Akademik Veri Yönetim Sistemi
74th Geological Congress of Turkey, Ankara, Türkiye, Ankara, Türkiye, 11 Nisan 2022, cilt.1, sa.1, ss.1
Horozköy granitoid and related felsic sub–volcanics located in the Inner Tauride Belt are key igneous rocks for better understanding and investigating the collision and closure orogenic of Inner Tauride suture of Neo–Tethys. This paper reports a new set of geochemistry, geochronology and isotope (Pb–S) geochemistry data for the felsic dikes (granite porphyry, granodiorite porphyry and quartz porphyry) and galena mineralization of Horozköy granitoid. These intrusive felsic rocks yield a zircon U–Pb age of 54.74±0.37 Ma, which crystallized in the early Eocene (Ypresian). The host rocks were examined under two groups as follows: dike–type igneous rocks and metamorphic rocks, usually marble in character, cut by these acidic rocks. Rare earth elements (REE) and tectonomagmatic discrimination diagrams of felsic intrusive rocks collected from the surface and drillings indicate that these felsic sub–volcanic samples are formed in the volcanic arc (active continental margin) tectonic environment. The ore formations are severely controlled by pluton, dikes, structure and stratum which are lens, layered and dike–type within the fracture or contact zone of Horozköy granitoid and surrounding rocks. The primary mineralization in the study area consists of sulphide minerals consisting of pyrite, chalcopyrite, sphalerite, especially galena and neodiganite. Secondary mineralization consists of oxidized and carbonated minerals such as anglesite, cerussite, hydrozincite, and limonite together with smithsonite and furthermore Au minerals are located in limonites. This mineralization is accompanied by calcite and quartz. The mineralization is located in the karstic cavities developed due to tectonics and the forties on their edges. Sulphur and Lead isotope analyses were performed on the galena mineral in order to determine the origin of the sulphur forming the ore minerals. According to the results of the analysis, δ34S values in galena samples vary between 4.7 and 7.00. The values of 206Pb/204Pb (the ratio of 206Pb from 238U to 204Pb) vary in a quite narrow range (18.998–18,563). It is thought that the mineralization in the Bolkardağ region is primarily of hydrothermal origin and the hydrothermal fluids forming the mineralization originate from the Horoz granite-granodiorite and they take their current position due to the oxidation and sulfurization of sulphide mineralization.