Abstract
This study is the first to report the radiocarbon ages, mineralogical, morphological, geochemical and stable isotope compositions of calcretes from Neogene sediments around lakes Eymir and Mogan in the Gölbaşı Basin of Central Anatolia. Morphologically different forms of calcretes in the Gölbaşı Basin include powdery, nodular, fracture infill, laminar and hardpan types. Calcite is the dominant mineral of calcrete compositions; the diagnostic features of dessication cracks, random fractures, MnO linings and dense sparitic infillings are observed. Chemical analyses show arid conditions with mean annual precipitation of <50 mm. δ13C compositions of the calcretes range from -6.77‰ to -9.32‰ PDB, typical for most pedogenic calcretes, reflecting the development under seasonally arid climates and C3-dominated vegetation cover. δ18O values are between -5.57‰ and - 7.80‰ PDB, indicating the formation from meteoric water in a vadose zone environment. The results suggest that the Middle Pleistocene was arider and warmer, favouring the formation of palygorskite in association with the different forms of calcrete occurrences, whereas the Late Pleistocene was dryer and cooler, supporting the development of calcretes.
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Küçükuysal, C. Late Pleistocene calcretes from Central Anatolia (Lakes Eymir and Mogan, Gölbaşı Basin): Comparison to quaternary calcretes from Turkey. J. Earth Sci. 27, 874–882 (2016). https://doi.org/10.1007/s12583-016-0900-4
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DOI: https://doi.org/10.1007/s12583-016-0900-4