ДО ПИТАННЯ ПРО ВІК МАРГАНЦЕВОРУДНИХ ШАРІВ НІКОПОЛЬСЬКОГО БАСЕЙНУ (РАННІЙ ОЛІГОЦЕН, УКРАЇНА)
DOI:
https://doi.org/10.30836/igs.2522-9753.2023.295240Ключові слова:
марганцева руда, Нікопольський басейн, стратиграфія, форамініфери, остракоди, диноцисти, спори та пилок, Україна, біостратиграфія, ранній олігоценАнотація
Формування гігантських ранньоолігоценових марганцеворудних родовищ периферії Східного Паратетису вважають наслідком кардинальних подій на межі еоценової і олігоценової епох і ініціального олігоцену. Активно розвивається ідея синхронності формування цих родовищ. У статті уточнено стратиграфічне положення та час формування марганцеворудних відкладів Нікопольського басейну Південної України на основі біостратиграфічних даних за молюсками, форамініферами, остракодами, органікостінним мікропланктоном, спорою та пилком. Стратиграфічне положення рудоносних відкладів визначено у вузькому перехідному інтервалі між зонами диноцист Phthanoperidinium amoenum/Wetzeliella symmetrica – Wetzeliella gochtii, в межах нанопланктонної зони NP22, зони форамініфер Spiroplectammina oligocenica, зони остракод Cuneocythere marginata та зони молюсків Flabellipecten stettenensis пшехського регіоярусу нижнього олігоцену Східного Паратетису. Формування марганцеворудних відкладів (підрудного, рудного і надрудного шарів) відбувалося у ранньому рюпелі (32,8–32,0 млн років тому) після еоцен-олігоценової межі, приблизно на 1,1 млн років пізніше, та після ранньоолігоценового льодовикового максимуму (кліматичної події Оі-1), під час ранньорюпельської глобальної трансгресії. Вперше проведено біостратиграфічне дослідження марганцеворудних шарів Нікопольського басейну за комплексами органікостінного мікропланктону (диноцитів) та остракод. Отримані нові дані дозволяють уточнити стратиграфічне положення рудоносних верств у регіональній стратиграфічній схемі палеогенових відкладів Південної України та співвіднести їх з регіональною стратиграфією олігоцену Східного Паратетису.
Посилання
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