Noble metal geochemistry of the Mesoproterozoic igneous complexes Bashkirian meganticlinorium and the eastern edge of the East European Platform

Abstract

First described the noble metal (platinum group elements (PGE) and Au) geochemical specialization of magmatic rocks of Bashkirian meganticlinorium and the adjacent part of the East European Platform (EEP). Identity graphs of normalized PGE and Au contents in igneous rocks of the western slope of the Southern Urals and east EEP indicates the proximity of their formation and common mechanisms of formation of noble metal geochemical specialization during the formation of these bodies. It was found that the specific precious metal geochemical specialization (“rhodium anomaly”) magmatic complexes Bashkirian meganticlinorium and east EEP, due to the content of precious metals in sulphide minerals (pentlandite) has a “primary” nature. Variations contents Pt, Pd and Au, which are characteristic for different varieties of common species within the region, are the result of their redistribution during the formation of magmatic bodies and/or transformation by secondary processes. It is shown that the noble metal geochemical specialization of clastic rocks of Bashkirian meganticlinorium tectonic zones (presence of increased amounts of platinum and most importantly - “rhodium anomaly”) formed under the influence of magmatism with further redistribution and concentration of precious metals as a result of a later time metamorphism and local metasomatism.

Keywords

• башкирский мегантиклинорий
• восточно-европейская платформа
• магматические комплексы
• пикриты
• долериты
• терригенные породы
• элементы платиновой группы
• золото
• сульфидные минералы
• bashkirian meganticlinorium
• east-european platform
• magmatic complexes
• picrites
• dolerite
• clastic rocks
• platinum group elements
• gold
• sulphide minerals