1. U-Pb and Re-Os Geochronology of the Tongcun Molybdenum Deposit and Zhilingtou Gold-Silver Deposit in Zhejiang Province, Southeast China, and Its Geological Implications.
- Author
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Zeng, Qingdong, Wang, Yongbin, Zhang, Song, Liu, Jianming, Qin, Kezhang, Yang, Jinhui, Sun, Weidong, and Qu, Wenjun
- Subjects
ORE deposits ,URANIUM-lead dating ,RHENIUM ,OSMIUM ,GEOLOGICAL time scales ,MESOZOIC Era - Abstract
Mesozoic ore deposits in Zhejiang Province, Southeast China, are divided into the northwestern and southeastern Zhejiang metallogenic belts along the Jiangshan- Shaoxing Fault. 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 Mesozoic volcanic-intrusive complexes. Zircon U-Pb dating of the ore-related intrusive rocks and molybdenite Re-Os dating from two typical deposits ( Tongcun Mo deposit and Zhilingtou Au-Ag deposit) in the two metallogenic belts show the early and late Yanshanian ages for mineralization. SIMS U-Pb data of zircons from the Tongcun Mo deposit and Zhilingtou Au-Ag deposit indicate that the host granitoids crystallized at 169.7 ± 9.7 Ma (2σ) and 113.6 ± 1 Ma (2σ), respectively. Re-Os analysis of six molybdenite samples from the Tongcun Mo deposit yields an isochron age of 163.9 ± 1.9 Ma (2σ). Re-Os analyses of five molybdenite samples from the porphyry Mo orebodies of the Zhilingtou Au-Ag deposit yield an isochron age of 110.1 ± 1.8 Ma (2σ). Our results suggest that the metal mineralization in the Zhejiang Province, southeast China formed during at least two stages, i.e., Middle Jurassic and Early Cretaceous, coeval with the granitic magmatism. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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