A composite biostratigraphy (mainly calpionellids and foraminifera) of the Upper Jurassic–Lower Cretaceous Carbonates in Sivrihisar region (Pontides, NW Turkey): Delineation of the J-K boundary in a slope environment

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2017-10-08

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Atasoy, Serdar Görkem
Altıner, Demir

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A 748 m thick stratigraphical section was measured along the Upper Jurassic – LowerCretaceous carbonate sequence exposed in a tectonic klippe of the Sakarya Zone(Pontides), north of Sivrihisar. According to the biozonation and microfacies types, twocoeval but dissimiliar rock successions, separated by a thrust fault, have been detected. Thelower succession displays a slope to basin facies and consists of the Kimmeridgian–Berriasian Yosunlukbayırı Formation and the overlying Valanginian Soğukçam Limestone.The deposits of this succession are characterized by the continuous pelagic backgroundsedimentation with taxa including calpionelldis, Saccocoma, calcareous dinocysts andaptychi, intercalated with the calciturbidites containing platform derived clasts (benthicforaminifera, microencrusters, worm tubes etc.). The succession commences with pelagicdeposits characterized by toe-of-slope type facies. There is an important increase in theamount of platform-derived clasts in the Tithonian, reflecting a calciturbiditic – slope typedeposition in the succession. Latest Tithonian onward the background pelagic conditionsdominate the deposition.This facies evolution resulted in intervals dominated by neritic or pelagic taxa orcharacterized by mixed fauna. This types of bio-association gave rise to a compositebiozonation that is based on both pelagic and benthic taxa, providing the link between slopeand platform successions. This biozonation consists of the following biozones: Globuligerinaoxfordiana–Mohlerina basiliensis Zone (Kimmeridgian), Saccocoma Zone (LowerTithonian), Protopeneroplis ultragranulata Zone (Upper Tithonian), Crassicollaria(massutiana subzone) Zone (uppermost Tithonian), Calpionella (alpina, Remaniella, ellipticasubzones) Zone (Lower Berriasian), Calpionellopsis (simplex, oblonga subzones) Zone(Upper Berriasian) and Calpionellites (darderi subzone) Zone (Lower Valanginian).Calciturbiditic deposits of the P. ultragranulata Zone are followed by pelagic deposits of themassutiana subzone in the latest Tithonian. The Jurassic-Cretaceous boundary is locatedat the base of the overlying alpina subzone defined by the acme of Calpionella alpina. Theother observed calpionellid bioevents around the J-K boundary are the stepwise lastoccurences of Crassicollaria intermedia (below the boundary), Calpionella elliptalpina (at theboundary) and Crassicollaria brevis (at the boundary) and the marked decrease in theabundance of Calpionella grandalpina across the Tithonian-Berriasian boundary.

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https://hdl.handle.net/11511/98082

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10th ISC – International Symposium on the Cretaceous

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Department of Geological Engineering, Conference / Seminar

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Citation Formats

S. G. Atasoy and D. Altıner, “A composite biostratigraphy (mainly calpionellids and foraminifera) of the Upper Jurassic–Lower Cretaceous Carbonates in Sivrihisar region (Pontides, NW Turkey): Delineation of the J-K boundary in a slope environment,” presented at the 10th ISC – International Symposium on the Cretaceous, Vienna, Avusturya, 2017, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/98082.