Figure 3
From: In situ observation of helium and argon release during fluid-pressure-triggered rock deformation
(a) Ar/N2 as a function of He/N2. The mixing line (short dashed line) from atmospheric (black reversed triangle) to (He, Ar)-enriched fluid end-members (olive star) was collected in 1982 during the realization of exploration boreholes and reported in Frick et al.30,31. The confidence area for binary mixing is drawn as a gray triangle accounting for the variability in the Ar and N2 concentrations measured in the samples collected in 1982. The background average ratio and standard deviations are shown as blue squares and error bars. (b) is a zoom of the concentration range of interest (corresponding to the dashed rectangle in panel a) with peak concentrations presented with different symbols and colors for the different HF# experiments (refer to Fig. 2d for the locations of peak concentrations identified in the time series of He/N2). Concentrations measured after the stimulation experiment are shown as a wine-colored circle. Error bars are 2σ.
