Petrology of ultramafic to mafic cumulate rocks from the Göksun (Kahramanmaras¸ ) ophiolite, southeast Turkey

Önal, Güzide | Bağcı, Utku

The Göksun (Kahramanmaras¸ ) ophiolite (GKO), cropping out in a tectonic window bounded by the Malatya metamorphic unit on both the north and south, is located in the EW-trending lower nappe zone of the southeast Anatolian orogenic belt (Turkey). It exhibits a complete oceanic lithospheric section and overlies the Middle Eocene Maden Group/Complex with a tectonic contact at its base. The ophiolitic rocks and the tectonically overlying Malatya metamorphic (continental) unit were intruded by I-type calc-alkaline Late Cretaceous granitoid (w81e84 Ma). The ultramafic to cumulates in the GKO are represented by wehrlite, plagioclase wehrlite, olivine gabbro and gabbro. The crystallization order for the cumulate rocks is as follows: olivine chromian spinel/clinopyroxene/plagioclase. The maj...