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Geologische Rundschau

, 85:669 | Cite as

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

  • Attila Çiner
  • Max Deynoux
  • Erdal Kosun
Original Paper

Abstract

The Haymana basin in central Anatolia (Turkey) formed on a Late Cretaceous to Middle Eocene fore-arc accretionary wedge. A sequential model is proposed for the 1-km-thick Lutetian Yamak turbidite complex (YTC) which is the youngest paleotectonic unit of the basin. The YTC represents a prograding submarine fan subdivided into three depositional sequences (DS), each several hundred meters thick. Each depositional sequence consists of a turbidite system (TS), with sandstone and conglomeratic sandstone beds alternating with mudstones, overlain by basin plain mudstones. In each turbidite system, the sandstone and mudstone sequential organization allows the distinction of smaller subdivisions, namely, basic sequences (BS) and basic units (BU), with each basic sequence being composed of several basic units. This subdivision, associated with a two-dimensional geometric reconstruction of the YTC, leads to a better understanding of the evolution in time and space of the submarine fan system. Lower to middle fan depositional lobes, and upper fan and slope channels, are represented. As a whole, the YTC progressed from a sand-poor to a sand-rich system. Depositional sequences (DS) of the YTC may correspond to third-order sea-level cycles of tectonic origin. Accordingly, fourth- and fifth-order cycles might be proposed for the BS and BU, respectively. However, partly because of the limited extent of exposures, the allocyclic origin of these finer subdivisions remains problematic.

Key words

Turbidites Submarine fan Sequence stratigraphy Fore-arc basin Eocene Turkey 

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  1. 1.Geological Engineering DepartmentHacettepe UniversityAnkaraTurkey
  2. 2.Centre CNRS de Géochimie de la SurfaceInstitut de GéologieStrasbourg, CedexFrance
  3. 3.General Directorate of Mineral Research and Exploration (MTA)AnkaraTurkey

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