Mineralogical aspects of the Kuroko deposits in Japan and their implications |
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| Authors: | Urabe T |
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| Institution: | (1) Tokyo, Japan |
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| Abstract: | The most remarkable difference in mineralogy of the Kuroko deposits in Japan is shown in their mineral assemblages of wall-rock alteration. They can be divided into three types, namely: (I)kaolinite-pyrophyllite-diaspore type, (II)sericite-chlorite type, and (III)sericite-chlorite-carbonate type. The assemblage of sulfide minerals characteristically differs in each type of the deposits. The distribution of the Kuroko deposits, classified according to the three types, shows regional zoning. At the waning stage of the deposition of black ore of type (II), related mineral assemblages of both types (I) and (III) are found locally. Slight increase in fugacities of oxygen and sulfur, and decrease in temperature took place during the formation of a deposit. Regional zoning of the assemblage of alteration minerals, therefore, corresponds to slight differences in the processes of ore formation during deposition. |
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