Results
- The basic regularities of Paleozoic magmatism evolution in the development of the Ural epioceanic orogen were found: the mantle magmatism (460-395 Ma) replacement by the mantle-crust one (365-310 Ma) and the crustal granite one (290-250 Ma). During the orogen development the respective changes took place in the magmatic series composition, their fluid regimen and the associated endogenous mineralization composition.
- From the western end of Eurasia to the Trans-Baikal and Mongolia, a correlation of the Late Paleozoic granitoid magmatism and its major age range was revealed: 320-300, 290 and 270-250 Ma. The coeval granitoids of different areas were shown to differ in certain parameters of the substance composition respective to the diversity of geodynamic settings and differences in the substrate composition.
- A complex of the Middle Devonian porphyry dikes of subalkaline composition, containing a unique set of phenocryst minerals, including garnet, magmatic epidote and apatite rich in sulfate sulfur and anhydrite inclusions was identified. The mineral formation was due to the melting of ancient crust substrate under the influence of aqueous fluid rich in sulfur.
- Extrusive and intrusive ankaramites were revealed as part of the Early Middle Devonian island-arc volcanic formations of the Middle and South Urals (see photo). It was concluded that ankaramite melts could also be ancestral for the platinum-bearing dunite-clinopyroxenite-gabbro complexes of the Ural-Alaskan type.
Схема тектоно-магматического районирования Среднего и Южного Урала (Ферштатер, 1992, сизменениями). I - II островодужно-континентальные мегаблоки: северо-западный (I) с ордовикско-силурийской «островодужной» Тагильской мегазоной, |
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