Zircon U–Pb Age and Geochemistry of Ore-Hosting Rocks from the Liuhe Orefield of the Jiapigou Gold Ore Belt, NE China: Magmatism and Tectonic Implications

Liuhe gold orefield is being newly explored in the southeast part of Jiapigou ore belt, and occurs Neoarchean basement composed trondhjemite–tonalite–granodiorite (TTG). Zircon U–Pb data suggest that ore-hosting magma emplacement mainly took place two epochs: late to early Paleoproterozoic (ca. 2500 Ma) Jurassic Mesozoic era 170 Ma). The TTG rocks show higher A12O3 (12.58 15.71%) Na2O/K2O ratios (1.16 2.9), lower MgO (0.93 2.73%) Mg# values, with positive Eu anomaly low Y Yb content, high Sr/Y (22.3–79.6), plot adakite field Sr/Y-Y discriminant diagram belongs modern island-arc rocks. Samples this study are plotted pre-plate collision area R1-R2 discrimination diagram, fall into VAG + Syn-COLG Rb-Y Nb Nb-Y respectively, indicating magmatism related plate subduction. ore-bearing TTGs deposits were derived from partial melting mafic crustal caused by underplating basaltic on or active continental margin before collision. Dajiagou deposit occurred setting associated westward subduction paleo-Pacific beneath Eurasian Plate during period.