Contribution of Triassic Tectonomagmatic Activity to the Mineralization of Liziyuan Orogenic Gold Deposits, West Qinling Orogenic Belt, China

The Western Qinling orogenic belt (WQOB) is one of the most important prospective gold districts in China, with widely distributed Indosinian intermediate–acidic intrusions. Liziyuan Au deposit a representative northern WQOB, hosting several sections spatially associated igneous rocks. hosted by meta-sedimentary volcanic rocks Cambrian–Ordovician Group and Tianzishan monzogranite. Two periods, including five stages mineralization, are recognized this area: an early metamorphic mineralization period (PI), quartz–pyrite (Stage I) banded quartz–polymetallic sulfide II) veins, later magmatic (PII) quartz–K-feldspar–pyrite–molybdenite veins III), sulfide–chlorite ± calcite veinlets stockwork IV), late calcite–quartz V). Geochronological studies indicate SHRIMP zircon U-Pb age 236.1 Ma for monzogranite, our published ages ore-bearing diorite porphyrite Suishizi section granite porphyry Jiancaowan being 213 212 Ma, respectively. Pyrites formed association PI PII have well-defined Rb–Sr 220 7.5, 205.8 8.7, 199 15 close temporospatial coupling between magmatism. δ18O δD values fluid inclusions Stage IV auriferous quartz range from −0.03‰ to +5.24‰ −93‰ −75‰, respectively, suggesting that mineralizing was likely origin. Three distinct ranges δ34S identified studied (i.e., 7.04‰–9.12‰, −4.95‰ −2.44‰, 0.10‰–3.08‰), indicating source containing multiple sulfur isotopes derived fluids. thus closely related Geochemical characteristics monzogranite adakitic thickened lower crust during Triassic orogenesis. post-collision extensional setting. Together previous geological geochemical data, results collisional–compressional metamorphism fluids evolution WQOB.