TR Dizin İndeksli Yayınlar / TR Dizin Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7149
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Article Citation - Scopus: 1Anomalous Crustal Structure Beneath the Örenli-Eğiller Depression Zone, Inferred From Magnetotelluric Studies, Western Anatolia, Türkiye(TÜBİTAK - Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, 2024) Chandrasekharam, Dornadula; Raju, K.; Subba Rao, P.B.V.; Baba, AlperIn Türkiye, the prevalence of high radiogenic granites makes them ideal locations for initiating enhanced geothermal system (EGS) projects. One such occurrence of these granites is observed in the Kozak area of the Bergama region. To assess the energy potential of this site, a magnetotelluric (MT) survey was conducted, focusing on determining the depth distribution of the intrusive granite. The survey employed dimensionality analysis, utilizing Bahr skew and phase tensor analyses that denote a 2D subsurface nature up to 100 s and beyond that a 3D nature. In the present study, we interpreted MT data up to 100 s. The data collected, including rotated impedance tensors and tippers, were inverted using a nonlinear conjugate gradient algorithm integrated into the MT interpretation software of the WinG Link 2D inversion data modeling package. Multiple homogeneous half-space initial models were tested during the 2D inversion process. The findings indicate the existence of a midcrustal conductor associated with graphites and iron sulfides in the source region. This conductivity may be attributed to processes such as exsolution of metamorphic fluids, influx of mantle sources, or the entry of magmatic fluids through transcrustal fault zones. The findings indicate that the intrusive granite was emplaced along a NE–SW major fault, penetrating shallow crustal levels. The depth of this granite intrusion is determined to be 15 km, covering an outcrop area of 60 km². This detailed geological information allows a comprehensive assessment of the power-generating capacity of the intrusive granite. The results of this investigation contribute valuable insights for the development and optimization of Enhanced Geothermal System (EGS) projects in the region. © 2024, TUBITAK. All rights reserved.Research Project Tuzla (Çanakkale) jeotermalinin bölgedeki akifere toprağa ve suya etkilerinin araştırılması(TÜBİTAK - Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, 2005) Baba, Alper; Özcan, Hasan; Yılmaz, Selahattin; Kavdır, Yasemin; Deniz, Ozan; Yiğini, Yusuf; Yılmaz, Sevinç; Baba, BarışTürkiye'nin sıcaklık bakımından üçüncü önemli sahası durumunda olan Tuzla jeotermal sahasındaki akışkanın yöredeki toprağa ve suya olan etkileri irdelenmiştir. Soğuk ve sıcak su kaynaklarının özelliklerini ve birbirleri ile olan ilişkilerini belirlemek amacıyla Ağustos 2003, alık 2003, Mart 2004 ve Haziran 2004 tarihlerinde su numuneleri alınmıştır. Bu su -numunelerinden major anyon, katyon, ağır metal ve çevresel izotop (18O, 2H, 3H) analizleri yapılmıştır. Ayrıca 0-30; 30-60; 60-90; 90-120 cm derinliklerinde ise toprak numunelerinde ise bazı fizikokimyasal özellikler, ağır metal ve radyoaktivite çalışmaları gerçekleştirilmiştir. Sıcak sular, denizel kökenli evaporıtik yataklardan çözünerek gelen sular olup, tatlı sular ile karışım göstermektedir. Sahadaki tüm sular meteorik kökenli olup, tatlı yeraltı suları ile connate (hapis) tuzlu suyun karışımından ibarettir. Sahasının güneydoğusundan gelen EC'si düşük (600-800 micromho/cm) yeraltı sularının jeotermal sular etkisi ile EC'sinin (1400-3200 micromho/cm) yükseldiği görülmektedir. Nitekim CaHCCVlü sular fasiyesinde yer alan yeraltı suları sıcaksularm etkisi ise CaCVlı sulara geçiş göstermektedir. Proje sahasındaki jeotermal suların Tuzla tatlı yeraltı suyu akiferine olan olumsuz etkileri iki şekilde olmaktadır: a) Jeotermal suların yeraltı sularına mevsimlik etkisi, ki buna dolaylı etki denebilir: kurak dönemde yüzeyde biriken tuz ve ağır metal bileşimlerinin, kışın yağışlar vasıtası ile yeraltına süzülmesi, b) Sahada çıkan yüksek basınca sahip jeotermal suların yukarıya doğru dikey