Paleoclimatological approach to plio-quaternary paleosol-calcrete sequences in Bala and Gölbaşı (Ankara) by using mineralogical and geochemical proxies

Küçükuysal, Ceren
The major goal of this study is to define the paleoclimatic conditions in Ankara region during Plio-Pleistocene period by evaluating the mineralogical and geochemical proxies carried from the paleosols and their calcretes. The field observations, mineralogical, micromorphological, geochemical and stable isotope investigations were all conducted to achieve a paleoclimatic approach. As pedogenic minerals in calcretes, presence of dolomite with palygorskite in the Karahamzalı section and calcite with palygorskite in the Bala section together with high salinity and calcification values reveal the semi-arid and dry climatic conditions. The geochemical signatures of the paleosols are consistent with each other indicating low clastic input during the dry seasons favouring the formation of calcretes. The δ13C and δ18O values indicate the formation of calcretes from percolating soil-water under predominantly C4 to C3:C4 association type vegetation. Temperature calculations show that paleoclimatic conditions favouring the formation of calcretes in the region are semi-arid and seasonally dry with approximately 25°C soil depositional temperature. This study is the first to give both a radiometric age data to the calcretes of Central Anatolia, Ankara and document their stable isotope compositions. Dated calcretes having ESR ages of 419±69ka and 761 ±120ka point the formation during Middle Pleistocene when Mid-Brunches Event (MBE) was happened and the periodicity changed affecting the climatic control over the European continent. Like the Mediterranean calcretes, this study suggests that calcretes in the study area started to develop with MBE warmth between Marine Isotope Stages of 13- 11 and 19-17.


Neogene Kinematics of the Potwar Plateau and the Salt Range, NW Himalayan Front: A Paleostress Inversion and AMS study
Qayyum, Abdul; Poesse, Jorik Willem; Kaymakcı, Nuretdin; Langereis, Cornelis G.; Gülyüz, Erhan; Ahsan, Naveed (2021-06-01)
We provide new kinematic data from the Potwar Plateau (Pakistan) to evaluate the tectonic evolution of the region during the Neogene. The plateau is bound by two major strike-slip faults in the west and the east, accommodating its southwards translation. We have recognized two Neogene deformation phases in the plateau, based on paleostress inversion and Anisotropy of Magnetic Susceptibility (AMS) tensors. The first phase lasted until the early Pliocene and was characterized by vertical minor stress and N-S ...
Paleomagnetic evidence for an inverse rotation history of Western Anatolia during the exhumation of Menderes core complex
UZEL, BORA; Langereis, Cornelis G.; Kaymakcı, Nuretdin; SÖZBİLİR, HASAN; ÖZKAYMAK, ÇAĞLAR; Ozkaptan, Murat (2015-03-15)
Within the Aegean extensional system, the izmir-Balikesir Transfer Zone (IBTZ) is a crucial element in the late Cenozoic evolution of western Anatolia since it accommodates the differential deformation between the Cycladic and the Menderes metamorphic core complexes. Here, we determine the rotational history of western Anatolia using new paleomagnetic data from 87 sites in Miocene volcano-sedimentary rocks to better understand the role of the IBTZ. Our results reveal two discrete and opposite major rotation...
Paleomagnetism of the Miocene Soma basin and its structural implications on the central sector of a crustal-scale transfer zone in western Anatolia (Turkey)
Westerweel, Jan; UZEL, BORA; Langereis, Cornelis G.; Kaymakcı, Nuretdin; SÖZBİLİR, HASAN (Elsevier BV, 2020-05-15)
The Izmir-Balikesir Transfer Zone (IBTZ) is a crustal-scale major tectonic feature in western Anatolia accommodating differential extension between the Menderes (MCC) and Cycladic (CCC) core complexes. The kinematics and evolution of the southern part of the IBTZ are well constrained, but its northern continuation remains unstudied. This part is crucial in understanding the complete evolution of western Anatolian tectonics, as well as a possible link between the IBTZ and North Anatolian Fault Zone (NAFZ). I...
Palynostratigraphic and palynofacies investigations of the miocene units in the adana basin (Eastern Mediterranean, Turkey)
Türkecan, Aksel Tuğba; Department of Geological Engineering (2017)
The main purpose of this study is to investigate the palynostratigraphy and palynofacies of the Miocene Units in the Adana Basin (Eastern Mediterranean) and to establish a biostratigraphic framework for future studies. This study is a pioneering work in the Adana Basin, regarding the dinoflagellate cyst biostratigraphy. In this study, seven stratigraphic sections comprising the Köpekli, Cingöz, and Güvenç formations were measured and 482 samples were analyzed based on palynomorphs. According to the first an...
Extensional tectonics of SW Anatolia in relation to slab edge processes in the Eastern Mediterranean
Kaymakcı, Nuretdin; Özkaptan, Murat; Özacar, Atilla Arda; Uzel, Bora; Gülyüz, Erhan; Sözbilir, Hasan (null; 2017-12-14)
The tectonics of SW Anatolia is expressed in terms of emplacement of Lycian Nappes during the Eocene to Middle Miocene and synconvergent extension as part of the Aegean-West Anatolian extensional tectonic regime. Recent studies identified that there is a tear in the northwards subducting African Oceanic lithosphere along the Pliny-Strabo Trenches (PST). Such tears are coined as Subduction Transform-Edge Propagator (STEP) faults developed high angle to trenches. Hypothetically, the evolution of a STEP fault ...
Citation Formats
C. Küçükuysal, “Paleoclimatological approach to plio-quaternary paleosol-calcrete sequences in Bala and Gölbaşı (Ankara) by using mineralogical and geochemical proxies,” Ph.D. - Doctoral Program, Middle East Technical University, 2011.