Новые данные по минералогии и петрогеохимии щелочных пород козлиногорского комплекса (Уфалейский блок, Средний Урал)

A. I. Belkovsky, G. Yu. Shardakova, V. V. Kholodnov, V. N. Udachin, E. V. Konovalova

Аннотация


Щелочные комплексы, продуктивные на редкие металлы, на западном склоне Урала довольно редки. Породы козлиногорского комплекса приурочены к Уфалейскому блоку, находящемуся в зоне сочленения Урала и Восточно-Европейской платформы. Комплекс представлен габбро, сиенитами, граносиенитами и гранитами. Их щелочная специфика определяется наличием эгирина, рибекита, астрофиллита, энигматита. Породы характеризуются соотношениями редких элементов и особенностями флюидного режима, указывающими на участие в их генезисе мантийного плюма. Последний мог быть энергетическим и вещественным источником, инициирующим процесс растяжения в древних рифтовых структурах. Щелочные плюм-зависимые серии все чаще фиксируются на западном склоне Урала, указывая на существенную роль плюм-тектоники в геодинамике ранних этапов развития структуры.

Ключевые слова


щелочные комплексы; редкометалльное оруденение; рифтогенез; анорогенные граниты; петрогеохимия; плюм-тектоника

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Литература


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DOI: http://dx.doi.org/10.17072/psu.geol.17.4.308

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