Paroxysmal eruptions tracked by variations of helium isotopes: inferences from Piton de la Fournaise (La Reunion island).

ABSTRACT: Helium (He) with its isotopes (³He, ⁴He) is a key tracer enabling the Earth's mantle and dynamics to be characterized. Enrichment in primordial helium (³He) has been detected in volcanic gases of numerous magmatic systems in different geodynamic settings. Despite past use to monitor volcano-tectonic unrest, temporal ³He/⁴He variability in volcanic emissions is still poorly constrained. Here, we investigate noble gas chemistry of Piton de la Fournaise hotspot volcano, where temporal fluctuations of ³He/⁴He in response to the eruptive activity have never been studied. We compare the ³He/⁴He signature of volcanic gases and fluid inclusions and we highlight analogous evolution of the ³

SUBMITTER: Boudoire G 

PROVIDER: S-EPMC7300000 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature