Cretaceous and Triassic subduction-accretion, high-pressure-low-temperature metamorphism, and continental growth in the Central Pontides, Turkey
2006-01-01

Research Article| September 01, 2006 Cretaceous and Triassic subduction-accretion, high-pressure–low-temperature metamorphism, and continental growth in the Central Pontides, Turkey A.I. Okay; A.I. Okay 1Istanbul Teknik üniversitesi, Avrasya Yerbilimleri Enstitüsü, Maslak, Istanbul 34469, Turkey Search for other works by this author on: GSW Google Scholar O. Tüysüz; O. Tüysüz 1Istanbul Teknik üniversitesi, Avrasya Yerbilimleri Enstitüsü, Maslak, Istanbul 34469, Turkey Search for other works by this author on: GSW Google Scholar M. Satır; M. Satır 2Institut für Geowissenschaften, Universität Tübingen, Wilhelmstraße 56, D-72074 Tübingen, Germany Search for other works by this author on: GSW Google Scholar S. Özkan-Altiner; S. Özkan-Altiner 3Middle East Technical University, Department of Geology, Ankara 06531, Turkey Search for other works by this author on: GSW Google Scholar D. Altiner; D. Altiner 3Middle East Technical University, Department of Geology, Ankara 06531, Turkey Search for other works by this author on: GSW Google Scholar S. Sherlock; S. Sherlock 4Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA, UK Search for other works by this author on: GSW Google Scholar R.H. Eren R.H. Eren 5Anadolu Yerbilimleri Ltd. Şirketi, Perpa Ticaret Merkezi, No. 1955, Okmeydani, Istanbul, Turkey Search for other works by this author on: GSW Google Scholar Author and Article Information A.I. Okay 1Istanbul Teknik üniversitesi, Avrasya Yerbilimleri Enstitüsü, Maslak, Istanbul 34469, Turkey O. Tüysüz 1Istanbul Teknik üniversitesi, Avrasya Yerbilimleri Enstitüsü, Maslak, Istanbul 34469, Turkey M. Satır 2Institut für Geowissenschaften, Universität Tübingen, Wilhelmstraße 56, D-72074 Tübingen, Germany S. Özkan-Altiner 3Middle East Technical University, Department of Geology, Ankara 06531, Turkey D. Altiner 3Middle East Technical University, Department of Geology, Ankara 06531, Turkey S. Sherlock 4Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA, UK R.H. Eren 5Anadolu Yerbilimleri Ltd. Şirketi, Perpa Ticaret Merkezi, No. 1955, Okmeydani, Istanbul, Turkey Publisher: Geological Society of America Received: 22 Nov 2005 Revision Received: 03 Mar 2006 Accepted: 19 Mar 2006 First Online: 08 Mar 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 Geological Society of America GSA Bulletin (2006) 118 (9-10): 1247–1269. https://doi.org/10.1130/B25938.1 Article history Received: 22 Nov 2005 Revision Received: 03 Mar 2006 Accepted: 19 Mar 2006 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation A.I. Okay, O. Tüysüz, M. Satır, S. Özkan-Altiner, D. Altiner, S. Sherlock, R.H. Eren; Cretaceous and Triassic subduction-accretion, high-pressure–low-temperature metamorphism, and continental growth in the Central Pontides, Turkey. GSA Bulletin 2006;; 118 (9-10): 1247–1269. doi: https://doi.org/10.1130/B25938.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Biostratigraphic, isotopic, and petrologic data from the Central Pontides document major southward growth of the Eurasian continental crust by subduction-accretion during the Cretaceous and Triassic Periods. A major part of the accreted material is represented by a crustal slice, 75 km long and up to 11 km thick, consisting of metabasite, metaophiolite, and mica schist that represent underplated Tethyan oceanic crustal and mantle rocks. They were metamorphosed at 490 °C and 17 kbar in mid-Cretaceous time (ca. 105 Ma). The syn-subduction exhumation occurred in a thrust sheet bounded by a greenschist facies shear zone with a normal sense of movement at the top and a thrust fault at the base. A flexural foreland basin developed in front of the south-vergent high-pressure–low-temperature (HP-LT) metamorphic thrust sheet; the biostratigraphy of the foreland basin constrains the exhumation of the HP-LT rocks to the Turonian–Coniacian, ∼20 m.y. after the HP-LT metamorphism, and ∼25 m.y. before the terminal Paleocene continental collision. The Cretaceous sub-duction-accretion complex is tectonically overlain in the north by oceanic crustal rocks accreted to the southern margin of Eurasia during the latest Triassic–earliest Jurassic. The Triassic subduction-accretion complex is made up of metavolcanic rocks of ensimatic arc origin and has undergone a high pressure, greenschist facies metamorphism with growth of sodic amphibole. Most of the Central Pontides consists of accreted Phanerozoic oceanic crustal material, and hence is comparable to regions such as the Klamath Mountains in the northwestern United States or to the Altaids in Central Asia. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.