The Weideshan Batholith and Felsic Dykes in the Eastern Jiaodong Peninsula: Is There Any Possible Relation to Gold Mineralization?

The genetic link between Weideshan-type rocks and gold mineralization in the Jiaodong Peninsula remains unclear. In this study, we examined the geochemical characteristics, water content, and oxidation states of Weideshan-type rocks and associated felsic dykes to assess the potential of a Weideshan-type batholith in directly contributing the fluids responsible for extensive gold mineralization. The findings reveal that the emplacement timing of Weideshan-type magmatic rocks in the Jiaodong Peninsula is slightly different from the timing of gold mineralization. Additionally, high zircon Eu/Eu* values indicate a relatively high water content within the Weideshan batholith. However, due to limited data on crystallization pressures, it remains equivocal whether water was saturated during the emplacement of the Weideshan batholith. Even if fluid saturation did occur, the magmatic oxidation states of Weideshan-type rocks are notably high (>FMQ + 1.5), which is incompatible with the reduced mineral assemblages typical of Jiaodong gold deposits. Therefore, our study suggests that the genetic link between gold mineralization and Weideshan-period granitic magmatism may be weak. [ABSTRACT FROM AUTHOR]