Pyroxmangite-, magnetite-, and pyrrhotite-bearing ores of the Oe manganese ore deposits in Hokkaido, Japan.

概要

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The Oe mine mostly produces manganese ore, and small amounts of copper, lead, zinc and iron sulphides. The Senzai vein of the mine is one of the representative ore deposits of the manganese carbonate ore. The country rocks consist of the Miocene quartz-diorite, green tuff and basalt. Manganese silicate minerals, which are mixtures of pyroxmangite and rhodonite, are locally found in the rhodochrosite-quartz ores. Some sulphides-quartz ores contain magnetite and hematite microcrystals. The magnetite is pseudomorph after hematite. The pyrrhotite is rarely found in pyrite and marcasite bands crustifying or cutting the banded rhodochrosite ores. It belongs to monoclinic system and Weiss type, and its chemical formula is estimated to be FeS1.14. These minerals may be crystallized in the intermediate stage of the mineralization at which the ore shoots were formed. It is considered that the occurrences and properties of the pyroxmangite-, magnetite-, and pyrrhotite-bearing ores did not show the existence of the xenothermal condition during the mineralization forming the Senzai vein.
資源地質学会の論文