Carbonate sedimentation in an extensional active margin: Cretaceous history of the Haymana region, Pontides

Okay, Aral
Altıner, Demir
The Haymana region in Central Anatolia is located in the southern part of the Pontides close to the A degrees zmir-Ankara suture. During the Cretaceous, the region formed part of the south-facing active margin of the Eurasia. The area preserves a nearly complete record of the Cretaceous system. Shallow marine carbonates of earliest Cretaceous age are overlain by a 700-m-thick Cretaceous sequence, dominated by deep marine limestones. Three unconformity-bounded pelagic carbonate sequences of Berriasian, Albian-Cenomanian and Turonian-Santonian ages are recognized: Each depositional sequence is preceded by a period of tilting and submarine erosion during the Berriasian, early Albian and late Cenomanian, which corresponds to phases of local extension in the active continental margin. Carbonate breccias mark the base of the sequences and each carbonate sequence steps down on older units. The deep marine carbonate deposition ended in the late Santonian followed by tilting, erosion and folding during the Campanian. Deposition of thick siliciclastic turbidites started in the late Campanian and continued into the Tertiary. Unlike most forearc basins, the Haymana region was a site of deep marine carbonate deposition until the Campanian. This was because the Pontide arc was extensional and the volcanic detritus was trapped in the intra-arc basins and did not reach the forearc or the trench. The extensional nature of the arc is also shown by the opening of the Black Sea as a backarc basin in the Turonian-Santonian. The carbonate sedimentation in an active margin is characterized by synsedimentary vertical displacements, which results in submarine erosion, carbonate breccias and in the lateral discontinuity of the sequences, and differs from blanket like carbonate deposition in the passive margins.


Review of post-collisional volcanism in the Central Anatolian Volcanic Province (Turkey), with special reference to the Tepekoy Volcanic Complex
KUŞCU, GONCA; Geneli, Fatma (Springer Science and Business Media LLC, 2010-04-01)
Neogene-Quaternary post-collisional volcanism in Central Anatolian Volcanic Province (CAVP) is mainly characterized by calc-alkaline andesites-dacites, with subordinate tholeiitic-transitional-mildly alkaline basaltic volcanism of the monogenetic cones. Tepekoy Volcanic Complex (TVC) in Nigde area consists of base surge deposits, and medium to high-K andesitic-dacitic lava flows and basaltic andesitic flows associated with monogenetic cones. Tepekoy lava flows petrographically exhibit disequilibrium texture...
Microstructures of deformed grains in the augen gneisses of southern Menderes Massif (western Turkey) and their tectonic significance
Bozkurt, Erdin (Springer Science and Business Media LLC, 1997-04-01)
A detailed fabric and microstructural analysis of the granitic mylonites was carried out on the southern side of Besparmak Mountain north of Selimiye (Milas). The mylonitic augen gneisses have a blastomylonitic texture characterized by large retort-shape porphyroclasts or augen of feldspars, around which a more ductile, medium to fine-grained matrix of muscovite, biotite, quartz and feldspar is deflected. Feldspars behave in both plastic and brittle fashion, because size reduction occurs through grain bound...
Petrogenesis and tectonic setting of Cadomian felsic igneous rocks, Sandikli area of the western Taurides, Turkey
Guersu, Semih; Goencueoglu, M. Cemal (Springer Science and Business Media LLC, 2006-09-01)
In the Sandikli (Afyon) region, western Taurides, the Late Proterozoic rocks of the Sandikli basement complex are composed of low-grade meta-sedimentary rocks (Guvercinoluk Formation) intruded by felsic rocks (Kestel Cayi Porphyroid Suite, KCPS). The KCPS is a deformed and highly sheared, dome-shaped rhyolitic body with a granitic core. Quartz porphyry dikes intrude both the slightly metamorphic igneous and the sedimentary rocks of the basement complex. Both the quartz porphyries and rhyolites were converte...
Environmental geological and geotechnical investigations related to the potential use of Ankara clay as a compacted landfill liner material, Turkey
Met, İlker; Akgün, Haluk; Türkmenoğlu, Asuman Günal (Springer Science and Business Media LLC, 2005-01-01)
Clay-bearing Upper Pliocene red clastics and Quaternary alluvial deposits occupy the Ankara basin. The clayey levels of the Upper Pliocene deposits, referred to as Ankara clay, is considered as a source for compacted clay liners due to their low coefficients of permeability and widespread distributions throughout Ankara. This study investigates the geological, geotechnical and mineralogical properties of the founding clayey soils at two sites of the Ankara region. The geotechnical index properties along wit...
29 October 2007, Çameli earthquake and structural damages at unreinforced masonry buildings
Kaplan, H.; Yilmaz, S.; Akyol, E.; Sen, G.; Tama, Y. S.; Cetinkaya, N.; Nohutcu, H.; Binici, H.; Atimtay, E.; Sarisin, A. (Copernicus GmbH, 2008-8-26)
A recent earthquake of M=4.9 occurred on 29 October 2007 in C¸ ameli, Denizli, which is located in a seismically active region at southwest Anatolia, Turkey. It has caused extensive damages at unreinforced masonry buildings like many other cases observed in Turkey during other previous earthquakes. Most of the damaged structures were non-engineered, seismically deficient, unreinforced masonry buildings. This paper presents a site survey of these damaged buildings. In addition to typical masonry damag...
Citation Formats
A. Okay and D. Altıner, “Carbonate sedimentation in an extensional active margin: Cretaceous history of the Haymana region, Pontides,” INTERNATIONAL JOURNAL OF EARTH SCIENCES, pp. 2013–2030, 2016, Accessed: 00, 2020. [Online]. Available: