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By Rex A.Crouch

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It certainly shows how the fracturing of the granite controlled the distribution of the hydrothermal activity. The source of the uranium may be derived from highly differentiated alkaline complexes. Two of these are rich in Th and U (the Ilimaussaq intrusion and the Mbtzfeidt Centre), a part of the U may come from this source, as may Th in the albitized veins. Uranium, however, has been found in a soluble form in the Ketilidian basement rocks. Two localities with uraninite have been found in the north of the Granite Zone in pre-granite supracrustal units (Fig.

Selected uranium mineraliza- tions in the Arjeplog-Arvidsjaur-Sorsele area, Geol. For. Stockh. Förh. 102 (1980) 288-290. , Uranium exploration in the N. Västerbotton province, northern Sweden, Uranium exploration case histories (IAEA-AG-250/2), Vienna (1980) 333-352. , Granite types in Sweden, Geol. For- Stockh. Forh. 102 (1980) 167-176. , The geological context of molybdenum occurren- ces in the southern Norrbotton region, northern Sweden, Geol. Rdsch. 71 (1982) 213-229. , Geological setting and geochemistry of uranium-rich granites in the Proterozoic of Sweden, Mineralog.

Förh. 102 (1980) 288-290. , Uranium exploration in the N. Västerbotton province, northern Sweden, Uranium exploration case histories (IAEA-AG-250/2), Vienna (1980) 333-352. , Granite types in Sweden, Geol. For- Stockh. Forh. 102 (1980) 167-176. , The geological context of molybdenum occurren- ces in the southern Norrbotton region, northern Sweden, Geol. Rdsch. 71 (1982) 213-229. , Geological setting and geochemistry of uranium-rich granites in the Proterozoic of Sweden, Mineralog. Mag. 46 (1982) 235-247.

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