Эоцен–олигоцендік тізбектің интеграциялық фациялық талдауы, палеоэкологиясы және диагенетикалық эволюциясы, Солтүстік Бахария ойысы, Мысыр: секвенциялық стратиграфиялық көзқарастар
DOI:
https://doi.org/10.32523/59fsh138Кілт сөздер:
фациялық талдау, диагенез, тізбекті стратиграфия, эоцен, олигоцен, Бахария ойысыАңдатпа
Бұл зерттеу Солтүстік Бахария ойысы, Батыс шөл, Мысырда ашылған эоцен–олигоценге жататын тізбектің седименттік фацияларын, палеоэкологиялық, секвенциялық және диагенетикалық ерекшеліктерін сипаттайды. Бұл эоцен–олигоцен тізбек бес стратиграфиялық бірліктен тұрады: негізінен жоғарыға қарай Naqb (ерте эоцен), Qazzun (орта эоцен) және El-Hamra (орта–кейінгі эоцен) формациялары, содан кейін Radwan (ерте олигоцен) және El-Ris (кейінгі олигоцен–миоцен?) формациялары орналасқан. Зерттелген эоцендік тау жыныстарынан бірнеше әртүрлі ірі бентикалық фораминифера және макрофауналық қауымдастықтар анықталып, экологиялық тұрғыда талданды. Лито-, био- және микрофациялық талдаулар нәтижесінде алты негізгі фациялық ассоциация анықталды, олар эоцендік жыныстарда перитидальды жазықтардан шектелген және сыртқы лагуналарға, рифтік ортаға дейінгі ауқымды көрсетсе, олигоцендік жыныстарда өзендік және беткей көлдік жерүсті ортаға сәйкес келеді. Зерттелген жыныстардағы ең жиі кездесетін диагенетикалық ерекшеліктер цементация, доломитизация, силиктизация, глауконитизация және темірмен алмастырудан туындаған болуы мүмкін.
Зерттелген эоцен–олигоцен тізбек екі негізгі жүйелік трактіден тұрады: төменгі жағында трангрессивтік жүйелік тракт, ал жоғары жағында регрессивтік жүйелік тракт орналасқан. Седименттік үрдістің трангрессивтік режимнен регрессивтік режимге ауысуы негізінен орналастыру орнының азаюы мен седименттің келу көлемінің артуына байланысты дамыған.
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