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Papers by MUHAMMED OZTURK

Journal of Cave and Karst Studies

Karst depressions and relict valleys, formed as a result of the combination of karst and fluvial ... more Karst depressions and relict valleys, formed as a result of the combination of karst and fluvial processes, are characteristic landforms of the Taurus karst region in Turkey. Development of these two landforms is interrelated, and the main aim of this study is to explain the role of paleovalley networks on morphometric properties of the depressions. For this purpose, in this study, spatial distribution of karst depressions and relict valleys, and morphometric properties of depressions are investigated on the Ermenek Plateau based on 1:25,000-scaled, topographic maps. About 10,000 karst depressions are mapped, 49.5 % and 50.5 % of them being located in and out of relict valleys, respectively. According to morphometric calculations, there are significant differences in dimensional properties of the two groups of depressions. Mean area, perimeter, short and long axes of relict valley depressions are 2.6, 1.6, 1.6 and 1.4 times larger, respectively, than plateau depressions. Relict valley depressions and plateau depressions are elliptical-and circular-shaped, respectively. Relict valley density has positive effect, while non-relict valley density has negative effect (limiting factor) on spatial distribution of depression density.

Sedimentary …, 2011

This paper focuses on the cement characteristics and optical luminescence age of late Pleistocene... more This paper focuses on the cement characteristics and optical luminescence age of late Pleistocene-Holocene beachrock, exposed on the southeast shore of freshwater Lake İznik in northwest Turkey, based on field observations, various spectroscopic analyses and optical dating results. The studied beachrock is a poorly-sorted coastal conglomerate composed mostly of gravels derived from surrounding volcanic rocks and marbles as well as quartz and carbonate grains. We identified different types of cements; dominated by micritic envelopes, bladed isopachous aragonite rims, void fills, radial aggregates and meniscus bridges, implying no single origin. Cementation characteristics indicate that marine-like cement micro-fabrics may occur in freshwater lake environments where the lake-water chemistry favors carbonate precipitation. OSL data revealed the existence of older beachrock dating back to 20.2 ka, together with younger Holocene-age beachrock of between 5.6 and 2.4 ka. This suggests that younger beachrocks have been superimposed on older cemented carbonates through the removal of carbonates by wave motion (splash and spray) during lower lake level conditions.

Journal of Cave and Karst Studies

Karst depressions and relict valleys, formed as a result of the combination of karst and fluvial ... more Karst depressions and relict valleys, formed as a result of the combination of karst and fluvial processes, are characteristic landforms of the Taurus karst region in Turkey. Development of these two landforms is interrelated, and the main aim of this study is to explain the role of paleovalley networks on morphometric properties of the depressions. For this purpose, in this study, spatial distribution of karst depressions and relict valleys, and morphometric properties of depressions are investigated on the Ermenek Plateau based on 1:25,000-scaled, topographic maps. About 10,000 karst depressions are mapped, 49.5 % and 50.5 % of them being located in and out of relict valleys, respectively. According to morphometric calculations, there are significant differences in dimensional properties of the two groups of depressions. Mean area, perimeter, short and long axes of relict valley depressions are 2.6, 1.6, 1.6 and 1.4 times larger, respectively, than plateau depressions. Relict valley depressions and plateau depressions are elliptical-and circular-shaped, respectively. Relict valley density has positive effect, while non-relict valley density has negative effect (limiting factor) on spatial distribution of depression density.

Sedimentary …, 2011

This paper focuses on the cement characteristics and optical luminescence age of late Pleistocene... more This paper focuses on the cement characteristics and optical luminescence age of late Pleistocene-Holocene beachrock, exposed on the southeast shore of freshwater Lake İznik in northwest Turkey, based on field observations, various spectroscopic analyses and optical dating results. The studied beachrock is a poorly-sorted coastal conglomerate composed mostly of gravels derived from surrounding volcanic rocks and marbles as well as quartz and carbonate grains. We identified different types of cements; dominated by micritic envelopes, bladed isopachous aragonite rims, void fills, radial aggregates and meniscus bridges, implying no single origin. Cementation characteristics indicate that marine-like cement micro-fabrics may occur in freshwater lake environments where the lake-water chemistry favors carbonate precipitation. OSL data revealed the existence of older beachrock dating back to 20.2 ka, together with younger Holocene-age beachrock of between 5.6 and 2.4 ka. This suggests that younger beachrocks have been superimposed on older cemented carbonates through the removal of carbonates by wave motion (splash and spray) during lower lake level conditions.