Geomorphic Signatures of Active Tectonic in Drainage Basins in the Southern Bolkar Mountain,Turkey |
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Authors: | Türkan Bayer Alt?n |
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Institution: | (1) Department of Primary School Teaching, Faculty of Education, Niğde University, Niğde, Turkey |
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Abstract: | Bolkar Mountain forms the northeast extent of the Central Taurus Mountains, which are located north of the eastern Mediterranean
Sea and consist of 3000 m or higher summits. The study area southern part of Bolkar Mt, has been investigated for geomorphic
signatures of active tectonics using Geographical information system (GIS). The lower valley floor-to-width to height and
elongation ratios, higher convexity, stream length-gradient (SL) indices, hypsometric integral and convex nature of the hypsometric
curves and topographic asymmetry show that relative tectonic activity is greater in the eastern sector affected by Ecemiş
fault. Spatial variations of tectonic activity along rivers studied point to a general trend of decreasing activity towards
the west as well as tectonic activity again increase in the west. Westward migration of basin and range extension is consistent
with the place of uplift in the southern Bolkar Mt. Topography of the southern sector is the result of Late Miocene-Early
Pliocene extension related uplift. Drainage systems in the upper part of the central and western sectors are under the lithological
control and karstic denudation; whereas the development of the drainage systems in the middle and outlet parts of all sectors
depend on sea level changes and Late Quaternary tectonism. The development of drainage systems of the eastern sector depends
mostly on fault tectonism and climatic changes in the Late Quaternary. |
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