Syn-Sedimentary Tectonic Markings in the Oligocene Datça-Kale-Aci Göl Basin, Western Anatolia

Abstract

In southwest Turkey, the Oligocene sedimentary sequence is located on the Datça-Kale-Acı Göl basin between the Menderes Massif and Lycian nappes. To understand the nature of this basin is important for tectonic models that explain the exhumation of the Menderes massif. In the northeast extension of this basin, the sedimentary sequence is interpreted as alluvial fan, fan-delta, beach, marine input, inner shelf carbonates and offshore deposits. The Oligocene Datça-Kale main breakaway fault bounding the south eastern margin of the basin is represented by İnceler and Acı Göl faults in the study area. The wedge geometry of the sequence thickening towards the İnceler normal fault is an evidence of syn-tectonic deposition. The northwest margin of the basin is controlled by two en-echelon faults. The sedimentary sequence has a wedge geometry thickening towards the normal fault and at the same time its upper layers overlap the fault. As a result, the northeast extension of the Datça-Kale-Acı Göl Oligocene basin is an elongated fjord like depositional area containing the shallow marine environments controlled by normal faults located in its southeast and northwest margins. It was demonstrated that the southeast basin margin limited by the Datça-Kale main breakaway fault performed dominant tectonic control. The similar kinematic indicators that is used for the model explaining the exhumation of the Menderes massif by the upward bending of Datça-Kale main breakaway fault are also observed in the northwest of the basin as top to the north-northeast.

Alaşehir type - rolling hinge mechanism in the northern margin of Büyük Menderes Graben: Evidence from seismic reflection and recent thermochronological data

“…The advantage of the first stage asymmetrical exhumation of the Menderes massif (Seyitoğlu et al, 2004;Seyitoğlu and Işık, 2015) is to explain (1) the Oligocene sedimentary basin formation in SW Türkiye (see also Elmas et al, 2019); (2) the dominant top-to-the north sense of shear over the entire Menderes massif; (3) the controversial transport directions of the Lycian nappes (i.e. Bozkurt and Park, 1999;Collins and Robertson, 2003;Rimmele et al, 2003) in SW Türkiye.…”

Recent alluvial fan developments in Muğla (SW Turkey)

“…Roberts et al (2019) found catchment erosion during the intense human land use that decrease forest area, more sediment supply to the Nar Lake in the Central Anatolia. SW Turkey includes several grabens filled by the Neogene to Quaternary deposits (Alçiçek et al 2005;Bozkurt and Mittwede 2005;Sözbilir 2005;Rojay et al 2005;Süzen et al 2006;Alçiçek 2007;Sümer et al 2012;Özkaymak et al 2013;Seyitoğlu and Işık 2015;Sümer et al 2018;Elmas et al 2019). Similar to the Muğla Polje, several settlements were marked on top of the alluvial fan, fluvial deposits such as the Söke town (Sümer et al 2012), Ödemiş, Tire, Kiraz, Bayındır towns (Rojay et al 2005) in north of the Muğla.…”

“…They can be found in different ages and in diverse tectonic regimes such as normal fault and strike slip fault in Turkey (Brückner 2019;Kayan 2019;Kuzucuoğlu 2019;Kuzucuoğlu et al 2019aKuzucuoğlu et al , 2019bOcakoğlu 2020;Öner 2019;Özsayın et al 2019;Sarıkaya et al 2015;Şaroğlu and Güngör 2019). SW Turkey hosts four different types of basins during the Neogene-Quaternary; piggyback basin, pull-apart basin along oblique strike-slip faults, intermontane basin, and graben (Görür et al 1995;Bozkurt and Mittwede 2005;Sözbilir 2005;Alçiçek 2007;Gürer et al 2013;Seyitoğlu and Işık 2015;Elmas et al 2019). The alluvial fan, colluvial, and fluvial deposits are found in the Çameli Basin in the SW of Muğla (Alçiçek et al 2005;Alçiçek 2007); in the Gediz and Küçük Menderes Grabens (Süzen et al 2006;Rojay et al 2005); in the Manisa Basin of western end of the Gediz Graben (Özkaymak et al 2013); and in the Söke-Milet Basin in western end of the Büyük Menderes Graben in the N of Muğla (Sümer et al 2012).…”