Интегрированный анализ фаций, палеоэкология и диагенетическая эволюция эоцен–олигоценовой толщи, северная часть впадины Бахария, Египет: последовательностные стратиграфические перспективы
DOI:
https://doi.org/10.32523/59fsh138Ключевые слова:
фациальный анализ, диагенез, последовательная стратиграфия, эоцен, олигоцен, впадина БахарияАннотация
Это исследование описывает осадочные фации, палеоэкологические, последовательностные и диагенетические особенности эоцен–олигoценовой толщи, обнаженной в северной части впадины Бахария, Западная пустыня, Египет. Эта эоцен–олигoценовая толща состоит из пяти стратиграфических единиц: снизу вверх Naqb (ранний эоцен), Qazzun (средний эоцен) и El-Hamra (средний–поздний эоцен), за которыми следуют формации Radwan (ранний олигоцен) и El-Ris (поздний олигоцен–миоцен). Из изученных эоценовых пород было идентифицировано несколько различных сообществ крупных бентосных фораминифер и макрофауны, интерпретированных с экологической точки зрения. Анализ лито-, био- и микрофаций позволил выделить шесть основных фациальных ассоциаций, отражающих диапазон от перитидальных равнин до ограниченных и внешних лагун, рифовых сред эоценовых пород и речных и мелководных озерных наземных сред олигоценовых пород. Наиболее часто встречающиеся диагенетические особенности в изученных породах, вероятно, связаны с цементацией, доломитизацией, силификацией, глауконитизацией и замещением железом.
Изученная эоцен–олигoценовая толща включает два основных системных тракта: трангрессивный системный тракт внизу, за которым вверх следует регрессивный системный тракт. Смена осадконакопления от трангрессивного к регрессивному режиму в основном развивалась в ответ на постепенное уменьшение пространства для осадконакопления и увеличения поступления осадков.
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