Re os dating pyrite
Combined with other geological evidences, it is concluded that the two ages could not represent the epoch of the main mineralization which are assessed at 37-28 Ma based on other geological constraints.
However, 114 Ma is likely related to a mineralization event during diagenesis, while 65 Ma might indicate the beginning of hydrothermal mineralization of Jinding Zn-Pb deposit.
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The data suggest that at least one important ore-forming event was occurred during Indosinian epoch, and the ore-forming materials probably derived from mixed sources of crustal and mantle, while the later dominated.
The Ailaoshan composite orogen experienced complicated evolutional processes, including formation of Precambrian-Early Paleozoic basement, subduction and orogenesis of Late Paleozoic era, collisional orogenesis of Late Hercynian-Indosinain epoch, and extensional or striking orogenesis of Yanshainan-Cenozoic epoch.
Consequently, genetic models for ore formation are poorly constrained and remain controversial.
Here we use Re-Os geochronology to show that ore-stage pyrite from the Lisheen deposit formed at 346.6 ± 3.0 Ma, shortly after host rock deposition.
The ages of molybdenite and pyrite are consistent within the analytical errors.
The Baishan Mo–Re deposit is located in the eastern section of the eastern Tianshan orogenic belt, NW China.