黒鉱および黒鉱鉱物の微量成分
1966 年 82 巻 944 号 p. 1065-1071
詳細
1966 年 82 巻 944 号 p. 1065-1071
In the Green Tuff region, detailed comparison of published and new analyses leads to the following conclusions about the distribution of minor elements in ore minerals, especially sulfide minerals:
(1) In xenothermal type deposits such as the Ashio mine, Bi, In, Sn and Co show high contents, and in epithermal vein deposits the contents of these elements decrease, while in Kuroko type deposits they show extremely low Contents.
(2) In Kuroko type deposits, As, Sb, Ge, Ga, Hg, TI, Ag, and Mo, which are rarely detected in vein deposits, show high concentration. Besides, enrichment of W, U, and V is in the oxide bed of Kuroko type deposits.
(3) These elements are closely similar to the elements which form volatile compounds of volcanic emanations at low temperature.
(4) If the distribution of minor elements in ore minerals has close connection with the conditions of ore formation, it is considered that enrichment of these elements in Kuroko type deposits deals with volatiles in volcanic emanation.
During the recent years many are becoming to believe that the Kuroko type deposit is of a submarine exhalative sedimentary origin by detailed field observations in the Kuroko area.Conclusions about the distribution of minor elements in ore minerals in the Kuroko type deposits support the exhalative sedimentary origin.
