ВЛИЯНИЕ МОЩНОСТИ ОКЕАНИЧЕСКОЙ КОРЫ НА СТИЛЬ СУБДУКЦИИ В РАННЕМ ДОКЕМБРИИ ПО РЕЗУЛЬТАТАМ ЧИСЛЕННОГО ПЕТРОЛОГО-ТЕРМОМЕХАНИЧЕСКОГО МОДЕЛИРОВАНИЯ

Эклогитизация магматических пород океанической коры играет ключевую роль в механизме движения литосферных плит. Этот эффект (как и его кинетическая задержка) особенно важен в докембрийской субдукции, когда мощность океанической коры могла в несколько раз превышать современную. В данной работе приводятся результаты численного моделирования субдукции под континент при повышенной (на ΔT=150–250 °C относительно современной) потенциальной температуре мантии, отвечающей раннему докембрию, с разной мощностью океанической коры, в которых учитывается дискретная эклогитизация пород ее базальтового и габброидного слоев, а также деплетирование мантии. Моделирование впервые показало, что мощность океанической коры оказывает существенное влияние на режим докембрийской субдукции. Для моделей с толстой корой (18–24 км) при всех значениях ΔT наблюдается пологая субдукция. Для моделей с тонкой корой (7 км) пологая субдукция отмечается лишь при ΔT=250 °C, тогда как при ΔT=150–200 °C пологое погружение происходит только на начальных этапах субдукции, а затем реализуется стиль крутой субдукции, сопровождающейся откатом слэба и магматизмом на активной окраине с преобладанием кислого магматизма над базитовым. На основе этих данных предполагается, что зоны с современным стилем крутой субдукции (или близким к нему) могли возникать в раннем докембрии там, где погружались плиты с маломощной (близкой к современной) океанической корой.

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