Post-earthquake anomalies in He–CO2 isotope and relative abundance systematics of thermal waters: The case of the 2011 Van earthquake, eastern Anatolia, Turkey

Turkish geothermal fields as natural analogues of CO 2 storage sites: Gas geochemistry and implications for CO 2 trapping mechanisms

“…Mantle-He is found to range up to 96% of the total He in the vicinity of the historically-active Nemrut volcano, high CO 2 / 3 He ratios are attributed to the effects of hydrothermal degassing, and the C-inventory is found to be dominated by limestone-C (>80%) (Mutlu et al, 2012). The study relevant to the post-earthquake period (Aydın et al, 2015) showed the sensitivity of He-isotopes to seismic perturbations in the crust. In both studies (Mutlu et al, 2012;Aydın et al, 2015), sampling was regional in scale but He-CO 2 data are restricted to a single sample from each specific location.…”

“…The study relevant to the post-earthquake period (Aydın et al, 2015) showed the sensitivity of He-isotopes to seismic perturbations in the crust. In both studies (Mutlu et al, 2012;Aydın et al, 2015), sampling was regional in scale but He-CO 2 data are restricted to a single sample from each specific location. Hence these data are not included in the present study.…”

“…We recently studied the He-CO 2 systematics of the eastern Anatolian province to examine the distribution of mantle-derived He and CO 2 in relation to mantle-crust dynamics (Mutlu et al, 2012), and to compare data before and after the devastating October 23, 2011 Van earthquake (M: 7.2) (Aydın et al, 2015). These studies revealed ranges of 0.84-7.76 R A for He-isotope compositions, 2.4 × 10 5 to 6.8 × 10 13 for CO 2 / 3 He ratios, −9.37 to +1.39‰ for ı 13 C values for the region.…”

“…1). The database utilized in this study is produced essentially from the results of our studies in different regions of Turkey since 2000 (Güleç et al, 2002;Mutlu et al, 2008Mutlu et al, , 2012de Leeuw et al, 2010;Aydın et al, 2015), as well as from studies by other researchers (Wiersberg et al, 2011;Italiano et al, 2013;Karakuş and Ş imş ek, 2013). In the EAFZ and western Anatolia, there is widespread coverage of the He and CO 2 systematics of geothermal systems (Mutlu et al, , 2012Wiersberg et al, 2011;Italiano et al, 2013;Karakuş and Ş imş ek, 2013), whilst in the NAFZ there is the added advantage of temporal monitoring at individual localities (de Leeuw et al, 2010).…”

Geochemistry of Fluid Inclusions in Travertines From Western and Northern Turkey: Inferences on the Role of Active Faults in Fluids Circulation

“…The tectonic setting of Turkey resulted in a prolonged seismic activity as testified by the occurrence of several catastrophic earthquakes lasting up to the present time (e.g., Barka, 1996Barka, , 1999Koçyiğit et al, 1999;Güleç et al, 2002;Aydın et al, 2015). This high seismicity is related to the complex geodynamics governed by the collision between the Eurasian Plate and both the African and Arabian Plates (Şengör & Yılmaz, 1981).…”