Figure Legends
Fig. 1 Location of sampling sites within the Zuli River Catchment.
Fig. 2 (a) Annual of total precipitation and mean temperature and (b) monthly variation of total precipitation in the center of the Zuli River catchment (data from Huining weather station) (The blue dashed line refers to annual mean total precipitation in the past 15 years from 2005 to 2019).
Fig. 3 (a) Schematic geological map of the Zuli river catchment and (b) simplified hydrogeological cross-section along with the mainstream of Zuli river (topographical profile A-A’ corresponding to the line in the map (a). The main strata, groundwater flow paths, recharge, and discharge processes in the catchment were also schematically marked in the map.
Fig. 4 Cl/Br vs. Cl (a), Cl/Br vs. Na/Cl (b) relationships of the analyzed water samples. The blue horizontal line marks the Sr/Cl ratio for seawater. The yellow dashed line in Fig. 4b represents the halite dissolution line.
Fig. 5 Relationship between87Sr/86Sr vs Sr2+(a); 87Sr/86Sr Vs Sr/Cl (b); Sr2+ Vs Ca2+ (c) from the analyzed samples.
Fig. 6 Relationship between δ11B Vs B (a); B/Cl Vs TDS (b) from the analyzed samples.
Fig. 7 The boron isotopic composition in the analyzed samples. Data from seawater samples (Barth, 1993) and from non-marine evaporates (Vengosh et al., 1994) are also indicated.
Fig. 8 Relationship between (Ca+Mg) Vs SO4 (a); Ca Vs Mg (b) and Sr/Ca Vs. TDS from the analyzed water samples. The dark dashed line in Fig. 8b represents the dolomite dissolution line.