Yazar "Sener, Mehmet Furkan" seçeneğine göre listele

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    Current status and potentials of enhanced geothermal system in the Eastern Pontide Orogenic Belt, Turkey
    (Diponegoro Univ, 2024) Sener, Mehmet Furkan
    The radioactive decay of isotopes is one of the most important sources of heat in the Earth's interior. The main radiogenic elements in the crust are U, Th, and K in granitoids. Radiogenic granites are becoming increasingly important as they support the development of the renewable energy sector. This study provides an in-depth review of the development of Enhanced Geothermal Systems (EGS) technology. Many countries, such as France and the UK, have initiated and contributed to energy production using EGS technology. In addition, this study calculates the potential production capacity of radiogenic granites in the Eastern Pontide Oraganic Belt (EPOB) and assesses their significant contribution to the Turkish economy in line with the Sustainable Development Goals (SDGs). The total area of radiogenic granites within the EBOP is 7116.35 km 2 and these granites contain average concentrations of U 3.25 ppm, Th 16.44 ppm, and K 3.7%. The plutons studied can generally be classified as medium to low heat producing granitoids. Ayeser, Camibo & gbreve;az & imath;, and Ayder (3.36-6.98 mu W/m 3 ), which are close to the average heat production value of the continental crust (5 mu W/m 3 ), may be suitable areas for EGS. Currently, EBOP granites have the capacity to produce 61 x 109 kWh of electricity. In addition to electricity, heat from granites can be used for other applications such as space heating and greenhouse cultivation.
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    Hydrogeochemical and rare earth element properties of geothermal waters and the use of abandoned oil wells in Diyarbakır
    (Springer, 2024) Sener, Mehmet Furkan
    T & uuml;rkiye is one of the most tectonically active regions in the world. Diyarbak & imath;r, which was chosen as the study area, is located in the south-eastern Anatolian region of T & uuml;rkiye and also in the south of the Bitlis-Zagros Suture Zone (BZSZ). Some of the geothermal resources in Diyarbak & imath;r are actively exploited. The temperature of & Ccedil;ermik geothermal waters was recorded at 40-51 degrees C by MTA (General Directorate of Mineral Research and Exploration) between 2010 and 2014. However, subsequent measurements conducted following the Kahramanmara & scedil; earthquake (Mw: 7.7 on 6 February 2023) revealed that the surface temperature of geothermal fluids had increased to between 52 and 56 degrees C. Previous studies have indicated that there are also many abandoned oil wells in the region where the wellhead temperatures are around 107 degrees C. As a result of hydrogeochemical analyses, deep circulating geothermal waters such as & Ccedil;ermik have Na-HCO3 composition, while shallow circulating and mixed cold surface waters such as & Ccedil;& imath;nar, Bismil and Sur have Na-Ca-Cl-HCO3 composition. According to the chalcedony geothermometer results, the reservoir temperatures in the study area vary between 90 degrees C and 173 degrees C. REY (Rare Earth Elements and Yttrium) results show that geothermal fluids in the study area have negative cerium (Ce), europium (Eu) and yttrium (Y) anomalies. The negative Ce anomaly indicates that the colder aquifers are close to oxygen-rich surface waters and thermal fluids interact with Karacada & gbreve; volcanic rocks. Eu anomalies in groundwater are controlled by preferential mobilisation of Eu2+ during water-rock interaction compared to Eu3+, and negative Eu anomalies indicate leakage of geothermal fluids from granites. The Y/Ho values of the thermal fluids in the study area are between 30 and 40. This value is due to the active contribution of fluorine during the mobilisation of REY as a fluoride or fluorocarbonate ligand complex, causing Y to behave as a heavy pseudolanthanide. delta 18O and delta 2H isotope values show that the geothermal waters in the study area are of meteoric origin. The obtained results reveal that Diyarbakir province has a geothermal potential and usage potential can be increased by using the abandoned oil wells.
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    Morphotectonic development of surface karst in Western Taurus (Türkiye)
    (Springer, 2023) Sener, Mehmet Furkan; Simsek, Mesut; Utlu, Mustafa; Ozturk, Muhammed Zeynel; Sozbilir, Hasan
    The Taurus Mountains, the most important karst terrains of Turkiye, contain many surface and subsurface karst landforms, and the morphometric features of these landforms provide important data on the geomorphological and morphotectonic development of karst areas in the Taurus Mountains. Micro and macro karst depressions are the most important surface landforms in the Western Taurus Mountains. In this study, a total of 7093 micro depressions (doline) and 74 macro depressions (polje) located in the Western Taurus Mountains were detected and morphometric properties were calculated. The poljes developed within the Beydaglari Autochthon and Lycian nappes, while the dolines developed mainly in the high karst plateaus within the Beydaglari Autochthon. As briefly described below, the morphotectonic evolution of both landforms is closely related to the tectonic evolution of the Western Taurus Mountains. As a result of this tectonic activity, the Lycian Nappes from the northwest and the Antalya Nappes from the east thrust over the Beydaglari autochthon, leading to the development of nappes, reverse faults, and fold systems in the study area. The Western Taurus began terrestrialization starting from the Oligocene and began to erode from the Miocene. This erosion process led to the development of valley systems within the Western Taurus region. The NE-SW and NW-SE directional normal faults have developed under the influence of extensional tectonics since the Miocene. This extensional tectonism has caused widespread development of the poljes in the study area. Furthermore, with the lowering of the karst base level, dolines and paleovalleys began to develop in limestone areas at higher elevations. All morphometric and morphotectonic processes reveal that the extension of both doline and polje areas in the study area are parallel to the elongation of tectonic structures in the Western Taurus.
