Trace elements in deposits of jurassic paleovalleys of the Chulym-Yenisei depression - (Malinovskoe uranium deposit)

The REE composition of uraniferous alluvial deposits in the Malinovskaya pa leovalley of the Chulym-Yenisei depression is studied. The contents of elem ents are determined by the INAA and X-ray fluorescent methods and by emissi on and X-ray spectroscopies. The minerals are identified by X-ray, luminesc ent, and laser analyses. According to clarke of concentration, the elements follow the sequence: Se (3600), U (250), W (185), As (47), Mo (13), V (6.3), Hf (2.1), Ge (1.8), Y (1.3), Se 0.2), Zr 0.2), Sigma REE (0.9), and Th (0.4). Such elements as U, Mo, So, V, Hf, W, As, and Y are characterized by an extremely uneven distr ibution in the deposits (V > 70%). The ore-bearing zone shows three types o f elevated concentrations of elements: primary clastogene (W, Ge), primary sorption-biogenic (U, Se, Mo, V, As), and secondary redeposited infiltrogen ic (elements of the first two types plus Hf, Sc, and Sigma REE). The high c ontent of W is explained by its supply from primary deposits of the Altai-S ayan region, and the high content of Ge is due to the presence of fragments of Ge-bearing coals.