Early Cretaceous sedimentation and orogeny on the active margin of Eurasia: Southern Central Pontides, Turkey

Date

2013-09-01

Author

Okay, Aral
Sunal, Gursel
Sherlock, Sarah
Altıner, Demir
Tuysuz, Okan
Kylander-Clark, Andrew R. C.
Aygel, Mesut

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

209
views

0
downloads

The Pontides in northern Turkey constituted part of the southern active margin of Eurasia during the Mesozoic. In the Early Cretaceous, a large submarine turbidite fan covered most of the Central Pontides. New U-Pb detrital zircon data imply that the major source of the turbidites was the East European Craton-Scythian Platform in the north. This implies that there was no thoroughgoing Black Sea basin between the Pontides and the East European Craton during the Early Cretaceous. The Lower Cretaceous turbidites are bounded in the south by a large metamorphic area, the Central Pontide Supercomplex (CPS). New geological mapping, petrology, and U-Pb zircon and Ar-Ar muscovite ages indicate that the northern part of the CPS consists of Lower Cretaceous distal turbidites deformed and metamorphosed in a subduction zone in the Albian. The rest of the CPS is made of Middle Jurassic, Lower Cretaceous, and middle Cretaceous (Albian) metamorphic belts, each constituting distinct subduction-accretion units. They represent episodes of collision of oceanic volcanic arcs and oceanic plateaus with the Eurasian margin and are marked in the stratigraphy of the hinterland by periods of uplift and erosion. The accretionary complexes are overlain by Upper Cretaceous (Turonian-Santonian) volcano-sedimentary sequences deposited in a fore-arc setting. The detrital zircon data, middle Cretaceous (Albian) metamorphism, and widespread Albian uplift of the Black Sea region suggest that Early Cretaceous (Barremian-Aptian) nonvolcanic rifting and Late Cretaceous (Turonian-Santonian) opening of the Black Sea by the splitting of the arc are unrelated events.

Subject Keywords

Geochemistry and Petrology, Geophysics

URI

https://hdl.handle.net/11511/40531

Journal

TECTONICS

DOI

https://doi.org/10.1002/tect.20077

Collections

Department of Geological Engineering, Article

Suggestions

OpenMETU
Core

Crustal velocity structure of Central and Eastern Turkey from ambient noise tomography Warren, Linda M.; Beck, Susan L.; Biryol, C. Berk; Zandt, George; Özacar, Atilla Arda; Yang, Yingjie (Oxford University Press (OUP), 2013-09-01) In eastern Turkey, the ongoing convergence of the Arabian and African plates with Eurasia has resulted in the westward extrusion of the Anatolian Plate. To better understand the current state and the tectonic history of this region, we image crust and uppermost mantle structure with ambient noise tomography. Our study area extends from longitudes of 32 degrees to 44 degrees E. We use continuous data from two temporary seismic deployments, our 2006-2008 North Anatolian Fault Passive Seismic Experiment and th...
Major Late Cretaceous Mass Flows in Central Turkey Recording the Disruption of the Mesozoic Continental Margin Okay, Aral; Altıner, Demir; Kylander-Clark, Andrew R. C. (American Geophysical Union (AGU), 2019-03-01) The newly recognized Upper Cretaceous (similar to 87Ma) olistostrome belt in central Turkey west of Ankara extends for more than 112 km subparallel to the Izmir-Ankara suture with a width of 10 km. The Alacaatl Olistostromes are stratigraphically underlain by a Triassic basement, and are up to 2 km thick. Over 80% of the blocks in the olistostromes consist of pelagic limestones, which reach up to 300 m in size; other blocks include basalt, chert, serpentinite, tuff, and sandstone. The limestone blocks are J...
Cretaceous Evolution of the Central Asian Proto-Paratethys Sea: Tectonic, Eustatic, and Climatic Controls Kaya, Mustafa Yücel; Dupont-Nivet, Guillaume; Proust, Jean-Noël; Roperch, Pierrick; Meijer, Niels; Frieling, Joost; Fioroni, Chiara; Altıner, Sevinç; Stoica, Marius; Aminov, Jovid; Mamtimin, Mehmut; Guo, Zhaojie (American Geophysical Union (AGU), 2020-09-01) The timing and mechanisms of the Cretaceous sea incursions into Central Asia are still poorly constrained. We provide a new chronostratigraphic framework based on biostratigraphy and magnetostratigraphy together with detailed paleoenvironmental analyses of Cretaceous records of the proto‐Paratethys Sea fluctuations in the Tajik and Tarim basins. The Early Cretaceous marine incursion in the western Tajik Basin was followed by major marine incursions during the Cenomanian (ca. 100 Ma) and Santonian (ca. 86 Ma...
The importance of fractional crystallization and magma mixing in controlling chemical differentiation at Suphan stratovolcano, eastern Anatolia, Turkey Ozdemir, Yavuz; Blundy, Jon; Güleç, Nilgün Türkan (Springer Science and Business Media LLC, 2011-09-01) Suphan is a 4,050 m high Pleistocene-age stratovolcano in eastern Anatolia, Turkey, with eruptive products consisting of transitional calc-alkaline to mildly alkaline basalts through trachyandesites and trachytes to rhyolites. We investigate the relative contributions of fractional crystallization and magma mixing to compositional diversity at Suphan using a combination of petrology, geothermometry, and melt inclusion analysis. Although major element chemistry shows near-continuous variation from basalt to ...
Late Cretaceous stratigraphy in the Mudurnu-Goynuk Basin (Turkey) and inferences on sea-level change in the Late Campanian to Early Maastrichtian Wolfgring, Erik; Wagreich, Michael; Yılmaz, İsmail Ömer; Liu Shasha, Liu Shasha; Boehm, Katharina (Geological Society of London, 2020-01-01) Upper Cretaceous strata at Goynuk, northwestern Anatolia, Turkey, provide a geological record of the Campanian-Maastrichtian from the Sakarya Terrane along the active Neotethys margin. Shales and shaly marls with siliciclastic and volcaniclastic intercalations indicate a pelagic palaeoenvironment rich in planktonic and benthonic foraminifera and calcareous nannofossil assemblages. A composite record from the Campanian to the Maastrichtian records nannofossil standard zones UC15c (CC21) to UC20a (CC26) as we...

Citation Formats

A. Okay et al., “Early Cretaceous sedimentation and orogeny on the active margin of Eurasia: Southern Central Pontides, Turkey,” TECTONICS, pp. 1247–1271, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40531.