最近開発された黒鉱鉱床の鉱石とエレクトラム : 深沢鉱床

概要

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It has been noted that the Fukazawa ore deposits were found in the central area of the Hokuroku basin, while the other stratabound type Kuroko deposits are restricted to the marginal area of this basin.　　　So the mineralogical problems on the ores from the ore deposits, as well as those of other geological aspect, have been given much attention.　　　Recent studies on　the ores of the Kuroko deposits revealed that electrum is one of the most abundant and fairly ubiquitous minerals among minor constituent minerals.　　　This fact suggests that the detailed studies on the features and the modes of occurrence of electrum will he of great use in elucidating the genetic differences in each Kuroko deposit.　　　From this point of view, in addition to general descriptions on the ores, the present work chiefly dealt with modes of occurrence, associations, grain sizes, reflectivity values and chemical compositions of the electrum from the Fukazawa ore deposits. From the results obtained some genetic problems are mainly discussed here in comparison with those of other Kuroko deposits.