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

Yıl 1992, Cilt: 114 Sayı: 114, 1 - 22, 01.07.1992

Durmuş Boztuğ

Öz

 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.

Anahtar Kelimeler

LITHOSTRATIGRAPHIC, TECTONICS, SOUTHWESTERN

Kaynakça

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