Please use this identifier to cite or link to this item: https://hdl.handle.net/11499/51066
Title: Post-Variscan autochthonous cover in the eastern Sakarya Zone, Turkey: Evolution of the late Carboniferous back-arc ocean to the Triassic Karakaya Ocean
Authors: Dokuz, Abdurrahman
Alcicek, Mehmet Cihat
Tuncdemir, Vahdet
Kandemir, Raif
Aydınçakır, Emre
Keywords: late Carboniferous
Autochthonous cover
eastern Sakarya Zone
Paleotethys
Back -arc basin migration
Geodynamics
Anatolide-Tauride Block
Yusufeli-Artvin Area
West-African Craton
Ne Turkey
Southern Margin
Volcanic-Rocks
Hf Isotopes
Nw Turkey
Geochronological Evidence
Geochemical Constraints
Publisher: Pergamon-Elsevier Science Ltd
Abstract: The processes that caused removal of the upper Carboniferous to Permian sediments in the eastern Sakarya Zone, Turkey, are modeled by using of geochemical data and LA-ICP-MS U-Pb ages from detrital zircons. A felsic provenance and passive margin setting during the deposition of the upper Carboniferous catalces</n>me sediments are inferred from the geochemistry of sandstones (SiO2 > 85 wt%). Chemical Index of Alteration (CIA) values (75 - 81) indicate warm and humid climatic conditions and tectonic tranquility during deposition. Fifty-three (58%) concordant zircon grains produce a youngest age population in the range of 308.7 +/- 4.4 to 342.1 +/- 6.9 Ma, typical for the Variscan events. The burgundy color and upward-fining in clast size and bed thickness are the most prominent features of the concordantly overlying Hardis</n>i Formation. Geochemistry (SiO2 = 66-81 wt%) and CIA values (58-65) of the clastic rocks point to a subduction-related tectonic setting and increasing rate of erosion in the source area. We highlight that the catalces</n>me sediments were deposited in a back-arc basin opened to the south of a continental ribbon separated from Gondwana. Approaching of the Paleotethyan mid-ocean ridge to the subduction zone was resulted in flattening in subducting slab, which in turn caused the back-arc basin to migrate into the interior parts of Gondwana and the former back-arc basin to evolve into a lacustrine setting. Increase in the elevation of source areas was resulted in an increase in the rate of physical erosion and trans-portation of burgundy Hardis</n>i clastic sediments into the lacustrine basin.
URI: https://doi.org/10.1016/j.jseaes.2023.105621
https://hdl.handle.net/11499/51066
ISSN: 1367-9120
1878-5786
Appears in Collections:Mühendislik Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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