Compared with the porphyry Cu-epithermal Au mineralization system,detailed studies on the porphyry Mo-epithermal Pb-Zn-Ag-Au mineralization are rare due to limited exposures.The Shipingchuan polymetallic deposit,located in the South China Mo Province(SCMP)represents a typical example containing both porphyry Mo and epithermal Pb-Zn-Ag mineralization.The Mo mineralization mainly occurs as molybdenite-quartz veins in veinlets or as disseminated molybdenite within the potassic,silicic,and sericitic syenogranite.The Pb-Zn-Ag mineralization is characterized by veinlet-type sphalerite-galena-pyrite-quartz-calcite vein within the volcanic rocks accompanied with silicification and propylitization.Five molybdenite samples yield a Re-Os isochron age of 104.7±0.7 Ma that is consistent with the zircon age(107.5±2.1 Ma)of the ore-bearing syenogranite within errors.Together with previous reported Ar-Ar ages(106.6-121.8 Ma)of Pb-Zn-Ag related volcanic rocks,the Mo and Pb-Zn-Ag mineralization belong to a magmatic-hydrothermal event in the Early Cretaceous.Meanwhile,the total Re contents of molybednite range from 1.28 to 45.55 ppm,indicating the ore-forming materials were from a mixture between the mantle and crustal material.Moreover,previous sulfur iso-topic values(3.7-4.3‰)of the pyrites from the porphyry Mo mineralization were consistent with the reported range of 4.0-6.1‰ of the sphalerites from the Pb-Zn-Ag mineralization,implying that the sulfur of two-types of mineralization was derived from magma.The above-mentioned spatial,temporal,and isotopic lines of evidence suggest that the Mo and Pb-Zn-Ag mineralization of the Shipingchuan deposit was formed from the same metallogenic system.In consideration of regional tectonic evolution history,we propose that the porphyry Mo-epithermal Pb-Zn-Ag mineralization formed in an extensional tectonic setting caused by the continued rollback and the eventual slab break-off of the subducting Paleo-Pacific plate.

Yongbin Wang;Peiling Feng;Lingli Zhou;Qingdong Zeng

Yunnan Key Laboratory of Earth System Science,Yunnan University,650500 Kunming,China;Key Laboratory of critical minerals metallogeny in universities of Yunnan province,Yunnan University,650500 Kunming,China;iCRAG and School of Earth Sciences,University College Dublin,BelfieldDublin 4,Ireland;Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,100029 Beijing,China;Innovation Academy for Earth Science,Chinese Academy of Sciences,100029 Beijing,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,100049 Beijing,China

地球化学学报（英文版）

[1]Yongbin Wang;Peiling Feng;Lingli Zhou;Qingdong Zeng-.Genetic links of porphyry Mo-epithermal Pb-Zn-Ag mineralization system:a case study of the Shipingchuan polymetallic deposit,South China)[J].地球化学学报（英文版）,2022(02):307-323

Shipingchuan,SCMP,veinlets,silicic,sericitic,veinlet,propylitization,molybednite,sphalerites

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