硫化鉱物の微量成分について
とくに東北日本内帯鉱床区の鉱床について
1962 年 78 巻 884 号 p. 81-91
詳細
1962 年 78 巻 884 号 p. 81-91
Quantitative spectrochemical analyses have been carried out in this study on common ore minerals such as sphalerite, chalcopyrite, pyrite, and galena collected from many mines in the Inner Northeast Japan. They were separated purified to study geochemical behaviors of minor elements in these minerals and their relation with ore deposits.
Many arguments have been raised as to what extent the contents of minor elements in these sulfide minerals from ore deposits were controlled by the conditions of formation of deposits.
366 sphalerites, 579 chalcopyrites, 432 pyrites and 146 galenas were analysed.The result was examined statistically to show the characteristics of minor elements distributing in sulfide minerals.
The distribution of minor elements in sulfide minerals in the ore deposits in the province is statistically characterized by extremely low contents of Ni, Co, high content of Bi, and show different distributions according to either massive (Kuroko and Kuroko type stockwork deposit) or vein type deposits.
Generally speaking, in xenothermal veins such as Ashio and pizumi mines, Bi, In, Sn and Co show high contents, in epithermal veins the contents of these elements decrease, and in massive. deposits they show extremely low contents. As, Sb, Ge, Ga, TI, Ag and Mo which are rarely detected in vein deposits are, however, concentrated in massive deposits, especially in Kuroko deposits. This fact is considered to suggest a peculiarity of the forming condition of the Kuroko deposits. The origin of minor elements in massive deposits (Kuroko), is discussed.
These conclusions clearly show that the distribution of minor elements in sulfide minerals has a close connection with the condition of ore formation.
