Pustaka Ilmiah Universitas Padjadjaran

Abstrak

Sulfosalt Minerals from the Hydrothermal System of Southwestern Hokkaido, Japan: Its Genetic Significance

Epithermal gold-silver deposits from southwestern Hokkaido share a number of similarities being not only defined as one geologic unit but also as one metallogenic province (Bamba, 1977). One of its similarities is the high content of sulfosalts minerals from the deposits in the area. Sulfosalts are a subgroup of sulfides that contain a diverse and complex group of minerals and synthetic compound with complex composition and structures. According to Makovicky (1989), sulfosalts are defined as complex sulfides (rarely also selenides and tellurides) having the general formula AmBnXp, where A is a metal, commonly Cu, Pb, Ag and rarely Zn, Hg, Ti, Fe and Mn, and B is a typically a Group 15 semi-metal,As3+, Sb3+, Bi3+ but rarely also Te4+, while X are anions usually S2- but may also be partially substituted by Se2- and Te2-. The content of silver, copper and lead in sulfosalts minerals are of interest because of the large number of minerals reported in the group.