華南のインジウム資源の地質的背景, 特に大廠鉱床の成因について
2008 年 58 巻 2 号 p. 139-150
詳細
2008 年 58 巻 2 号 p. 139-150
In-bearing tin-polymetallic deposits of Dachang, Dulong, Kejiu and Chahe mines are reviewed. In the Dachang mine, In-contents are highest (average 310ppm) in the No. 100 orebody, which contains 2, 000tons In, but varies from 50 to 480ppm in the Changpo-Dongkeng orebodies, which contain more than 4, 000tons In. Primary concentration of S, In, Zn and Cu in the host impure limestones and black shales of Devonian age is considered remobilized together with Sn and W liberated from granitic magma during the Yanshanian stage. Therefore, genetic background of the Dachang deposits is quite different from that of the Japanese Island, which is subvolcanic vein type hosted mostly in volcanic rocks.
