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New data reveal radioactivity and element composition in magmatic rocks, indicating formation conditions.
New data are given on radioactivity and contents of rock-forming, radioactive (U, Th, K), noble (Au and Ag), rare-earth and other impurity elements in rocks of the most important magmatic complexes in the Lena region, which are close to auriferous areas (Mama-Oron: high-alumina granites and micaceous pegmatites; Telmama: high-sodium granitoids; Konkudera-Mamakan: high-alkaline granitoids which are represented by syenites and, mainly, by subalkaline granites; Kadali-Butuin: lamprophyres of alkaline basaltoids; Aglan-Yan: dikes and small intrusives of acidic composition). Rocks of each complex have been characterized. These characteristics can be used to identify the rocks within the province, to elucidate formation conditions and interregional correlation of magmatic processes.
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V. A. Zlobin (1991) studied this question.
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