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Cengiz Cinku Mualla Heller Friedrich Ustaömer Timur 《International Journal of Earth Sciences》2017,106(7):2575-2592
International Journal of Earth Sciences - A paleomagnetic study of Cretaceous arc type rocks in the Central-Eastern Pontides and in the Southeastern Taurides investigates the tectonic and... 相似文献
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A Study on the Pollution and Water Quality Modeling of the River Buyuk Menderes,Turkey 总被引：1，自引：0，他引：1
Cengiz Koç 《洁净——土壤、空气、水》2010,38(12):1169-1176
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The importance of site-specific characters in prediction models for blast-induced ground vibrations 总被引：3，自引：0，他引：3
The aim of this study is to show the effect of geological factors in predicting the level of blast-induced ground vibrations. The site-specific character of ground must be involved in the prediction models especially if the ground conditions have a variable character like in this case. But in a blasting environment, this is only possible by using an empirical way. Towards this aim, an in-situ experimental study in a highly jointed sandstone quarry was carried out to incorporate the variable conditions into the prediction models. Therefore, 60 shots were organized and their ground vibrations monitored in two different directions to compare the results. These shots were normal production shots involving the true technological properties as well as geological properties into the prediction model. Based on these, the empirical relations between particle velocity, the amount of explosive and distance have been developed. The results show that the performances of these estimations depend on the site-specific character of these empirical relations. The best prediction was obtained with only 2.08% error level provided that the true technological and geological properties are involved. 相似文献
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Mehmet Yaman Muharrem Ince Ensar Erel Emine Cengiz Tulin Bal Cigdem Er Fevzi Kilicel 《洁净——土壤、空气、水》2011,39(6):530-536
The aim of this study is to investigate the concentrations of U, Th, V, Mo, and Zr in natural waters taken from Turkey. Among these water species, Lake Van is the largest soda lake and the fourth largest closed basin on Earth. The water samples were collected from 51 locations between 2008 and 2009. The inductively coupled plasma‐MS was used for determinations. The obtained U and Zr concentrations are in the range of 37–110 µg L?1 and 17–78 µg L?1 in Lake Van and 0.53–0.81 µg L?1 and 0.15–0.19 µg L?1 in Lake Hazar, respectively. The concentration of uranium in other studied waters varies from the lowest 0.09 µg L?1 in Tigris (Dicle) river to the highest 4.0 µg L?1 in Mediterranean Sea water. Mean Mo and V concentrations in the studied water samples were found to be in ranges of 0.1–17 and 2.7–113 µg L?1, respectively. The obtained highest U concentration in Lake Van correlates with the highest Mo and Zr levels compared to the Lake Hazar and river waters. These results imply that there is a young occurrence of uranium minerals around Lake Van. It is concluded that there is about 50.000 ton of uranium in Lake Van water. 相似文献
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Mualla Cengiz Çinku 《International Journal of Earth Sciences》2011,100(7):1633-1645
The Jurassic paleogeographic position of the Pontides is not well studied because of insufficient paleomagnetic data. For
this reason, a paleomagnetic study was carried out in order to constrain the paleolatitudinal drift of the Turkish blocks
during the Jurassic period. A total of 32 sites were sampled from volcanic and volcanoclastic rocks of the Lower/Middle Jurassic
Kelkit formation (Eastern Pontides), Mudurnu formation (Sakarya continent) and Upper Jurassic–Lower Cretaceous Ferhatkaya
formation exposed around Amasya region (Eastern Pontides). Rock magnetic experiments demonstrate that the main ferromagnetic
mineral is pseudo-single-domain titanomagnetite in these rocks. Paleomagnetic analysis revealed two main components of the
natural remanent magnetization during stepwise thermal and alternating field demagnetization. The first component is a low-coercivity
(unblocking temperature) component with a direction sometimes similar to that of the earth’s present field or a viscous component.
The second component, which is interpreted as the characteristic remanent magnetization (ChRM) direction, has low to high
coercivity properties between 20 and 100 mT or unblocking temperatures between 300 and 580°C. A positive fold test at the
95% level of confidence proved that the ChRM of the sites is primary. Paleomagnetic directions calculated for the Kelkit formation
in the Eastern Pontides have a mean direction of D = 334.8°, I = 49.7°, α
95 = 7.1° after tilt-correction. A mean direction of D = 332.2°, I = 48.5°, α
95 = 14.6° was obtained from the volcanoclastic rocks of the Mudurnu formation, and D = 324.3°, I = 43.3°, α
95 = 9.5° was calculated for the Upper Jurassic–Lower Cretaceous limestones/Ferhatkaya formation of the Amasya region. The Jurassic
rocks in the Eastern Pontides and Mudurnu region are considered to represent products of the rifted Neo-Tethys ocean, while
the Upper Jurassic–Lower Cretaceous sediments in Amasya are related to basin-filling materials. The data suggest that the
Kelkit formation was formed at 30.5°N paleolatitude and the equivalent Mudurnu formation at 29.5°N paleolatitude. The paleolatitude
of the Eastern Pontides indicates that this rifting block was separated from Eurasia by a marginal basin instead of being
a part of Eurasia. The lower paleolatitude of the Amasya region at 24.8°N in the Upper Jurassic to Lower Cretaceous clearly
indicates southward drift of the Turkish blocks during the Jurassic to Lower Cretaceous period together with the motion of
Eurasia. 相似文献
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M. Alkan M. Oruc Y. Yildirim D. Z. Seker K. Jacobsen 《Journal of the Indian Society of Remote Sensing》2013,41(3):587-596
Rapid land use/land cover changes have taken place in many cities of Turkey. Land use and land cover changes are essential for wide range of applications. In this study, Landsat TM satellite imageries date from 1987, 1993, 2000 and 2010 were used to analyse temporal and spatial changes in the Western Black Sea Region of Turkey. Zonguldak and Eregli two largest and economic important cities which have been active coal mining and iron fabric areas. Maximum Likelihood Classification technique was implemented and the results were represented in classes of open area, forest, agricultural, water, mining, urban and pollution in the sea. Urban areas on both cities increased from 1987 to 2010. The agricultural and open areas from 1987 to 2010 decreased in parallel to land use and land cover change in both cities. Meanwhile, forest areas increased continuously with about 20 % from 1987 to 2010 in both cities. As industrial activity, the coal fields doubled from 1987 to 2010. 相似文献
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