GSA Annual Meeting in Seattle, Washington, USA - 2017

Paper No. 65-10
Presentation Time: 9:00 AM-5:30 PM


YALCIN, Cihan1, HANILCI, Nurullah1, KUMRAL, Mustafa2, TANC, Beril3 and KAYA, Mustafa2, (1)Geological Engineering Department, Istanbul University, Istanbul University /, Istanbul, 34320, Turkey, (2)Geological Engineering Department, Istanbul Technical University, Buyukdere St., Istanbul, 34469, Turkey, (3)Chemistry Department, Faculty of Arts and Sciences, İstanbul, 34469, Turkey,

Kargi (Corum) area is located in the eastern part of Pontide (N Turkey). The evolution of the Paleo-Tethys and Neo-Tethys Oceans outlined the tectonostratigraphy of this area as well as was responsible for its mineralization. Relatively autochthonous rocks that are considered to be basement rocks were overlain by allochthonous formations in the study area. The autochthonous sequence is represented by Bekirli metamorphic rocks while the allochthonous sequences are represented by Kargi ophiolitic melange. Mineralizations (e.g. Cu-Zn) are observed in both stratigraphic sequences (Bekirli metamorphics and Kargi ophiolites).

The Göçükdibi and Kömürlükdere Cu-Zn mineralization that was formed as the parallel to the schistosity planes in quartz-chlorite schist’s as well as disseminated in the wall rock in the autochthonous Bekirli metamorphic rocks. The ore paragenesis includes chalcopyrite, sphalerite, and pyrite with minor amounts of galena as primary sulphides, and azurite and malachite minerals that developed as secondary minerals into fractures and faults cut the Göçükdibi mineralization. The initial data stated that this mineralization that was compatible with the schistosity is considered to be syngenetic. Also, they stated the presence of the clastic facies. These data are similar to the volcanogenic massive sulfide (VMS) mineralization developed in clastics dominated geological environments.

The Cu±Zn mineralizations in allochthonous sequences are represented by Dedeninyurdu, Yergen, and Ahmetaganinyeri mineralizations. These mineralizations occurred in meta-alkaline rocks of Upper Cretaceous Kargi ophiolitic mélange as vein-type within NE-SW trending fracture lines. The vein-type mineralization includes pyrite, chalcopyrite, sphalerite, pyrrhotite, and goethite minerals in the paragenesis. Pyritization, silicification, sericitization and carbonatization alteration types developed around this vein-type Cu-Pb±Zn mineralization in the melange.

Supported by TUBITAK project no: 113Y536