Fig. 2 (a, b) Thermal stratification of LGM and Lago Piccolo di Monticchio (LPM) in summer 1994. (c–i) Selected water profiles of LGM for two sampling dates in 1994. Data for surface and deep water composition of LPM are given inside the diagrams for comparison; unique symbols for individual sampling dates are used throughout; data for deep water composition in LPM after Cioni et al. (2006) and references therein. Lowered Ca and Ca/Sr values in the surface water of LGM reflect the deposition of low-Sr autochthonous calcite. DIC was considered as HCO3 for the calculation of anion sums, distinct anion excess, particularly for 22 August, reflects high CO2 concentrations in the deep water of LGM. High Sr contents are typical for local springs
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