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Stratigraphy and pre‐Miocene tectonic evolution of the southwestern part of the Sivas Basin, Central Anatolia, Turkey
Author(s) -
Dirik Kadir,
Göncüoğlu M. Cemal,
Kozlu Hüseyin
Publication year - 1999
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/(sici)1099-1034(199907/09)34:3<303::aid-gj829>3.0.co;2-z
Subject(s) - geology , ophiolite , cretaceous , paleontology , basement , geochemistry , tectonics , civil engineering , engineering
In central Anatolia there are several important basins developed mainly after closure of the northern branch of Neotethys. These are the Haymana, Tuzgölü, Ulukışla, Kızılırmak, Çankırı‐Çorum and Sivas basins. The Sivas Basin is located in the eastern part of central Anatolia between the Central Anatolian Crystalline Complex (CACC) in the north and Taurides in the south. The basement to the southeastern part of the basin consists of recrystallized limestone and clastics of the Permian–Lower Cretaceous Bünyan Metamorphics. These units are overlain by an Upper Cretaceous ophiolitic olistostrome that is overthrust by ophiolites and high pressure–low temperature metamorphic rocks. Lower Palaeocene cover units unconformably overlie this sequence. The basement to the northwestern part is constituted by CACC that includes a high temperature–low pressure polymetamorphic succession of Palaeozoic–Mesozoic age, overthrust by ophiolites and intruded by Upper Cretaceous post‐collisional granitoids and syenitoids. The uppermost Maastrichtian–Palaeocene continental to shallow marine (lagoonal) unit unconformably overlies this unit. Upper Cretaceous–Palaeocene siltstone, shale, pelagic limestone, volcaniclastic rocks and basic volcanic rock intercalations of a within‐continental‐plate eruptive setting have also been developed on the basement unit. These sequences represent the products of an extensional episode during Late Cretaceous–Palaeocene times in the region between the Taurides and CACC. The Middle Eocene is represented by a regional transgression which was followed by a compressional episode evidenced by thrust faults at the margins and continued regression in the central part of the basin. This compressional period continued up to the end of the Early Miocene. Units formed during this episode are overlain by Upper Miocene–Quaternary continental units intercalated with volcanic rocks formed in fault‐controlled extensional basins. It is suggested that the palaeotectonic events were the result of terminal closure of the northern branch of Neotethys. However, the neotectonic events are the result of the collision of the Arabian Plate and Anatolides which causes a westward escape of the Anatolian Plate. Copyright © 1999 John Wiley & Sons, Ltd.