Harita ve Kadastro Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12514/161

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Coğrafi Bilgi Sistem Analizleri Kullanılarak Toprak ve Arazi Özelliklerinin Değerlendirilmesi: Türkiye, Mardin İli Arazisi
(Siirt Üniversitesi, 2020) Mercan, Çağrı; Arpağ, Sezin
The purpose of the present study is to determine the soil and land characteristics and create databases by using Geographic Information Systems (GIS). For this purpose, the soil and land characteristics of Mardin Province, which is located in the Southeastern Anatolia Region of Turkey, which is part of so-called “Fertile Crescent” with fertile agricultural lands, were evaluated. The area that was included in the study was approximately 8633 km2, and the digital height model of the area was created by using the topography maps of Mardin Province. With the creation of these maps, the slope, aspect, elevation, relief maps, and the data created by the General Directorate of Village Services were collected and were drawn on the maps by calculating the spatial and areal rates of the area features in the GIS environment. All the maps drawn were placed on the created digital elevation map and examined and interpreted together with the topography data.. According to the data obtained as a result of the study, it was determined that 47.54% of the total area of Mardin Province has less than 6% slope values, and these areas are located mostly in the southern regions of the province. The most common soil types in Mardin province are brown forest soils with 43.65% and reddish-brown soils with 42.57%. In terms of the land usage, 38.81% of the province consists of pastures, and 25.38% consists of the shrubs. In terms of erosion, it was determined that 74.35% of the province has moderate, severe and very severe erosion risk. A total of 28.89% of the study area consists of I., II. and III. classes according to land capability. In terms of soil depth, 43.13% of the province has been found to have very shallow and shallow soil characteristics. It is determined that the lands where agricultural production is intensive in Mardin are mostly concentrated in regions with low altitude and slope values. It has been determined that the water problem in the region creates limitations in the product variety and erosion is among the most serious problems of the region. Elimination of these problems will contribute positively to the agricultural production of the region.
Citation - WoS: 20
Citation - Scopus: 20
Composition, pressure, and temperature of the mantle source region of quaternary nepheline-basanitic lavas in Bitlis Massif, Eastern Anatolia, Turkey: A consequence of melts from Arabian lithospheric mantle
(Elsevier, 2019) Mercan, Çağrı; Özdemir, Yavuz; Oyan, Vural; Atakul Özdemir, Ayşe
The Quaternary (0.66–0.63 Ma) nepheline basanites (ne - basanite) are the firstly observed volcanic products of Arabia-Eurasia collision on Bitlis Pötürge Massif. They composed of clinopyroxene, olivine, Ti-magnetite, Cr spinel, and nepheline. The forsterite compositions of olivines range between 73 and 83%, calcic clinopyroxenes show modest variations in Wo48–57-En37–45-Fs5–7 and nephelines occur as minor minerals within the networks of other groundmass minerals. They are characterized by low SiO2 (40.16–41.96 wt%), high MgO contents (8.54–9.73 wt%) and similar Srsingle bondNd isotopic compositions with Arabian Plate volcanics. Mineral and whole rock thermobarometry yield crystallization pressure and a temperature range between 8 and 20 kbar and 1301 °C – 1035 °C respectively. Lavas have high Mg-number (>0.58), high Cr and Ni contents and strong LREE enrichment but depletion in Rb, K, and Pb. Trace elements together with Sr isotopic compositions inferred negligible assimilation of the local upper crustal material. The calculated average pressure and temperature of mantle melting for ne-basanites is 2,85 kbar and 1353 °C respectively. FC3MS (wt% FeO/CaO-3*MgO/SiO2) parameter and melting models using REE data reveal Çatak basanites are products of amphibole and phlogopite bearing metasomatised lithospheric mantle in garnet stability field. They seem to originated from depths of ~ 85 km which corresponds to the base of the Arabian lithosphere in the region.
