藏王鉱山の地質構造と富鉱体との関係について
1954 年 4 巻 13 号 p. 147-157
詳細
1954 年 4 巻 13 号 p. 147-157
The sulphur and iron-sulphide ore deposits of exhalative replacement type at the Zao mine, Yamagata Prefecture, occur in andesitic lava flows and pyroclastic rocks of the Zao volcano. The important structural components distinguished in this mining area are fractured zones striking nearly N 10°W, in which sulphur deposits, solfataras and hot springs are found. These fractured zones were the main channel ways for the mineralizing solutions and gases.
Localization of high-grade sulphur ore bodies appears to have been controlled by the intersection of fractures with favorable beds such as tuff and tuff-breccia beds.
