Late Eocene evolution of the ?i?ekda?? Basin (central Turkey): Syn-sedimentary compression during microcontinent-continent collision in central Anatolia

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• 作者：Erhan G¨¹ly¨¹z ; Nuretdin Kaymakci ; Maud J.M. Meijers ; Douwe J.J. van Hinsbergen ; C?me Lefebvre ; Reinoud L.M. Vissers ; Bart W.H. Hendriks ; A. Ahmet Peynircio?lu
• 关键词：Central Anatolia ; Sedimentary basin ; Continent&ndash ; continent collision ; Magnetostratigraphy ; Geochronology ; Eastern Mediterranean
• 刊名：Tectonophysics
• 出版年：2013
• 出版时间：16 August, 2013
• 年：2013
• 卷：602
• 期：Complete
• 页码：286-299
• 全文大小：9297 K

文摘

The Central Anatolian Crystalline Complex (CACC) exposes metasediment rocks overlain by Cretaceous ophiolites and intruded by granitoids. Following late Cretaceous exhumation of its high-grade metamorphic rocks, the CACC started to collide with the Central Pontides of southern Eurasia in the latest Cretaceous to Paleocene. Here, we present the sedimentary, stratigraphic and tectonic evolution of the ?i?ekda?? Basin, located in the northwest of the CACC. Magnetostratigraphic dating, supported by ⁴⁰Ar/³⁹Ar geochronology, shows a late Eocene basin age. The basin fill unconformably overlies metamorphic basement in the south and ophiolites of the CACC in the north. It consists of red conglomerates, sandstones and siltstones, which overlie a sequence of nummulitic limestones. In the south, these limestones are ~ 10 m thick, are underlain by a few meters of conglomerate unit unconformably covering the CACC metamorphics. In the north, the limestones are underlain by a ~ 200 m thick sequence of volcanics and fine-grained clastics intercalating with shallow marine black shales. The upper Eocene sediments of the ?i?ekda?? Basin were deformed into a syn-anticline pair. Progressive unconformities in the northern flank and a rapid and persistent ~ 180¡ã switch in paleocurrent directions from southward to northward in the southern flank of the anticline demonstrate syn-sedimentary folding. We interpret the folding to result from a southward progression of the ?ank?r? foreland basin as a result of ongoing collision between the CACC and the Pontides.