Ore genesis of the Sadaigoumen porphyry Mo deposit, North China Craton: Constraints from pyrite trace element and lead isotope analyses

• DOI: 10.1016/j.oregeorev.2022.104698
• Publication Date: 2022-01-10T11:09:39Z
• Authors: Peiwen Chen; Bing Liu; Zhen Long; Lingli Zhou; Yong Fu; Qingdong Zeng
• Keywords: Trace element; Molybdenite

The Triassic Sadaigoumen porphyry Mo deposit is located in the northern margin of North China Craton (NCC). To constrain formation this deposit, we analyzed in-situ major, trace, and Pb isotopic compositions pyrite, as well isotopes molybdenite whole rocks. can be divided into five stages. Stages 1 2 are characterized by massive development magnetite with minor pyrite. Stage 3 main mineralization stage, much chalcopyrite deposited sub-stage 3.1 veins, only developed 3.2. 4 quartz–pyrite veins. Only quartz no sulfides was during stage 5. During all stages, Mo, Cu, Bi were pyrite mechanical inclusions; however, Zn may exist isomorphic substitutions or nano scale inclusions. from stages has constant Co/Ni ratios, but ratios significantly more varied variation largely due to mixing meteoric water ore-forming system 3. While hematite absent 3.1, Ag content ratio rapidly increased. Geochemical signatures indicated a shift reduced environment, such an increase highly radioactive isotope composition high Cu Py3.2 Py4 that elements continued precipitate crystal lattice after precipitation molybdenite. closely related addition reducing fluid upper crust evolution fluid, which important reference significance for delicate process NCC.