--> Abstract: Forearc Basins with Rudists in the Central Anatolia, Turkey, by S. Ozer; #90987 (1993).

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OZER, SACIT, Dokuz Eylul Universitiesi, Bornova, Izmir, Turkey

ABSTRACT: Forearc Basins with Rudists in the Central Anatolia, Turkey

Although numereous forearc basins have been well studied from

divers regions of the world, Cretaceous example with rudists has only been exposed in the Carribean. On the other hand, the rudist frameworks associated with submarine volcanism have also been reported from some regions such as Guyots of Mid-Pacific and Sicily.

The Haymana, Tuzgolu and Cankiri basins were constructed in the Ankara region (Central Anatolia) due to the continued convergence and eventual collision of the Rhodope-Pontide fragment, Sakarya continent, Taurus block and Kirsehir block in the northern Turkey, which allows to present Upper Cretaceous forearc basins with rudists for the first time in the Mediterranean province.

In the Ankara region, the forearc sequence unconformably overlies the Anatolian Complex characterizing by the highly sheared ophiolitic units.

During the Late Cretaceous, the flysch type shales and sandstones with planktonic Foraminifers and some rudistid limyfloat-stones accumulated in the interiors of Haymana and Tuzgolu basins while in the shallowest margins of the basins, from bottom to top, the terrestrial cross-bedded red clastics, shallow-marine cross-bedded rudistid limestones and cross-bedded volcanic sandstones and continental debris-flow clastics also deposited.

In the Cankiri basin, the forearc sequence consists of, in ascending order, the volcanoclastic conglomerates, rudistid sandy limestones and terrestrial red clastics.

The evolutions of the Haymana, Tuzgolu and Cankiri basins during the late Campanian to the late Paleocene, imply that accretionary type of forearc basins with rudists developed at the active margin of North Neo-Tethys in the Ankara region.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.