Akademik Veri Yönetim Sistemi
CHEMICAL GEOLOGY, cilt.334, ss.364-377, 2012 (SCI-Expanded)
Turkey is an area of complex geology with active tectonics and high geothermal potential. Especially, the western part of Turkey is a region of abundant geothermal activity. Faults accommodating the deep circulation of hydrothermal fluids of meteoric origin are the primary means by which of geothermal systems are controlled in this region. Many of the thermal activities are related to the improved dilation on the similar to E-W-strikes of the graben faults. This situation serves as a suitable environment for the presence of high levels of arsenic in geothermal water resources. The highest concentrations of naturally occurring aqueous arsenic (As) are found in certain types of geothermal waters, generally those related to major graben faults. In this regard, high arsenic concentrations in geothermal resources have been detected in Western Turkey, including but not limited to Biga Peninsulla, Gediz Graben, Kucuk, and Buyuk Menderes Graben with values ranging from 1 to 1419 ppb in geothermal fluids. The thermal waters have surface temperatures of up to 100 degrees C and reservoir temperatures range from 150 to 248 degrees C in the Menderes Graben, from 120 to 287 degrees C in the Gediz Graben, and from 153 to 174 degrees C in Biga Peninsula. Hydrogeochemically, the Menderes graben and Gediz Graben thermal waters are of the Na-HCO3, Ca-HCO3, and Na-SO4 types, whereas some geothermal fluids such as those of Tuzla and Kestanbol in the Biga Peninsula, Cesme, and Urla are of the Na-Cl type. (C) 2012 Elsevier B.V. All rights reserved.