çatlak, kırık veya faylar vasıtası ile yükselimi, yani genel anlamda yeraltı suyuna etkisi. Jeotermal suların yukarıda belirtilen her iki etkisinden ötürü yeraltı suyunun duraylı izotop değerleri beklenilenden daha pozitif değerlerdedir. Genel olarak, inceleme alanındaki sıcak suların da yukarıya doğru çıkarken soğuk yeraltı suyu akiferine karışımından ötürü 518O ve 6D değerlerinde bir azalma da söz konusu olmuştur.Article Citation - WoS: 13Citation - Scopus: 15High Heat Generating Granites of Kestanbol: Future Enhanced Geothermal System (egs) Province in Western Anatolia(TÜBİTAK - Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, 2021) Chandrasekharam, Dornadula; Baba, AlperAlthough the western Anatolian region is a foci for hydrothermal systems, this region has several high heat-generating granitic intrusive bodies that qualify to be candidates for enhanced geothermal systems (EGS). Considering the future energy requirement, carbon dioxide emissions reduction strategies, food, and water security issues, these granites appear to be the future clean energy source for the country. One such granite intrusive is located in the Kestanbol area in the western Anatolian region. The radioactive heat generation of this 28 Ma old granite varies from 5.25 to 10.38 µW/m3 with a heat flow of 92.47 to 128.61 mW/m2 . These values concur with the measured geothermal gradients and heat flow values measured from exploratory bore wells. High radon content in the thermal waters in these areas indicates interaction between the circulating fluids and the Kestanbol granite. This is for the first time evaluation of the EGS potential of granite intrusive in Turkey has been made. The Kestanbol intrusive is placed under a compressive stress regime within the Anatolian-Aegean regional tectonic framework.Article Citation - WoS: 4Citation - Scopus: 15Effects of Seismic Activity on Groundwater Level and Geothermal Systems in İzmir, Western Anatolia, Turkey: the Case Study From October 30, 2020 Samos Earthquake(TÜBİTAK - Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, 2021) Uzelli, Taygun; Bilgiç, Esra; Öztürk, Bahadır; Baba, Alper; Sözbilir, Hasan; Tatar, OrhanThe October 30, 2020 Samos earthquake (Mw 6.6) affected the Aegean Sea and environs, caused destruction and loss of life in the city of İzmir located 70 km away from the earthquake epicenter. Before this earthquake, water resources were monitored in the areas of Bayraklı, Gülbahçe, and Seferihisar. For this purpose, 10 groundwater monitoring wells were drilled in the Bayraklı area, where groundwater level, temperature, and electrical conductivity changes were monitored at 1-h intervals in 5 wells. Besides physical parameters such as groundwater levels, temperatures and electrical conductivities, hydrogeochemical cations, and anions measured in the study area. Change in the groundwater levels was observed before, during, and after the Samos earthquake. A trend of rising groundwater level was observed two days before the mainshock, to a height of 10 cm, and the level was maintained till the end of the earthquake. The water levels returned to its original height after about 7 to 10 days of the earthquake. Moreover, electrical conductivity (EC) values were changed because of the interaction with the surrounding rocks and well walls, mixing with different waters during the earthquake shaking. The essential anomalies were observed in the geothermal fields of Gülbahçe and Seferihisar. Due to this earthquake, new geothermal springs emerged along the NE-SW trending Gülbahçe and Tuzla faults, located about 50 to 20 km from the Samos earthquake epicenter, respectively. The new geothermal waters are in Na-Cl composition and similar to other geothermal springs in the region. While the recorded water temperatures in the new geothermal springs vary from 40 to 45 °C in Seferihisar, it was measured between 35 and 40 °C in Gülbahçe. Due to these anomalies, it is found essential to monitor the effect of the earthquake on the physical and chemical characteristics of the groundwater and its usefulness in earthquake predictions.