Water-rock interaction between basalt and high-salinity fluids in the Asal Rift, Republic of Djibouti
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Cited by (27)
Mixed carbonate-siliceous hydrothermal chimneys ahead of the Asal propagating rift (SE Afar Rift, Republic of Djibouti)
2023, Journal of African Earth SciencesCitation Excerpt :Depletion of δ13C values is similar to isotopic composition of reduced organic carbons although hydrothermal carbonates present also depletion of δ13C values (Rye and Sawkins, 1974; Ohmoto and Rye, 1979; Field and Fifarek, 1985). In the Afar Rift system, the δ13C composition of carbonate minerals and hydrothermal chimneys has already been discussed previously (Gasse et al., 1986; Fouillac et al., 1989; Moussa et al., 2019; Dekov et al., 2014, 2021; DeMott et al., 2021), documenting a large range of δ13C values indicative of various sources and mixtures between fluids with distinctive magmatic, meteoric and seawater compositions and evaporation conditions during deposition. Awaleh et al. (2017) also demonstrated the presence of substantial magmatic CO2 inputs in Sakallol-Harallol spring waters.
Lithium-rich geothermal brines in Europe: An up-date about geochemical characteristics and implications for potential Li resources
2022, GeothermicsCitation Excerpt :As mentioned by McDowell and Marshall (1962), Calvet and Prost (1971), Maurel and Volfinger (1977), Chan et al. (1992, 2002), Vigier et al. (2008), Millot et al. (2010), Sanjuan et al. (2014), the Li concentrations in deep reservoirs are likely to be dominated by clay minerals, as Li can be incorporated in their octahedral layers. Octahedral clay minerals, such as montmorillonite, smectite, illite, and chlorite, are some of the essential alteration products of water-rock interactions in geothermal systems (Browne, 1978; Elders and Cohen, 1983; Genter, 1989; Buonasorte et al., 1993; Giggenbach, 1984; Housse, 1984; Fouillac et al., 1989; Ledésert et al., 1996; 1999; Aquilina et al., 1997; Hooijkaas et al., 2006; Haffen, 2012; Vidal et al., 2018; Duringer et al., 2019). Illite or chlorite may also be present in mixed layer clays, and are commonly mentioned as hydrothermal alteration minerals.
Mineralogy, fluid inclusions and stable isotope study of epithermal Au-Ag-Bi-Te mineralization from the SE Afar Rift (Djibouti)
2019, Ore Geology ReviewsCitation Excerpt :Other examples of calcite indicating boiling conditions are documented elsewhere, as in the Waiotapu geothermal area, New Zealand (Hedenquist and Browne, 1989; Simmons and Christenson, 1994). In Djibouti, it has been argued from two deep geothermal boreholes drilled in the Asal rift, that oxygen isotope compositions range from +4.6 to 12.2‰ for whole-rock samples, from +7.3 to +14.3‰ for newly-formed quartz and from +7.8 to 20.4‰ for newly-formed calcite (Fouillac et al., 1989). These authors concluded that δ18Omineral – values tend to decrease with depth, whilst data on the newly-formed quartz allow reliable reconstruction of the thermal log, indicating a zone where fluid circulation occurred at higher temperatures, with probable influx of deep CO2.
Geochemical evolution of geothermal fluids around the western Red Sea and East African Rift geothermal provinces
2018, Journal of Asian Earth SciencesCitation Excerpt :The magneto–telluric survey around the Lake Asal indicate low resistivity zones at shallow levels (<6 km) indicating temperatures of the order of 1200 °C (Mlynarski and Zlotnicki, 2001; Sakindi, 2015). Exploratory drill holes drilled up to 1300 m recorded geothermal gradient of 250 °C/km (Fouillac et al., 1989; Zan et al., 1990; Mlynarski and Zlotnicki, 2001). Self-potential and telluric-telluric surveys conducted around Lake Asal (Mlynarski and Zlotnicki, 2001) indicate seawater as the main fluid circulating within the faults and heated by geothermal flux beneath the rift thus giving rise to the present geothermal system.