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We report the first helium isotope survey of volcanic gases, hot springs and some olivine phenocrysts along the Vanuatu island arc, from Tanna in the south to Vanua Lava in the north. Low CO2 content and low 3He/4He ratios in thermal fluids of Epi (4.0±0.1Ra), Efate (4.5±0.1Ra) and Pentecost (5.3±0.5Ra) islands coherently indicate reduced mantle gas leakage and crustal contamination by radiogenic...
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