Bi Xianwu

The genesis of Lincang germanium deposit — A preliminary investigation

The mechanism of formation of the Lincang germanium deposit is discussed in the light of the spatial distribution of Ge-rich coal and siliceous rocks, the sulfur isotopic composition of pyrite in the Ge-rich coal, the variation of Ge abundance in the coal seams and the geochemical characteristics of the siliceous rocks. The results show that the siliceous rocks intercalated with the coal seams were deposited from a hydrothermal medium through which germanium was enriched in the coal beds. The primary source of germanium is thought to be the Ge-rich granite in the basement of the sedimentary basin.The mechanism of formation of the Lincang germanium deposit is discussed in the light of the spatial distribution of Ge-rich coal and siliceous rocks, the sulfur isotopic composition of pyrite in the Ge-rich coal, the variation of Ge abundance in the coal seams and the geochemical characteristics of the siliceous rocks. The results show that the siliceous rocks intercalated with the coal seams were deposited from a hydrothermal medium through which germanium was enriched in the coal beds. The primary source of germanium is thought to be the Ge-rich granite in the basement of the sedimentary basin.

REE geochemistry of primitive ore fluids in Ailaoshan gold belt, Southwest China

The REE patterns of primitive ore solutions in the Ailaoshan gold belt are characterized by significant enrichment of LREE, a weak negative anomaly of Eu and a rather strong negative anomaly of Ce. In conjunction with the tension crust in the region, the ore solutions are thought to be originated from a CQ2-rich fluid as a result of mantle degassing.