Akademik Veri Yönetim Sistemi
16th Biennial Meeting of the Society-for-Geology-Applied-to-Mineral-Deposits (SGA), ELECTR NETWORK, 28 - 31 Mart 2022, ss.400-403
Even though mechanisms of crustal growth and differentiation are well known, the spatial and temporal evolution of the composition of the continental crust remains poorly constrained, even more when considering the metal budget in mountain belts. In this study, we use the Eastern Pontides, NE Turkey, as a natural laboratory to decipher the role of successive tectono-magmatic events during the buildup of the continental crust fertility. This area is a Gondwana-derived terrane that accreted to the Eurasian margin. It underwent successive orogenic phases associated with the closure of the Paleo- and Neotethys oceans, and lastly the Alpine orogeny. It hosts abundant volcanogenic massive sulfide, porphyry and epithermal deposits, mostly formed in the latest stages of arc construction. These features relative to the buildup of metal fertility in this continental crust raise questions such as were the physico-chemical conditions during the early sterile history of the Eastern Pontides unfavorable to form ore deposits or were the metals progressively concentrated in the crust during successive orogenic events? We will use whole-rock geochemistry, U-Pb zircon dating, and Hf-O isotopic and trace element compositions of magmatic zircons to constrain the construction of the continental crust in the Eastern Pontides, and its metal fertility through time.