Two intense tectonic-magmatic activities during the Yanshanian have been identified in the adjacent area of Zhejiang

Jiangxi

and Anhui provinces (the WZG region). Correspondingly

there are two entirely different kinds of granites. The early Yanshanian granites are composed of granodiorite

  and the rock is nearly neutral

enriched in Au

Ag

Cu

Mo

and Ni elements. The late Yanshanian granites are composed of granite porphyry

and the rock is acidic

depleted in these metallogenic elements. Therefore

the Cu

Au

Mo mineralization in the study region is related to these Yanshanian plutons. The oxygen fugacity (f

O2

) of the magma calculated by zircon Ce anomalies and Ti-in-zircon temperatures shows that the average magmatic f

O2

for the early Yanshanian granites in the study area is fayalite-magnetite-quartz (FMQ) +2.7

much higher than that of the late Yanshanian granites (FMQ -1.1). Thus

the high oxygen fugacity contributes to the formation of Cu

Au

and Mo deposits. With the popularity of the zircon analysis

it is much easier to obtain the content of rare earth elements in zircon. Using zircon trace element to calculate the oxygen fugacity tends to have a broad prospect.