Моделирование процессов смешения расплавов перидотитового и мафического субстратов на малых глубинах континентальной метасоматизированной литосферной мантии. К вопросу о генезисе раннемелового вулканизма Восточной Монголии
DOI:
https://doi.org/10.21638/spbu07.2023.309Аннотация
Восточно-Монгольская вулканическая область сформировалась в позднем мезозое–раннем кайнозое в пределах Центрально-Азиатского складчатого пояса. Основные вулканические события в области произошли в раннем мелу, когда щелочно-базальтоидные лавы сформировали так называемый покровный вулканический комплекс. Изотопно-геохимические особенности данного комплекса позволили исследователям установить следующие мантийные породы в качестве его источника: метасоматизированные перидотиты, эклогиты и пироксениты. Чтобы определить, действительно ли одновременное плавление данных пород с последующими процессами кристаллизационной дифференциации могло привести к формированию вулканитов, было проведено термодинамическое моделирование в программе alphaMELTS. Результаты моделирования свидетельствуют о том, что плавление наиболее обогащенных несовместимыми редкими элементами перидотитов, эклогитов и пироксенитов не могло формировать расплавы покровного вулканического комплекса. В то же время, процессы смешения расплавов перидотитов и эклогитов в наибольшей степени соответствуют механизму формирования вулканитов. Однако обогащение вулканических пород Ti, K, P, Rb и Sr по отношению к моделируемым расплавам требует участия в процессах магмогенерации мантийных метасоматических жил, обогащенных рутилом, апатитом, флогопитом и амфиболом.
Ключевые слова:
Восточная Монголия, раннемеловой вулканизм, термодинамическое моделирование, эклогиты, пироксениты, мантийные метасоматические жилы
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