Proceedings World Geothermal Congress 2005 Antalya, Turkey, 24-29 April 2005 Isotope Composition of Geothermal Fluids along the North Anatolian Fault Zone: Spatial and Temporal Variations in Relation to Seismic Activities Nilgün Güleç1, David Raymond Hilton2, G.A.M. de Leeuw2, Halim Mutlu3, Selin Süer1, Candan Çifter4 1Middle East Technical University, Department of Geological Engineering, TR-06531, Ankara, Turkey
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[email protected] 2Fluids & Volatiles Lab., Geosciences Research Division, Scripps Inst. of Oceanography, UCSD, La Jolla, CA 92093-0244, USA
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[email protected] 3Osmangazi University, Department of Geological Engineering, TR-26480, Eskişehir, Turkey
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[email protected] Keywords: Geothermal Fluids, Isotopic Composition, 3.7.2002 and 13.7.2002 (epicentre: Armutlu-Yalova, M: Monitoring, Seismicity, North Anatolian Fault Zone 3.1). Similarly, although δ13C values in Yalova are < 0 ‰ in almost all sampling periods, an anomalous value (+ 5.79 ABSTRACT ‰) is recorded in March 2002, on the same day (23.3.2002) This study presents results of an on-going monitoring as an earthquake (M: 4.7) occurred in the Sea of Marmara. δ13 programme aimed at characterizing compositional Yet another point to note is the 0.5 – 2 ‰ drop in C variations in geothermal fluids along the North Anatolian values at most sampling sites in October 2002 which is one Fault Zone (NAFZ). The study was initiated through a of the most seismically active months of the monitoring preliminary He-isotope survey in 2000 in response to 2 programme.