## 3 Results
### Isotope Composition of Noble Gases in Fluid Inclusions  
12. aliquots of Oi and Px crystals were separated from the 6 Telica and Baru samples, and selected for He, Ne and Ar isotope measurements in FI (Table 1). For the Telica volcano, the \({}^{4}\)He concentrations [He] measured in samples TEL02, TEL04K and TEL04B varied significantly (Figure 2). In Oi they ranged from 4.69\(\cdot\)10\({}^{-14}\) mol/g to 1.10\(\cdot\)10\({}^{-13}\) mol/g. In Px, [He] they ranged from 7.43\(\cdot\)10\({}^{-14}\) mol/g to 1.70\(\cdot\)10\({}^{-13}\) mol/g. The lowest \({}^{4}\)He contents were observed in sample TEL04B (OI), while the Px of TEL04K was typically the most [He] rich (Table 1). Ne and Ar in Oi had ranges of 4.03\(\cdot\)10\({}^{-15}\) mol/g-1.86\(\cdot\)10\({}^{-14}\) mol/g and 3.93\(\cdot\)10\({}^{-13}\) mol/g-2.47\(\cdot\)10\({}^{-12}\) mol/g, respectively. Ne and Ar were found at levels of 6.56\(\cdot\)10\({}^{-15}\)-2.90\(\cdot\)10\({}^{-14}\) mol/g and 5.73\(\cdot\)10\({}^{-13}\)-1.92\(\cdot\)10\({}^{-12}\) mol/g respectively in Px (Table 1). The \({}^{40}\)Ar/\({}^{36}\)Ar values were from 297.0 to 318.0 in all samples, slightly higher than typical atmospheric signatures (\({}^{40}\)Ar/\({}^{36}\)Ar = 295.5; [84]). \({}^{46}\)He/\({}^{20}\)Ne ratios varied in the 3.2-27.4 range (Figure 3), with the highest values measured in samples TEL04K, TEL04B (the atmospheric \({}^{4}\)He/\({}^{20}\)Ne is 0.318; [84]. In samples from Telica, \({}^{40}\)Ar* was in the range 1.08-9.75-10\({}^{-14}\) mol/g (Table 1). For the Baru volcano, [He] concentrations measured in FI from Ol and Px of LCI, LCS and Bambito samples were generally 10 times less than in Telica crystals (Figure 2). In Ol, [He] ranged from 3.18\(\cdot\)10\({}^{-14}\) mol/g to 4.21\(\cdot\)10\({}^{-14}\) mol/g, while Px varied from 3.70\(\cdot\)10\({}^{-15}\) mol/g to 8.71\(\cdot\)10\({}^{-15}\) mol/g (Figure 2). The lowest He content was observed in Px from LCI, while Ol were typically the most [He] rich. Ne and Ar in Ol had ranges of 1.73\(\cdot\)10\({}^{-16}\) mol/g-4.42\(\cdot\)10\({}^{-15}\) mol/g and 8.74\(\cdot\)10\({}^{-13}\) mol/g-2.37\(\cdot\)10\({}^{-12}\) mol/g, respectively (Table 1). Neon and Argon were found at levels of 2.66\(\cdot\)10\({}^{-15}\)-6.82\(\cdot\)10\({}^{-15}\) mol/g and 5.04\(\cdot\)10\({}^{-13}\)-1.16\(\cdot\)10\({}^{-12}\) mol/g, respectively in Px. \({}^{40}\)Ar/\({}^{36}\)Ar values were from 324.8 to 460.2. The \({}^{4}\)He/\({}^{20}\)Ne varied in the range 1.0-184.0 with the highest value measured in Ol from LCI (Figure 3). In samples from Baru, \({}^{40}\)Ar* varied between 8.15\(\cdot\)10\({}^{-14}\) and 2.14\(\cdot\)10\({}^{-13}\) (Table 1). The \({}^{3}\)He/\({}^{4}\)He corrected for atmospheric contamination (Rc/Ra) in Ol samples from Telica varied from 7.25 Ra to 7.43 Ra, while in Px from 6.06 Ra to 7.33 Ra (Figures 2 and 3; Table 1). In the Baru volcano, Ol samples varied from 7.14 Ra to 7.94 Ra, while Px from 4.19 Ra to 5.77 Ra. Due to the strong atmospheric contamination shown by the \({}^{4}\)He/\({}^{20}\)Ne and \({}^{40}\)Ar/\({}^{36}\)Ar values, the bias between Rc/Ra and R/Ra values was between 0.08 and 0.79 Ra, except for cpx of samples LCI and LCS where it reached 1.24 and 1.58 Ra, respectively (Table 1). At Telica, \({}^{4}\)He/\({}^{40}\)Ar* ratios varied between 0.76 (in cpx from TEL 02) and 5.23 (in Ol from TEL04K), while at Baru they were between 0.03 (in cpx from BAM and LCS) and 0.24 (in Ol from LCI). The \({}^{4}\)He/\({}^{40}\)Ar* from Telica were within the typical mantle production ratio (1-5, [85] and the range of magmatic gases (e.g., [38; 49; 51; 52]. In contrast, those from Baru reflected an early stage of degassing (\({}^{4}\)He/\({}^{40}\)Ar* = 0.2) and a partial loss of helium (\({}^{4}\)He/\({}^{40}\)Ar* = 0.03-0.11) as testified by the contemporary low Rc/Ra values (Table 1).