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The mechanism of formation of the Lincang germanium deposit is discussed in thelight of the spatial distribution of Ge-rich coal and siliceous rocks, the sulfur isotopic composi-tion of pyrite in the Ge-rich coal, the variation of Ge abundance in the coal seams and the geo-chemical characteristics of the siliceous rocks. The results show that the siliceous rocks interca-lated with the coal seams were deposited from a hydrothermal medium through which germani-um 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 composi tion of pyrite in the Ge-rich coal, the variation of Ge abundance in the coal seams and the geo-chemical characteristics of the siliceous rocks. The results show that the siliceous rocks interca-lated with the coal seams were deposited from a hydrothermal medium through which germani-um 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.