The investigation of Gumusdamla (Aydintepe-Bayburt) skarn mineralization as geological, mineralogical and genesis

The study area is located in the vicinity of Gümüşdamla Village of Aydıntepe District in the north of Bayburt province. In this study, 1/25000 scale geological map of the region and 1/2000 scale detailed mining geology map of mineralization area was made. The sedimentary units of Kabaköy Formation and rocks belonging to Kaçkar Granitoid outcrops in the study area. Detailed investigation of the mineralized area and its immediate surroundings are in the contact of Eocene aged Kaçkar Granitoid with Kabaköy Formation. In order to determine the paragenesis of mineralization in the study area, polished sections were prepared from the systematically collected samples and these are examined under ore microscope. The paragenesis of the mineralization is composed of intensively magnetite and hematite and to a lesser amount pyrite and chalcopyrite are also found. As a result of field observations, hematitization, limonitization, epidotization and argilitization were determined as the alteration types. The observed volcanic rocks are andesite, andesite / basalt and trachyandesite, according to chemical naming diagram of volcanic rocks of Nb/Y versus Zr/TiO2*0.0001. The negative Nb, Ta, Ti and Zr anomalies detected in the REE diagrams indicate that the volcanics in the studied areas carry features of subduction related continental arc magmas, and according to the tectonic discrimination graphs, they are the calc-alkaline basalt in characters. When the results were transferred to the granitic rocks classification diagram, it was determined that the samples are monzogranite and granite in composition with subalkalenic, high-potassium calc-alkaline-containing metaluminous and peraluminous character and they found to be I type of volcanic arc granite. The enrichment in elements such as Th, K, Rb expresses the crustal effect , and the negative anomaly in Nb and Ti indicates relation of subduction in the development of the main magma of the granitic rocks. According to the results of mineral chemical analysis, it was determined that pyroxene is diopside, plagioclase is andezine and anorthite, garnet is grossular and andradite in composition. Considering the mineral chemical values of pyroxene and garnets, it is concluded that skarn mineralization found in the study area is Fe-Skarn type.