LITHOSTRATIGRAPHIC UNITS AND TECTONICS OF THE SOUTHWESTERN PART OF DADAY-DEVREKANİ MASSIVE, WESTERN PONTIDES, TURKEY

Metamorphic, magmatic and sedimentary rocks, outcropping in the southwestern part of Daday-Devrekani massive, were differentiated in to 12 lithostratigraphic units. The Precambrian Dorukyayla gneiss, comprising high-grade metasediments and dykes of asidic and intermediate composition, constitutes the basement. The Samatlar group, consisting of very low-grade metasediments Lower to Middle Paleozoic in age, unconformably overlies the Precambrian Dorukyayla gneiss. The Samatlar group, with a total thickness of approximately 4000 m , consists, from bottom to top, of the Yayladere (Cambrian), Dotla (Ordovician), Zirze (Silurian) and Kureihadit (Devonian) formations. The Permo-Triassic (?) Kirtulaz formation represents a broken formation structure which is composed of strongly faulted-crushed rocks. The Middle Jurassic Kürek granitoid, a plutonic body from the Kastamonu granitoid belt, is made up of granite, granodiorite, quartz monzonite and dykes of quartzolite, aplite and microdiorite. These units are overlain unconformably by the Yukarıköy and Çatak formations of Yaralıgöz group respectively represented by limestones and flyschoidal sediments with respective ages of Upper Jurassic-Lower Cretaceous and Lower Cretaceous. The Soğanlı formation of Middle Eocene age and the conglomerate-sandstone-siltstone-claystone alternation of the Cemalettin formation, Upper Eocene-Lower Oligocene in age, are unconformable, like the Yaralıgöz group, on the other units. Karabuzey formation of Neogene age, consisting of semi-consolidated and consolidated clastic rocks, is the youngest unit of the consolidated section The youngest unit in the mapped area is the Quaternary alluvium especially observed in the valleys. As for the structural elements, the foliation planes in the Precambrian Dorukyayla gneiss are interpreted to have been formed in a pre-Alpine period. All other structural elements such as folds, thrust and strike-slip faults are considered to have been formed synchronously with N-S compression after Lower Cretaceous. The main unconformities, also reflecting significant variances of ductile deformation, are observed between the Dorukyayla gneiss and Samatlar group and, between the Samatlar group and Yaralıgöz group.

Keywords:

LITHOSTRATIGRAPHIC, TECTONICS SOUTHWESTERN,

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ISSN: 0026-4563
Yayın Aralığı: Yılda 3 Sayı
Başlangıç: 1950
Yayıncı: Cahit DÖNMEZ

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