<scp><scp>U–Pb</scp></scp> and <scp><scp>Re–Os</scp></scp> Geochronology of the <scp>T</scp>ongcun Molybdenum Deposit and <scp>Z</scp>hilingtou Gold‐Silver Deposit in <scp>Z</scp>hejiang <scp>P</scp>rovince, Southeast <scp>C</scp>hina, and Its Geological Implications

Abstract

Abstract Mesozoic ore deposits in Z hejiang P rovince, S outheast C hina, are divided into the northwestern and southeastern Z hejiang metallogenic belts along the J iangshan– S haoxing F ault. The metal ore deposits found in these belts are epithermal Au–Ag deposits, hydrothermal‐vein Ag–Pb–Zn deposits, porphyry–skarn Mo ( Fe ) deposits, and vein‐type Mo deposits. There is a close spatial–temporal relationship between the Mesozoic ore deposits and M esozoic volcanic–intrusive complexes. Zircon U–Pb dating of the ore‐related intrusive rocks and molybdenite Re–Os dating from two typical deposits ( T ongcun Mo deposit and Z hilingtou Au–Ag deposit) in the two metallogenic belts show the early and late Y anshanian ages for mineralization. SIMS U–Pb data of zircons from the T ongcun Mo deposit and Z hilingtou Au–Ag deposit indicate that the host granitoids crystallized at 169.7 ± 9.7 M a (2σ) and 113.6 ± 1 M a (2σ), respectively. Re–Os analysis of six molybdenite samples from the T ongcun Mo deposit yields an isochron age of 163.9 ± 1.9 M a (2σ). Re–Os analyses of five molybdenite samples from the porphyry Mo orebodies of the Z hilingtou Au‐Ag deposit yield an isochron age of 110.1 ± 1.8 M a (2σ). Our results suggest that the metal mineralization in the Z hejiang P rovince, southeast C hina formed during at least two stages, i.e., M iddle J urassic and E arly C retaceous, coeval with the granitic magmatism.