Geofluids / 2019 / Article / Fig 4

Research Article

A Review of the Hydrochemistry of a Deep Sedimentary Aquifer and Its Consequences for Geothermal Operation: Klaipeda, Lithuania

Figure 4

Stable 18O and 2H data for the water sample documented from October 2012 [17] and the water sample of 5/4/17 analysed in Glasgow, compared with available monthly data for isotopic composition of precipitation from the WMO Riga meteorological station (station no. 2642200, 1980-89). The dashed lines show possible interpretations of the local meteoric water line (LMWL) and global meteoric water line (GMWL). Data from [20]. Note that Quaternary intertill aquifers in eastern Lithuania typically contain groundwater with a δ18O of -10.0 to -11.2% (i.e., similar to meteoric water [21]). Lithuanian Devonian aquifers [22] of <500 m depth typically contain groundwater with δ18O of -10.2 to -13.0%; below 500 m depth, the signatures become less negative (as high as -4.5% in borehole Naumiestis 1). See also [23].

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