Güneydoğu Anadolu Bölgesindeki Orman Ve Yarı Doğal Alanların Zamansal Ve Mekânsal Değişiminin Coğrafi Bilgi Sistemleri İle Belirlenmesi
(Platanus Publishing, 2023) Mercan, Çağrı
Artan nüfus ile birlikte görülen göç hareketleri ve beraberinde gelişen olumsuz beşeri etkiler doğal kaynaklar ve arazi örtüsü üzerindeki baskıyı arttırmaktadır (Arslan ve Örücü, 2019). Bu olumsuz etkilerin sonucunda biyolojik çeşitlik zarar görürken, canlıların yaşam alanlarında değişimler meydana gelmektedir (Sarı ve Özşahin, 2016). Doğal kaynakların en önemlilerinden birisi orman ve yarı doğal alanlardır. Bu alanların insanlar için sosyal, ekonomik ve ekolojik birçok faydası varken, diğer pek çok canlının ise yaşam alanlarını oluşturmaktadır (Yılmaz vd., 2006). Son yıllarda etkisi belirgin bir şekilde görülen küresel ısınma canlıların termal konfor unsurlarını tehdit ederken yapılan çalışmalar yeşil alanların boş arazilere göre nispeten daha düşük yer yüzey sıcaklığına sahip olduğunu göstermektedir (Mercan, 2020). Doğal kaynaklar sınırlı olduğundan bu alanlar dikkatli bir şekilde yönetilmelidir Bundan ötürü doğal kaynakların mevcut durumlarının rasyonel bir şekilde belirlenip zamansal ve mekânsal değişimlerinin ortaya konulması arazi planlama çalışmaları açısından oldukça kritiktir
Citation - WoS: 3
Citation - Scopus: 4
Land Suitability Assessment for Pistachio Cultivation Using GIS and Multi-Criteria Decision-Making: A Case Study of Mardin, Turkey
(Springer, 2023) Mercan, Çağrı; Acıbuca, Veysi
Site selection for pistachio orchards is an important issue for sustainable agricultural policies, crop productivity, agricultural planning, and communities. This study aims to investigate suitable places for pistachio in the Mardin Province (SE Turkey) by considering several variables, such as meteorological data, topographic conditions, economic factors, and soil characteristics, using Geographic Information System (GIS) and Multi-Criteria Decision Analysis. Pistachio farmers, expert opinions, and literature data were used to determine the requirements for pistachio cultivation. Four main assessment criteria (thirteen sub-criteria), sixty value ranges, and fourteen exclusion criteria were determined for the pistachio land suitability assessment. The weighting of the evaluation criteria was calculated using the Analytical Hierarchy Process (AHP). Farmers and experts have stated that meteorological factors are more important than soil, topography, and economic factors. All data were transferred to the GIS environment, and a land suitability map was created using the weighted linear combination method. The results show that Mardin province has very suitable lands for pistachio cultivation. The resulting map determined that the 228,891.59 ha area in Mardin province is very suitable for pistachio. To evaluate the accuracy of the land suitability map generated for pistachio, the Receiver Operating Characteristic (ROC) curve was used. The value of the area under the curve (AUC) was calculated to be 0.806, which indicates that the study is consistent. The created suitability map will be an essential data source for developing sustainable agricultural strategies in the Southeastern Anatolia region.
Quaternary Basanitic Rocks within the Eastern Anatolian Volcanism (Turkey): Petrological and Geochemical Constrains
(19th EGU General Assembly, EGU2017, 2017) Özdemir, Yavuz; Mercan, Çağrı; Oyan, Vural; Atakul Özdemir, Ayşe
The Eastern Anatolian Cenozoic continental intraplate volcanism was initiated in Middle Miocene as a result of the convergence between the Arabian and Anatolian plates. The origin of Eastern Anatolian volcanism has been the focus of many petrological studies that have aimed to resolve the relative contributions of asthenospheric mantle and/or lithospheric mantle with/without subduction component in the genesis of magmas that compositionally have many affinities to ocean island basalts (OIB) and volcanic arcs. Volcanism in the region characterized by mainly stratovolcanoes, basaltic lava plateaus and are dominantly spread at the northern parts of Bitlis Pötürge Massif (BPM). Our study focuses on a small scale Quaternary basaltic system that firstly observed within the BPM. The volcanic rocks of our study located 50 km to the south of Lake Van and are basanitic in composition. They exposed along K–G striking tensional fissures and crosscut the Upper unit of the Bitlis Massif. Initial products of the volcanism are scoria fall deposits. Thick basanitic lava flows overly the pyroclastics and formed columnar structures. The basanites are generally fine-grained with phenocrysts of olivine+clinopyroxene. The groundmass is typically of clinopyroxene, olivine and Ti magnetite and Cr spinel with interstitial nepheline. The olivine phenocrysts are typically euhedral to subhedral with Forsterite contents of Fo73-83. Clinopyroxenes are highly calcic and show modest variations in Wo47-52-En34-42-Fs10-15 and are weakly zoned with mg# 89-87 at cores to 86-84 at rims. Nephelines occur as minor minerals within the networks of other groundmass minerals. Ti rich and Fe-Cr spinels occur as inclusions in olivine and clinopyroxenes as well as within the groundmass. LILE and LREE enrichments over HFSE and HREE suggest similarities with magmas generated from enriched mantle sources. EC-AFC modeling of trace element and isotope compositions indicates that assimilation of crustal lithologies have minor effect on the evolutionary stages of basanitic rocks. Based on LREE/HREE, MREE/HREE ratios and partial melting models, we suggest that basanitic rocks of Çatak are produced from a lower degree melting of a garnet bearing mantle source.

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