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Chemical variability in volcanic gas plumes and fumaroles along the East African Rift System: New insights from the Western Branch
2022, Chemical GeologyCitation Excerpt :Previous data obtained in volcanic gas plumes and fumaroles at persistently active volcanoes along the EARS are compiled from Gerlach (1982), Oppenheimer et al. (2002), Pik et al. (2006), Sawyer et al. (2008a, 2008b), Fischer et al. (2009), Tedesco et al. (2010), Bobrowski et al. (2017a,b), Boucher et al. (2018) and Mollex et al. (2018). The composition of the end-members used to define the mixing curves are defined from the following literature: DMM (Sheppard and Epstein, 1970; Gautheron and Moreira, 2002; Zelenski and Taran, 2011; Clog et al., 2013; Barry et al., 2013; Hallis et al., 2015; Rizzo et al., 2018), African Superplume (Pik et al., 2006; Darrah et al., 2013), SCLM (Gautheron and Moreira, 2002; Rizzo et al., 2018), Continental Crust (Zelenski and Taran, 2011; Taran and Zelenski, 2015), Oceanic Crust (Zelenski and Taran, 2011; Barry et al., 2013; Taran and Zelenski, 2015), Limestone (Barry et al., 2013), Sediments (Zelenski and Taran, 2011; Barry et al., 2013), Mantle carbonates (Harmer, 1999; Casola et al., 2020; Carnevale et al., 2021), Air and ASW (Zelenski and Taran, 2011). MultiGAS measurements in volcanic gas plumes performed in February 2020 reveal an average CO2/SO2 ratio of 22 ± 8.4 and 15.5 ± 5.7 and an average H2O/CO2 ratio of 1.9 ± 0.2 and 12.4 ± 6.3 at Nyiragongo and Nyamulagira, respectively (Fig. 2a).
Sources and transport of fluid and heat at the newly-developed Theistareykir Geothermal Field, Iceland
2020, Journal of Volcanology and Geothermal ResearchCitation Excerpt :Magmatic water is considered to be water in its aqueous or gaseous phase in equilibrium with the magma and originating from the expulsed fluids of the crystalized magma (Sheppard et al., 1969). Magmatic water composition depends on the parent magma, but generally exhibits high salinities and δ2H and δ18O values ranging from −80‰ to −10‰ and +6‰ to +10‰ respectively (Sheppard and Epstein, 1970). Here below, the different fluid sources are discriminated and fluid ages proposed using stable isotopes of water and noble gases.
Phase segregation, boiling, and reinjection at the Los Azufres Geothermal Field, Mexico, monitored by water stable isotopes, chloride, and enthalpy
2020, Journal of Volcanology and Geothermal ResearchSignature of ongoing brine reinjection on noble gas isotopes and fluid chemistry at Las Tres Vírgenes geothermal field, Mexico
2019, Journal of Volcanology and Geothermal Research
Publications of the Division of Geological Sciences, California Institute of Technology, Pasadena, California, Contribution No. 1725.
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Now at Scottish Research Reactor Centre, East Kilbride, Scotland.