朝鮮の-主として小延坪島のヴアナジウム・チタン・鐵鑛床
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概要
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Fifty-two miles to the north-west of the port of Inchon lies the small island of So-nYonpyong-do. Evenly distributed on the summit of this islands hill is to be found an are deposit of the eutectic mixture of ilmenite and vanadium-bearing magnetite occurring in bedded form and as a product of magmatic differentiation in the spotted pyroxenite derived from gabbro. This are deposit has twenty meters in thickness and spreads over an area of twenty-six thousand square meters. The are reserve is estimated at 2, 300, 000 metric tons. The typical are runs 50% in iron, 20% in titanium dioxide and 0.24% in vanadium. This are deposit ranks highest as a titanium deposit in Korea. By either oil flotation or magnetic separation, the are could be separated into ilmenite containing 47% TiO<SUB>2</SUB> and vanadium-bearing magnetite containing 65% Fe. Great hopes are placed on the development of this are body, as Japan is poor in titanium resources.
- 社団法人 東京地学協会の論文