Re os dating pyrite

15-Jan-2018 20:28

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.

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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.