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    Morphotectonic Development ofDolines on Mt. Bozdag (Karaburun Peninsula)
    (Tmmob Jeoloji Muhendisleri Odasi, 2024) Sener, Mehmet Furkan
    This study investigated the morphometric and morphogenetic characteristics of dolines in the Bozda & gbreve; Massif, located in the north of Karaburun Peninsula. Dissolution dolines are one of the characteristic surface features of mid-latitude high karst plateaus, and doline morphometry is one of the methods commonly used to study the morphotectonic evolution characteristics of karst plateaus. In this study, an automatic extraction technique was used with a high-resolution digital elevation model to determine the areal distribution, density and morphometric characteristics of dolines. After the dolines were identified, several morphometric parameters such as area, perimeter, circularity index, length, width and elongation rates were calculated. According to the analyses and results obtained, a total of 564 dolines were detected in the area, with a maximum density of 74 dolines/km 2 . All the dolines, with an average elevation of 1,080 metres, are located on limestone from the Camibo & gbreve;az & imath; Formation. The dolines extend in roughly NW-SE direction, parallel to lineaments in the area, which formed in relation to tectonic processes that started with palaeotectonic evolution and influenced the Karaburun platform in the Izmir-Ankara zone during the Cretaceous period.
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    A review of the geothermal system evolution and distribution in the Central Anatolian Crystalline Complex (Turkiye)
    (Tubitak Scientific & Technological Research Council Turkey, 2023) Sener, Mehmet Furkan; Ozturk, Muhammed Zeynel; Baba, Alper
    Turkiye is located in the Mediterranean sector of the Alpine-Himalayan tectonic belt and is among the foremost seven countries in the world having an abundance of geothermal resources. The Central Anatolian Crystalline Complex (CACC) is one of the most important geothermal regions in Turkiye. This study aims to evaluate the geothermal system of CACC using the geological, structural, and hydrogeochemical properties that were obtained from previous studies. The present study investigated and evaluated the hydrogeochemical and isotopic properties of 762 water samples belonging to 45 different localities from 41 scientific studies. The result shows that CACC has different heat sources and different hydrogeochemical processes. Major element chemistry of the water reveals that the geothermal fluids are mostly of the Ca -Mg -HCO3 , Na -Cl -HCO3 , and Ca-Cl water types. Silica geothermometers suggest that the reservoir temperature ranges from 48 to 180 degrees C. Based on the delta 18O -delta D relationship, water samples have a high-altitude meteoric origin. Stable isotopic data indicate that the geothermal fluids are formed by local recharge and deep circulation of meteoric waters.
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    Structural controls and hydrogeochemical properties of geothermal fields in the Varto region, East Anatolia
    (Tubitak Scientific & Technological Research Council Turkey, 2021) Uzelli, Taygun; Sener, Mehmet Furkan; Dolek, Iskender; Baba, Alper; Sozbilir, Hasan; Dirik, Ramazan Kadir
    Varto and the surrounding region have important geothermal fields, developing in strike-slip tectonic setting in East Anatolia, which resulted from the collision of the Arabian and Eurasian plates. The main structural elements in the area are the NE-trending sinistral and NW-trending dextral strike-slip fault segments and N-S trending extension zones. In order to determine fault-controlled geothermal circulation, it is very important to fully characterize the structural elements in these complex environments. The widely distributed volcanic rocks have fracture and crack systems that play an important role in surface infiltration, geothermal fluid, and groundwater circulation. Especially in areas where the fault segments intersect, hot springs outlets and natural resources easily come to the surface. In order to understand the flow paths of geothermal fluid along the faults in these geothermal systems, it is necessary to determine the stress state of the faults and to map the distribution of the structural elements. For this reason, we conducted a detailed study on the Varto Fault Zone, which has important geothermal fields in Eastern Anatolia. We present conceptual models of the geothermal fields in the Varto region that show favorable geothermal activity on the intersecting fault segments, fault bends, step-overs, and accompanying fracture-crack sets. As a result, we emphasize that the planes of strike-slip faults in transtensional areas are more favorable for secondary permeability and enhances the geothermal fluid circulation, and this can be supported by hydrogeochemical data.