Geochronology and Petrogenesis of the Gol Mod Massif: Implications for the Geodynamic Evolution of the Orkhon-Selenge Belt, Northwestern Mongolia

The Orkhon-Selenge Belt is a Late Permian to Early Triassic volcanic plutonic belt located in northern Mongolia and part of the Central Asian Orogenic Belt. Selenge Complex, which Belt, key area for studying tectonic magmatic evolution This study aims contribute understanding geodynamic by investigating petrology, geochemistry geochronology rocks region. Our results indicate that intrusive were characterized as high-K, Calc-alkaline series metaluminous weakly peraluminous I-type granite affinities their geochemical characteristics are indicating arc-like signatures with depleted elements such Nb, Ta, Ti Y enriched Rb, Cs, Th, K light rare earth elements. Using zircon U-Pb dating, we determined an age 257.3±0.73 Ma alkali granite, suggesting south-western formed during time. pluton, closely related Erdenet-Ovoo porphyry type mineralization, composite intrusion. However, grains display low oxygen fugacity conditions, likely effect weak mineralization magma ascent tectonothermal event south-west this will provide insights into formation north-western segment Mongol-Okhotsk have implications our history