The origin of massive sulfide deposits within the Koçali complex (Adıyaman)

The Southeast Anatolian Orogenic Belt was developed as a result of geological processes related to the closure of the southern branch of the Neotethtan ocean during Late Cretaceous-Miocene time period between Taurid Platform to the north and Arabian Platform to the south. The Koçali Complex within this orogenic belt, The Cu-Fe-Zn sulphide mineralizations developed. This study aim to find out the origin of the massive sulphide deposits. In this context, the whole rock geochemistry, the mineral geochemistry, isotope geochemistry and fluid inclusion studies had been performed on the samples from these mineralizations.The mineralizations within the Koçali Complex are observed as massive, disseminated and stockwork pyrite-chalcopyrite mineralizations in the sheeted dike complex and pillow lavas belong to fragmented and tectonically sliced ophiolite block. The mineral paragenesis consist of pyrrhotite, bornite, idaite, digenite, specularite, chalcocite, covellite, fahlerz and sphalerite other than pyrite and chalcopyrite. The gang minerals are quartz and calcite. The orgin of the sulphur in the mineralizations has a magmatic affinity according to the ? 34S isotope analyses. The geochemical analyses show that the basaltic host rock is formed in a tectonic setting related to subduction and the mineralizations formed as a result of a hydrothermal phase identified as low-temperature hydrothermal activity. The field, petrographical and fluid inclusion evidences show that the Cu-Fe-Zn mineralizations within the Koçali Complex are related to Cyprus-type massive sulphide deposits.