Calcareous nannofossils, planktonic foraminifera, and revised stratigraphy of the Eocene Çayraz Formation; the final stage of marine sedimentation in Central Anatolia, Turkey

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Turkish Journal of Earth Sciences Pub Date : 2023-01-01 DOI:10.55730/1300-0985.1825
A. O. Yücel, E. Özcan, R. Catanzariti, A. Hakyemez, A. Okay, T. A. Çiner, A. Akın
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引用次数: 2

Abstract

: New field observations and discovery of calcareous nannofossils and planktonic foraminifera from the ‘shallow-marine’ Çayraz Formation (Haymana Basin, Central Anatolia), a contributing Eocene section to the shallow benthic zonation (SBZ) in the Tethys, allow us to revise its stratigraphy and establish an integrated biostratigraphic scheme for the first time. The hemipelagic marls in the uppermost part of the Eskipolatlı Formation that underlies the Çayraz Formation yielded nannofossil assemblages of Zone CNE3, pinning down the initiation of the Çayraz shelf system into the ‘middle’ Ypresian. The prominent marly part (Member B) between the carbonate-clastic packages of the Çayraz Formation with prolific occurrences of larger benthic foraminifers (LBFs) (Members A below and C above) yielded calcareous nannofossils suggesting Zone CNE6 (late Ypresian). We show that the mixed carbonate-siliciclastic sequence with abundant LBFs in the upper part of the formation (Member C) is overlain by newly discovered hemipelagic marls (here named as Member D). These marls yielded calcareous nannofossils indicating Zone CNE9 and CNE10 for the lower and Zone CNE12(?Lutetian) for the upper samples. The same beds yielded planktonic foraminifers indicating Zone E8 for the lower and Zone E9 for the upper samples. We conclude that shallow-marine sedimentation in the Çayraz section ended in the ‘middle’ Lutetian, challenging the previous Bartonian records by LBFs. A new lithostratigraphic scheme consisting of four members with distinctive lithological and biotic characteristics is proposed for the Çayraz Formation: two main shelf systems (Members A and C), each followed by deep-marine sedimentation (Members B and D).
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始新世Çayraz组的钙质超微化石、浮游有孔虫和修订地层学;土耳其安纳托利亚中部海洋沉积的最后阶段
:对“浅海”Çayraz组(安纳托利亚中部Haymana盆地)钙质超微化石和浮游有孔虫的新的野外观测和发现,使我们能够首次修改其地层学并建立一个综合的生物地层学方案。位于Çayraz组下方的Eskipolalı组最上部的半远洋泥灰岩产生了CNE3区的超微化石组合,将Çaylaz陆架系统的形成锁定在“中”伊普雷阶。Çayraz组碳酸盐碎屑岩包之间的突出泥灰岩部分(成员B),大量出现大型底栖有孔虫(LBF)(以下成员A和以上成员C),产生钙质超微化石,表明为CNE6带(伊普雷阶晚期)。我们表明,在地层上部(成员C)具有丰富LBF的混合碳酸盐-硅碎屑岩序列被新发现的半远洋泥灰岩覆盖(此处命名为成员D)。这些泥灰岩产生了钙质超微化石,表明下部样品为CNE9区和CNE10区,上部样品为CNE12区(?Lutetian)。同一层产生浮游有孔虫,下层样品显示E8区,上层样品显示E9区。我们得出的结论是,Çayraz剖面的浅海沉积在“中”卢特阶结束,挑战了LBF之前的Bartonian记录。Çayraz组提出了一个新的岩石地层方案,由四个具有独特岩性和生物特征的成员组成:两个主要陆架系统(成员A和C),每个系统后面都是深海沉积(成员B和D)。
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来源期刊
Turkish Journal of Earth Sciences
Turkish Journal of Earth Sciences 地学-地球科学综合
CiteScore
2.40
自引率
10.00%
发文量
6
审稿时长
6 months
期刊介绍: The Turkish Journal of Earth Sciences is published electronically 6 times a year by the Scientific and Technological Research Council of Turkey (TÜBİTAK). It is an international English-language journal for the publication of significant original recent research in a wide spectrum of topics in the earth sciences, such as geology, structural geology, tectonics, sedimentology, geochemistry, geochronology, paleontology, igneous and metamorphic petrology, mineralogy, biostratigraphy, geophysics, geomorphology, paleoecology and oceanography, and mineral deposits. Contribution is open to researchers of all nationalities.
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