| Citation: | Kyiazbek Asilbekov, Rustam Orozbaev, Etienne Skrzypek, Christoph Hauzenberger, Elena Ivleva, Daniela Gallhofer, Jian-Feng Gao, Nikolay Pak, Anatoliy Shevkunov, Anatoliy Bashkirov, Aizat Zhaanbaeva. Age and Petrogenesis of the newly Discovered Early Permian Granite in the Kumtor Gold Field, Kyrgyz Tien-Shan. Journal of Earth Science, 2025, 36(3): 1090-1108. doi: 10.1007/s12583-024-0085-1
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Permian intrusions are widespread in the Middle and Southern Tien-Shan, with fewer occurrences in the Northern Tien-Shan. Notably, many of these intrusions are spatially associated with a variety of ore deposits, indicating a significant link between magmatic activity and mineralization processes in these areas. We studied granite samples recently recovered from drilling in the Kumtor gold field to evaluate their potential relationships with gold mineralization. The major and trace element geochemistry, zircon U-Pb age and Hf isotope data for this so-called Kumtor granite are reported. The Kumtor granite is metaluminous to peraluminous and belongs to the high-K and calc-alkaline series with Ⅰ-type geochemical characteristics. The relatively high K2O and Na2O concentrations and low high field strength elements (HFSE) and heavy rare earth elements (HREE), the presence of biotite within these Ⅰ-type granites, together with their low zircon saturation temperatures (731–779 ℃), suggest that they were likely derived from a hydrous source formed by dehydration melting of mica-bearing, medium- to high-K metabasaltic rocks. The zircon U-Pb dating results indicate that the Kumtor granite intruded at 293 ± 1.7 Ma, which is consistent with the age range of other Middle Tien-Shan granitoids. The zircon Hf isotopic composition is
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