<報文>北海道長法鉱山産マンガン鉱石について

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  • ホッカイドウチョウホウ コウザンサン マンガン コウセキ ニ ツイテ
  • <Original Papers>Manganese Ores from the Choho Mine, Hokkaido

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Choho Mine located in Otobe Village, Hokkaido, is one of the bedding manganese deposits in Tertiary sedimentary rocks. The manganese ores consist of manganite and rhodochrosite, and they always occur with banded and colloform structure. Manganite and rhodochrosite have been identified by microscopic examination, X-ray powder method and differential thermal analysis. The differential thermal analysis curve of the mixture of manganite and rhodochrosite shows that the endothermic peak of 570℃ as well as the characteristic peak of each mineral appeared. The product obtained after heating at each reaction temperature was examined by X-ray powder method. From these results, it is inferred that the 570℃ peak due to pyrolusite was formed by the decomposition of rhodochrosite by the action of vapour from decomposed manganite on heating. The author considers that the manganese ores, consisting of manganite and rhodochrosite, from this deposit were formed by the alternating deposition from the manganese bearing carbonate solution under the successive changes of pH.

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