Geology, geochronology, and stable isotopes of the Triassic Tianjingshan orogenic gold deposit, China: Implications for ore genesis of the Qinzhou Bay & ndash;Hangzhou Bay metallogenic belt

摘要

The Qinzhou Bay?Hangzhou Bay metallogenic belt (QHMB), South China, contains numerous variable deposits, including Au, Cu, Pb, Zn, Ag, W, Sn, U-polymetallic ore deposits. The Tianjingshan gold deposit is located in the northern segment of the QHMB and is a typical large-scale lode gold deposit. Auriferous quartz veins occur along the contact zones between the Neoproterozoic greenschist-facies metamorphic rocks and gneissic granite and are structurally controlled by brittle faults. Mineralization-related hydrothermal alteration mainly includes silicification, pyritization, sericitization, and chloritization. Four stages of alteration and mineralization are recognized: quartz (I), quartz?pyrite (II), quartz?polymetallic sulfide (III), and quartz?carbonate?fluorite (IV) stages. Gold mineralization occurs mainly in stages II and III, as visible gold.