世界のウラン資源概觀
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概要
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Uranium and thorium are found in a variety of rocks and in widely different formations, but the important primary uranium deposits have been found along the belts of “Shield” composed of ancient pre-Cambrian crystalline rocks. Examples are Great Bear Lake veins and Beaverlodge deposits in Canada, Shinkolobwe veins in Belgian Congo and Rum Jungle deposits in Australia.<BR>The next important deposits exist in the areas called “Massif” of old crystalline rocks which are known in western Europe, such as French “Massif Central” including La Crouzille veins, Bohemian Massif including Joachimsthal veins and Portuguese-Spanish “Meseta” including Urgei-riça, vein deposits. Besides these the widespread areas of permeable sediments stand out as the most productive. Most excellent examples are horizontally stratified formations of Colorado Plateau in the United States.<BR>The most productive thorium deposits would include the peninsula of India, the hinterland behind the coastal areas of Brazil and the piedmont of the Carolinas in the United States.
- 社団法人 東京地学協会の論文