Structure of the Galatean Volcanic Province, Turkey

Abstract

The Galatean volcanic province (GVP), located in northwestern Anatolia, is an ENE-WSW-oriented belt. The province as a whole corresponds to a depression filled with volcanic and sedimentary rocks. The northern margin of the GVP is truncated by the North Anatolian fault, whereas it is surrounded by a continental sedimentary pile interfingering with volcanics on the south. Field and aerial photographic studies reveal that the GVP consists of several volcanic complexes scattered throughout the province. Nine of these complexes are recognized, each covering an area of hundreds of km 2 of circular or ellipsoidal form, with moderately to wellpreserved morphology. They include calderas, stratovolcanoes characterized by central vent(s), and radial flows of both lava and volcaniclastics. Several continental basins are disposed between the major volcanic complexes. These basins are isolated from one another or are partly connected and may differ in age and lithology. Available radiometric and paleontologic age determinations suggest that almost all volcanic complexes as well as the sedimentary basins started to develop during early to middle Miocene and continued to late Miocene time. The faults detected in the southern part of the province are Pliocene and older, and reflect normal faulting.

Saraçköy Volcanic Suite: implications for the subductional phase of arc evolution in the Galatean Arc Complex, Ankara, Turkey

“…Although the Galatean Arc Complex has been studied by many workers (Stchepinsky and Lahn 1941;Erol 1951Erol , 1954Erol , 1955Akyol 1969;Fourquin et al 1970;Ö ngür 1977;Ach 1982;Akyürek et al 1984;Kazanci and Gökten Copyright # 2003 John Wiley & Sons, Ltd. 1988; Tankut et al 1990;Türkecan et al 1991;Koçyi git 1991a, b;Keller et al 1992;Gökten et al 1996;Toprak et al 1996;Wilson et al 1997), not all the volcanic rocks and associated sedimentary intercalations in the volcanic plateau have yet been fully distinguished and mapped on a 1:25 000 scale. This paper therefore aims to draw attention to one of those hitherto unidentified exposures of accessible volcanic rocks, exposed on the southern side of the Galatean volcanic plateau, the Saraçköy Volcanic Suite.…”

“…Until recently, only Lower-Middle Miocene volcanic rocks and coeval continental sedimentary sequences were included in the so-called 'Galatean Volcanic Province', which was used for the stratigraphic column of Miocene volcanic rocks by Toprak et al (1996). At the same time Gökten et al (1996) suggested that, based on field studies in the south-southwestern part of the area, volcanic activity started in the Late Oligocene and evolved until the Early Pliocene.…”

“…The volcanic plateau comprises a sequence of 1500 m thick intermediate-acid lava flows (trachyandesites and dacites with minor rhyolites) and associated volcaniclastics with minor alkali basaltic flows. Also present are several isolated basins of varying size, which contain thick fluvio-lacustrine sedimentary infills interfingering with volcanic rocks (see Toprak et al (1996) and Wilson et al (1997) for lengthy discussions).…”

Palaeostress Inversion in a Multiphase Deformed Area: Kinematic and Structural Evolution of the Çankırı Basin (Central Turkey), Part 1 – Northern Area

“…In addition, the folds within the Upper Miocene units (near site 128) are perpendicular to crl. Tankut et al (1995) and Toprak et al (1996)]; 3, tncik Formation; 4, ~andlr Formation; 5, Tu~lu Formation; 6, S~eymanh Formation; 7, Bozklr Formation; 8, Deyim Formation; 9, alluvium; 10, syncline; 11, anticline; 12, overturned syncline; 13, thrust faults; 14, reverse faults; 15, normal faults; 16, strike-slip faults or faults with an unknown sense of movement; 17, photo-lineaments; 18, dextral strike-slip faults; 19, sinistral strike-slip faults; 20, dips of faults where they are best observed in the field; 21, sample site locations. Plots of fault planes: (b)-(e) fault planes, slickenlines and stress orientations for each site; (f)-(i) whole data in a particular phase and subarea (lower hemisphere equal area projections).…”

The early Miocene flora of Güvem (Central Anatolia, Turkey): a window into early Neogene vegetation and environments in the Eastern Mediterranean

“…1A), which belongs to the Pontide Tectonic Belt (Toprak et al 1996, Wilson et al 1997, Tankut et al 1998). The GVP evolved as a consequence of the collision of the Afro-Arabian and Eurasian plates (Rögl 1998).…”