Figure 2.

Geochemical characteristics of fluids collected from mud pools and sediments from (A) Aragona (AR), (B) Comitini (COM), (C) Paterno (PA01), and (D) Vallone (PA02). Cross symbols marked at 0 cm depth represent the concentrations or isotopic compositions of fluids from mud pools. Open circles represent the concentrations below the detection limit. Panels filled with gray color and marked with N.A. indicate that the data is not available because the volume or concentration was too low for analyses. Data for the concentration of chloride, sulfate, methane and δ¹³C-methane were adopted from Tu et al. (2022).