Le gisement de tungstène de Xihuashan (Sud-Jiangxi,Chine): Relations granites,altérations deutériques-hydrothermales,minéralisations

The Xihuashan tungsten deposit (South Jiangxi, China) is located on the border of a granitic stock composed of four intrusive units: γ _inf2a ^sup5 , γ _inf2b ^sup5 , γ _inf2c ^sup5 and γ _inf2e ^sup5 chronologically. The deposit is situated in γ _inf2a ^sup5 and γ _inf2b ^sup5 whose contact zone is marked by a stockscheider and by a sporadic fine-grained granite designated γ _inf2b′ ^sup5 . The feldspathic episyenitic veins or masses located mainly in γ _inf2b ^sup5 resulted from granite alteration. This alteration characterizes the fluid activity which followed previous mechanical action, remnant liquids draining under structural control. The quartz-bearing Xihuashan veins (Dayu mining district) are a typical wolframite-quartz vein deposit and have developed mainly in γ _inf2b ^sup5 . The density of the veins and the huge mineralizations in γ _inf2b ^sup5 can be explained by the carapace role played by γ _inf2a ^sup5 , γ _inf2b′ ^sup5 and the stockscheider. The deposit is formed by 615 economically valuable veins (medium grade: 1,08% in WO₃) characterized by four stages of mineralization; a reverse vertical zoning is generally observed. Thus, the Xihuashan tungsten deposit possesses a metallogenic value contributing to the comprehension of metallogenic and structural phenomena related to the evolution of granitic masses.