-clinopyroxene-spinel) is peculiar in having exceptionally low V and Sc contents.
Keywords
Ophiolite • ultramafite • pillow basalt • petrography • mineral composition • chemical composition • Thessaly (Koziakas) • Greece