First micropalaeontological record from the early and middle Eocene Mamuca Formation of the Dümrek Basin, western Central Anatolia, Turkey: Biostratigraphy, depositional history and palaeoclimate

2021 ◽  
pp. 105036
Author(s):  
Mehmet Serkan Akkiraz ◽  
Atike Nazik ◽  
Nazire Özgen-Erdem ◽  
Sariye Duygu Durak
Keyword(s):  
Middle Eocene ◽  
Central Anatolia ◽  
Depositional History

Geological Correlation Between Northern Cyprus And Southern Anatolia

2021 ◽  
Author(s):  
Yucel Yilmaz
Keyword(s):  
Carbonate Platform ◽  
Middle Eocene ◽  
Source Region ◽  
Oceanic Lithosphere ◽  
Late Eocene ◽  
Central Anatolia ◽  
Late Cenozoic ◽  
Ophiolitic Mélange ◽  
South Central ◽  
Northern Cyprus

The island of Cyprus constitutes a fragment of southern Anatolia separated from the mainland by left-oblique transtension in late Cenozoic time. However, a geological framework of offset features of the south-central Anatolia, for comparison of Cyprus with a source region within and west of the southeastern Anatolian suture zone, has not yet been developed. In this paper, I enumerate, describe, and compare a full suite of potentially correlative spatial and temporal elements exposed in both regions. Northern Cyprus and south-central Anatolia have identical tectonostratigraphic units. At the base of both belts, crop out ophiolitic mélange-accretionary complex generated during the northward subduction of the NeoTethyan Oceanic lithosphere from the Late Cretaceous until the end of middle Eocene. The nappes of the Taurus carbonate platform were thrust above this internally chaotic unit during late Eocene. They began to move as a coherent nappe pile from that time onward. An asymmetrical flysch basin was formed in front of this southward moving nappe pile during the early Miocene. The nappes were then thrust over the flysch basin fill and caused its tight folding. Cyprus separated from Anatolia in the Pleistocene-Holocene when, transtensional oblique faults with dip-slip components caused the development of the Adana and Iskenderun basins and the separation of Cyprus from Anatolia.

Cyclicity in the Middle Eocene Yamak turbidite complex of the Haymana basin, Central Anatolia, Turkey

1996 ◽  
Vol 85 (4) ◽  
pp. 669-682
Author(s):  
Attila Çiner ◽  
Max Deynoux ◽  
Erdal Kosun
Keyword(s):  
Middle Eocene ◽  
Central Anatolia

Sedimentary Cyclicity in the Upper Paleocene- Eocene Successions of the Haymana Basin (Ankara, Turkey): Responses of Fossils to Cyclicity

2020 ◽  
Author(s):  
Nilya Bengül
Keyword(s):  
Depositional Environment ◽  
Middle Eocene ◽  
Planktonic Foraminifera ◽  
High Energy ◽  
Central Anatolia ◽  
Accretionary Wedge ◽  
Depositional Model ◽  
Stratigraphic Sequence ◽  
Large Benthic Foraminifera ◽  
Upper Paleocene

<p>The Haymana Basin in central Anatolia (Turkey) formed during the closure of the Neo-Tethys on Late Cretaceous to Middle Eocene as a forearc accretionary wedge. Late Paleocene to Middle Eocene aged units in this basin are exposed near Çayraz Village, Haymana. The Çayraz Formation is the youngest unit of the Haymana Basin, and it is represented by packages of nummulitic banks, and the intercalation of calcareous mudstones. The aim of this study is to investigate the sedimentary cyclicity and depositional sequences in the Upper Paleocene- Eocene successions of the Haymana Basin. To be able to achieve this objective, a stratigraphic section has been measured through this succession. In this study, detailed microfacies analyses of the shallow-water carbonate successions indicate a ramp type depositional model of the carbonate rocks. The facies composed of Alveolina sp., Orbitolites sp., and  Miliolids that indicate low energy depositional environment . After that depositional environment to  the shoal; the facies composed of Nummulites spp., Assilina spp. occur and increase their abundance towards high-energy environments. Absence of the Alveolina sp., Orbitolites sp., and Miliolids. occur in accordance with that. The facies composed of Nummulites spp., Assilina spp. become associated with Discocyclina sp. towards to open sea on the ramp, and the shallow open marine part is represented by the shale with the association of planktonic foraminifera. Lateral relationships of the facies from proximal (inner ramp) to the distal (mid ramp) part of the ramp are investigated by using the knowledge of paleoecology preferences of the fossils, lithologic data of the rocks and biological aspects of the fossils.  The fossil associations and their indicator environments can be used in vertical changes of the facies as in the lateral relationships of the facies. It has potential to derive cyclic relationships of the stratigraphic sequence. Therefore, based on the detailed microfacies analysis and change in the distribution of the fossil associations in the stacking pattern of the sequence, a composite depositional model has been suggested. At this part of the research newly acquired question is that the driven factor of these cyclic relationships of the sequence, whether it occurred by the control of the eustatic sea- level or the interplay between tectonics and the eustacy as the dominating factor in the sequence formation.</p><p> </p><p>Keywords: Large Benthic Foraminifera, Nummulites spp., Assilina spp., Haymana Basin, Çayraz Formation</p>

scholarly journals Planktonic and benthic foraminiferal biostratigraphy of the Middle Eocene–Lower Miocene successions from the Sivas Basin (Central Anatolia, Turkey)

