Geological And Geochemical Characteristics Of Granites And Predication In The Wushan District, Wuping, Fujian

Wushan County of Fujian Provience is located in the southern of Wuyi Mountain,belongs to the middle-eastern of Nanling metallogenic belt.The regional structure is belongs to eastern of Nanling Latitudinal belt and southern of Wu yi Mounain NE-NNE tectonic belt.Combined with actual production,through studying regional metallogenic geological setting,geology and geochemical date of regional,and focusing on the geochemical characteristics of granites,we point out the mineralization potential of the region and predicte mineralization target.Strata exposed in the area are mainly banding potash-granulitite and granulitite of Louziba Formation,Sinian Period.The fold structure is not developed,and there are four faults extending NW-NNW. With frequent magmatic activities, large volumes of granitic rocks are distributed in this area, composed of Caledomian gneissic biotite granites,Variscan moyite, Indosinian gneissic biotite granites and Yanshannian biotite granites.Geochemical data show characteristics with rich aluminum,rich potassium, K2O> Na2O,and poor calcium contents.The rockbody has a high differentiation index value and low consolidation index value,with a high degree of crystallinity evolution. The chemical composition is considerable with S-type granites rised by Chappell and White,with source material may be melting on the crust formed in the late orogeny, caused by metasomatism.The tatol REE content of granites body are 245.72×10-6 and 259.48×10-6, rich in LREE,8Eu value of 0.38 and 0.40, with an obviouse negative Eu anomalies, and transformation of continental crust-type granites.There is a right-dipping V-type standard REE distribution paterns,showing the S-type granite characteristics. Trace elements are enriched in R,W,Zn,Pb,Cu, and poor in Ba,Sr,showing that the rockbody have a high degree of crystallinity evolution and maybe supply metal element for the mineralization.Above characteristics indicate that the granites can become mother rocks of mineralization,show the great potential mineralization in this area.Based on the rock geochemical measuring,Au,Ag,W,Pb etc.metal anomaly county were identified,indicating there are more potential mineralization in this area. The statistics law shows that there are maybe multiple episodes of mineralization in this area.