A sequence stratigraphic approach to the depositional history analysis of the upper eocene sedimentary succession, northwest of the thrace basin, Turkey

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2008
Sünnetçioğlu, Mehmet Akif
This study investigates the depositional history of the Late Eocene sedimentary record in the northwest of the Thrace Basin in a sequence stratigraphic approach and estimates the contribution of regional tectonics, basin physiography and eustasy. Late Eocene sedimentary succession was analyzed in two third-order sequences based on two major data sets; seismic reflection and well data sets. Depositional Sequence-1, represented by progradational stacking patterns, comprises the coarse-grained “Hamitabat” turbidite system. The base of the Sequence-1 was defined as the base of channel fill deposits in the northern shelf setting and the base of slope fan deposits in the slope setting. This boundary separates Lower-Middle and Upper Eocene sediments. In the slope setting, the “Hamitabat” turbidite system was analyzed in three major depocenters; Western, Northwestern and Northeastern depocenters respectively. “Hamitabat” turbidite system was controlled by the interaction of regional tectonics, basin physiography and eustatic fluctuations in the Late Eocene. This study highlighted the role of the regional variables; tectonic influence and basin morphology on the submarine canyon formation. The facies distribution was controlled by the high subsidence rate of sea-floor dominantly instead of eustasy. Depositional Sequence-2, represented by mostly retrogradational stacking patterns, is a clastic-carbonate mixed system. Depositional Sequence-2 was subdivided into three higher-order sequences. The lower sequence boundaries were induced by the rapid relative sea-level rise. The upper boundary of the Depositional Sequence-2 was defined as the termination of clastic-carbonate mixed system and a candidate for the Eocene-Oligocene contact.

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Citation Formats
M. A. Sünnetçioğlu, “A sequence stratigraphic approach to the depositional history analysis of the upper eocene sedimentary succession, northwest of the thrace basin, Turkey,” Ph.D. - Doctoral Program, Middle East Technical University, 2008.