Sedimentological characteristics and facies of the evaporite‐bearing Kirmir Formation (Neogene), Beypazari Basin, central Anatolia, Turkey

Abstract

A thick sedimentary sequence comprising fluvial, lacustrine and volcano‐sedimentary rocks is present in the Neogene Beypazari Basin, central Anatolia. These units display considerable lateral facies variation and interfinger with alkaline volcanic rocks along the north‐eastern margin of the basin. The uppermost Miocene Kirmir Formation contains numerous evaporite horizons. The evaporite sequence is up to 250 m thick and may be divided into four lithofacies. In ascending stratigraphical order these are: (1) gypsiferous claystone facies, (2) thenardite‐glauberite facies, (3) laminar gypsum facies and (4) crystalline gypsum facies. These facies interfinger with one another laterally along a section from the margins to central parts of the basin. The lithological and sedimentological features of the Kirmir Formation indicate fluvial, saline playa mudflat, hypersaline ephemeral playa lake and very shallow subaqueous playa lake depositional environments, which probably were influenced by alternating semi‐arid and evaporative conditions.

Sedimentology and geochemistry of the middle miocene playa lake evaporites in the Gürün basin (S of Sıvas), central Anatolia, Turkey

“…Recently, several papers dealing with the industrial minerals such as trona and bituminous shale were published (Helvaci 2001;Onal et al 2004Onal et al , 2006. Also the lithofacies of the Gurun Formation is interpreted as playa-lake type deposits similar to that of Eugster and Surdam (1973), Yagmurlu and Helvaci, (1994), Helvacl (1998) and Yarol et al (2005). Playa-lake deposition of the Green River Formation has been discussed and supported by various workers (Eugster and Hardie 1975;Surdam and Wolfbauer 1975;Lundell and Surdam 1975;Surdam and Stanley 1979).…”

Zircon ages from the Beypazarı granitoid pluton (north central Turkey): tectonic implications

“…The pluton is younger than the Triassic Tepeköy metamorphic unit into which it intruded and older than the Paleocene-Eocene deposits located unconformably above it (Göncüoğlu et al, 2000;Okay et al, 1996;Sayıt & Göncüoğlu, 2013;Yağmurlu & Helvacı, 1994). K-Ar hornblende ages are Late Cretaceous (82.9 ± 1.8, 79.4 ± 4.4, 77.7 ± 4.5 Ma) (Delaloye & Bingöl, 2000).…”

Stratigraphy, mineralogy and depositional environment of the evaporite unit in the Aşkale (Erzurum) sub-basin, Eastern Anatolia (Turkey)

“…These deposits consist of mainly gypsum, anhydrite, halite, thenardite, and glauberite (e.g., G€ okçe and Ceyhan, 1988;Çubuk, 1994;Ya gmurlu and Helvacı, 1994;Ceyhan, 1996;Gündo gan and Helvacı, 2001;Tekin et al, 2001;Çiner et al, 2002;Orti et al, 2002;Türkmen, 2004;Palmer et al, 2004;Gündo gan et al, 2005;Zeybek, 2007;Kırtıl, 2008;Yeş ilova and Helvacı, 2013). The Neogene basins and sub-basins in the Eastern Anatolia of Turkey between the _ IzmirEeAnkaraeErzincan and the AssyrianeZagros suture zones (Fig.…”