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| Citation: | Yang Zongyong, Zhu Jingjing, Pan Lichuan, Huang Mingliang, Wang Dianzhong, 2025. Petrogenesis of Yarigong Granodiorite in Batang Area and Constraints on Porphyry Cu Fertility, Eastern Tibetan Plateau. Earth Science, 50(11): 4195-4207. doi: 10.3799/dqkx.2024.159
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The Paleo-Tethyan Ocean, represented by the Jinshajiang River suture in eastern Tibetan Plateau, was consumed and closed in the Early-Middle Triassic, but the specific process after the oceanic crust demise is still poorly constrained. The potential for porphyry copper mineralization of magma generated in post-subduction setting remains unclear. In present study, geochronological and geochemical analyses were carried out on the Yarigong pluton in Batang area. Magmas were intruded in Late Triassic as corroborated by zircon U-Pb mean age of about 227 Ma. Rocks from this intrusion were characterized by high SiO2 (65.5% to 67.6%) and Mg# (53 to 64), as well as high initial 87Sr/86Sr values (0.709 8 to 0.711 8) and low εNd(t) values (-7.4 to -8.0). Magma generation of the Yarigong pluton resulted from interaction between melts derived from continental crust and peridotite mantle, and partial melts of the continental crust was likely associated with the break-off of early subducted Paleo-Tethyan oceanic slab. Geochemical compositions of amphibole and zircon suggest high magma H2O contents (>5%), the oxygen fugacity of magma is lower than magma related to typical porphyry Cu deposits, and extremely low S in magma was indicated by consistent low SO3 in apatite. These conditions imply barren magma for porphyry Cu deposit formation.
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