KULADINSKIY MASSIF OF GORNYY ALTAY: ABSOLUTE AGE AND PETRO-GEOCHEMISTRY
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Abstract
New data on geological building, ore mineralization, composition, petrology, age and geofinamic of dorming alkaline granitoids of Kuladinskiy massif lead in paper. Two phases of intrusion detached: 1- - aegirine-riebeckite granite-porphyres, and 2- riebeckite leucogranites. Absolute age of aegirine-riebeckite granite-porphyres basic phase intrusion (U-Pb method on zircon SHRIMP II) composed 341-348 mln yers, that it correspond Early Carboniferous. Some zircons show and more ancient age (even to 401 mln years), related with assimilation by melt of Devonian rocks, grasping in process turning of massif. Signs of high activity of fluor-complexes in magmatic fluids reveal causing of manifestation of tetradic effect fractionation REE M-type. Increasing of values TEF REE positivity correlated with rise acidic environment of mineral-forming and rock-forming. Ratio of isotopes strontium and neodium show on take part of upper-mantle of components in generation of melt and forming of rocks Kuladinskiy massif. Geodinamic setting of forming alkali rocks of massif determine as riftogenic. Manifestations and intensive anomaly of Zr, Nb, Ta, Hf, rare earth elements, has strategic meaning related in space and paragenetic with granitoids of massif that it suffered feldspathization. An extension ore of category P3 estimated for Shibelik ore district.
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