Petrogenesis and Metallogenesis of Granitoids in the Yangla Cu-W Polymetallic Deposit, Southwest China: Evidence from Zircon Trace Elements and Hf Isotope

Magmatic zircon tends to present characteristic trends in trace element compositions response magma petrogenesis and metallogenesis, such that may provide a window into melt evolution not accessible by whole rock chemistry. The Yangla large Cu deposit is located the central part of Jinshajiang Suture Zone, southwest China, constrained between Faults. In this study, elements hafnium isotopic zircons from quartz diorite were studied. Previous published relevant data granitoid plutons (i.e., dioritic enclave, granodiorite, monzonite porphyry) also have been systematically cited discussed. result shows crystallization temperature two-stage Hf mode ages (tCDM; age source rocks for magmas) gradually increased while oxygen fugacity (fO2) εHf(t) values decreased, corresponding enclave (~232 Ma), through granodiorite (~208 Ma) porphyry (~202 (~195 Ma). It suggested four same three-component mixing upper crust + lower mantle magmas, crustal metasediments ratios early late stage. increasing inputs resulted higher melting temperatures initial magma. All melts experienced distinct fractional apatite, titanite, amphibole, later granite assimilation degrees than ones processes stages intrusive rocks. These granitoids are products large-scale acid magmatic emplacement activities Triassic-early Jurassic good metallogenic potential Cu-W polymetallic deposit.