Пластическое течение и реоморфическая дифференциация вещества в мантийных ультрамафитах

D. E. Saveliev, V. B. Fedoseev

Аннотация


Рассмотрены основные закономерности строения ультрамафитовых массивов офиолитовой ассоциации, которые принято считать фрагментами верхней мантии, выведенными на современный эрозионный срез в результате тектонических процессов. Показано, что главной тенденцией изменения состава и структуры мантийных пород является их стратификация, сопровождающаяся обособлением реологически наиболее «слабых» агрегатов – дунитовых тел, которые часто являются вмещающими породами для хромовых руд. На основе проведенного анализа сформулированы аргументы, не позволяющие принять существующие гипотезы петро- и рудогенеза в верхней мантии. Разработана оригинальная реоморфическая модель дифференциации мантийного вещества, опирающаяся на термодинамический подход, позволяющая разрешить проблемы и противоречия, возникающие при использовании классических моделей (магматической и метасоматической).

Ключевые слова


ультрамафиты; пластическое течение; стратификация; реоморфическая сегрегация

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Литература


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DOI: http://dx.doi.org/10.17072/psu.geol.25.22

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