2016 ◽  
Vol 67 (1) ◽  
pp. 21-40 ◽  
Author(s):  
Aynur Hakyemez ◽  
Nazire Özgen-Erdem ◽  
Özgen Kangal
Keyword(s):  
Water Column ◽  
Benthic Foraminifera ◽  
Middle Eocene ◽  
Planktonic Foraminifera ◽  
Central Anatolia ◽  
Successive Interval ◽  
Lower Miocene ◽  
Sivas Basin ◽  
Algal Reef ◽  
Foraminiferal Biostratigraphy

AbstractPlanktonic and benthic foraminifera are described from the Middle Eocene-Lower Miocene successions in the Sivas Basin, Central Anatolia. An integrated foraminiferal zonation provides new age assignments in terms of a great number of taxa for the studied sections. Four biostratigraphical intervals are first recorded based on the concurrent ranges of sporadically occurring but well preserved planktonic foraminiferal assemblages. The first interval characterized by the co-occurrences ofAcarinina bullbrooki, Truncorotaloides topilensisandTurborotalia cerroazulensisis referable to the E11 Zone of late Lutetian–early Bartonian. An assemblage yieldingParagloborotalia opimaaccompanied byGlobigerinella obesaforms a basis for the late Chattian O5 Zone. The successive interval corresponds to the late Chattian O6 Zone indicated by the presence ofGlobigerina ciperoensisandGlobigerinoides primordiusalong with the absence ofParagloborotalia opima. The early Aquitanian M1 Zone can be tentatively defined based mainly on the assemblage ofGlobigerina, Globigerinella, GloboturborotalitaandTenuitella. The biostratigraphical data obtained from the benthic foraminifera assign the studied sections to the SBZ 21–22, SBZ 23 and SBZ 24 ranging in age from Rupelian to Aquitanian. The SBZ 23 and 24 are well constrained biozones by the occurrences ofMiogypsinella complanataandMiogypsina gunteri, respectively, whereas the SBZ 21–22 defined by nummulitids and lepidocylinids in the Tethyan Shallow Benthic Zonation is characterized dominantly by peneroplids, soritids and miliolids in the studied sections. Benthic foraminiferal assemblages suggest different paleoenvironments covering lagoon, algal reef and shallow open marine whereas planktonic foraminifera provides evidence for relatively deep marine settings on the basis of assemblages characterized by a mixture of small-sized simple and more complex morphogroups indicative for intermediate depths of the water column.

Cyclicity in the Middle Eocene Çayraz Carbonate Formation, Haymana Basin, Central Anatolia, Turkey

1996 ◽  
Vol 121 (3-4) ◽  
pp. 313-329 ◽  
Author(s):  
Atilla Çiner ◽  
Max Deynoux ◽  
Stéphanie Ricou ◽  
Erdal Kosun
Keyword(s):  
Middle Eocene ◽  
Central Anatolia ◽  
Carbonate Formation

scholarly journals Re-evaluation of the Mentelle Basin, a polyphase rifted margin basin, offshore south-west Australia: new insights from integrated regional seismic datasets

2011 ◽  
Vol 3 (1) ◽  
pp. 65-103
Author(s):  
D. Maloney ◽  
C. Sargent ◽  
N. G. Direen ◽  
R. W. Hobbs ◽  
D. R. Gröcke
Keyword(s):  
Middle Eocene ◽  
Data Interpretation ◽  
Alternative Interpretation ◽  
Seismic Survey ◽  
Data Sets ◽  
Borehole Data ◽  
Depositional History ◽  
Basement Faults ◽  
Subsidence History ◽  
Degree Of Confidence

Abstract. Vintage 2-D (two dimensional) seismic reflection surveys from the sparsely explored Mentelle Basin (western Australian margin) have been re-processed and integrated with recent high quality seismic survey, and stratigraphic borehole data. Interpretation of these data sets allows the internal geometry of the Mentelle Basin fill and depositional history to be reanalysed with a greater degree of confidence. Basin stratigraphy can be subdivided into several seismically defined megasequences, separated by major unconformities related to both the Valanginian breakup between India-Madagascar and Australia-Antarctica, and tectonically-driven switches in deposition through the Albian. Resting on the Valanginian unconformity are several kilometre-scale mounded structures that formed during late Jurassic to early Cretaceous extension. These have previously been interpreted as volcanic edifices, although direct evidence of volcanic feeder systems is lacking. An alternative interpretation is that these features may be carbonate build-ups. The latter interpretation carries significant climatic ramifications, since carbonate build-ups would have formed at high palaeolatitude, ~60° S. Soon after breakup, initial subsidence resulted in a shallow marine environment and Barremian-Aptian silty-sandy mudstones were deposited. As subsidence continued, thick Albian ferruginous black clays were deposited. Internally, black clay megasequences show previously unresolved unconformities, onlapping and downlapping packages, which reflect a complex depositional, rifting and subsidence history, at odds with their previous interpretation as open marine sediments. Southwestwards migration of the Kerguelen hotspot led to thermal contraction and subsidence to the present day water depth (~3000 m). This was accompanied by Turonian-Santonian deposition of massive chalk beds, which are unconformably overlain by pelagic Palaeocene-Holocene sediments. This substantial unconformity is related to the diachronous breakup and onset of slow spreading between Australia and Antarctica, which may have led to the reactivation and inversion of basement faults, followed by rapid seafloor spreading from the middle Eocene to the present.

Sign in / Sign up

Export Citation Format

Share Document