STRUCTURAL CONTROLS ON VOLCANIC-HOSTED CU-MINERALIZATION: A CASE STUDY FROM YERGEN AND DEDENINYURDU, ÇORUM, TURKEY

The study area is located 4 km north on Gökçedoğan Village (Kargı-Çorum) at N Turkey. It comprises Bekirli Formation, Saraycık Formation, Beşpınar Formation, and Ilgaz Formation. Bekirli Formation consists of Paleozoic sericite schist, mica-amphibole schist, basic magmatic and volcanoclastic rocks. Saraycık formation composed of Upper Cretaceous Kargı Ophiolites, Upper Cretaceous pelagic limestone, siltstone, chert and spilitic volcanic rocks. While, Beşpınar formation contains Upper Cretaceous-Lower Eocene gravel, sandstone, limestone and marl units. Upper Pliocene gravel, sandstone and siltstone units are composition of Ilgaz Formation.

Yergen and Dedeninyurdu Cu mineralization hosted in spilitic basaltic rocks of Saraycık Formation related to silisification and carbonatization alteration zones. The mineralization zone directed N75-80^oE with 20 m long and 5 m thickness and 100 m long and 8 m thickness in Yergen and Dedeninyurdu area, respectively. The ore mineralogy includes chalcopyrite and pyrite with malachite, azurite, goethite, and limonite as a result of oxidation.

Two different type of deformation phases were observed in the mineralized area. The first one, NW-SE compression phase, comprises N70-80^o E trend fold axis. On the other hand, the second deformation phase, developed as a result of NW-SE stress, comprises N75-80^o E normal faults. Cu mineralization was related to and compatible with second deformation phase that cut the folds of the first deformation phase affected on the mineralized area. It shows that the mineralization occurred as hydrothermal vein type at last deformation phase.

Supported by TUBITAK project no: 113Y536