Mineral-geochemical description and spatial distribution of weakly altered rocks in central part of the Ukrainian shield

• Main Authors: B. N. Ivanov, І. І. Mihalichenko
• Format: Article
• Language: English
• Published: Ukrainian State Geological Research Institute (UkrSGRI) 2015-06-01
• Series: Мінеральні ресурси України
• Subjects: area; diaphthorite; weakly altered rock; chlorite; epidote; alkaline sodium metasomatite; crystalline foundation; ukrainian shield
• Online Access: https://mru-journal.com.ua/index.php/mru/article/view/80
• ISSN: 1682-721X; 2707-8698

The mineral-geochemical description and spatial distribution of weakly altered rocks, that are described at the level of erosive cut of crystalline foundation in central part of the Ukrainian shield, the origin of which paragenetically are related to formation of hydrothermal- metasomatite’s rocks (mainly uraniferous alkaline natrium metasomatites) in the zones of deep faults have been presented in this article. It has been shown on the example of apogranitic metasomatite’s columns, that on mineral-geochemical features weakly altered granites of the Central-Ukrainian uranium ore district occupy intermediate position between the unchanged granites and apogranitic albite-microcline’s syenitelike metasomatites (intermediate zone of alkaline sodium metasomatite’s column). It is set that the area of weakly altered rocks depends on the grade of tectonic fault, here in the places of crossing with faults of other directions the area of him increases. Uranium alkaline natrium metasomatites Central-Ukrainian and Kirovohrad uranium ore district are on an area with the most total area of halos of weakly altered rocks, which is estimated in 1 950 км2. Structural position of the area is determined to the zone of crossing ortogonal and diagonal systems of deep faults of the earth’s crust.