Search results for " volcanic fluids"

showing 2 items of 2 documents

Understanding volcanoes in the Vanuatu arc

2016

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 He-3/He-4 ratios in thermal fluids of Epi (4.0 +/- 0.1 R-a), Efate (4.5 +/- 0.1 R-a) and Pentecost (5.3 +/- 0.5 R-a) islands coherently indicate reduced mantle gas leakage and crustal contamination by radiogenic helium on these extinct volcanic systems of the former (Pliocene) arc. Instead, presently active Vanuatu volcanoes display He-3/He-4 and C/He-3 ratios typical of subduction-related volcanic arcs: He-3/He-4 ratios range from 6.4 +/- 0.5 Ra in southernmost Tanna and 7.23 +/- 0.09 …

010504 meteorology & atmospheric sciencesLavaEarth scienceGeochemistryVanuatu arcHelium isotopes[SDU.STU]Sciences of the Universe [physics]/Earth Sciences010502 geochemistry & geophysics01 natural sciencesVolcanic fluidsVolcanic GasesGeochemistry and Petrologyevent0105 earth and related environmental sciencesBasaltevent.disaster_typegeographygeography.geographical_feature_categoryVolcanic arcHotspot contributionFumaroleExtinct and active volcanoesMantle sourceSettore GEO/08 - Geochimica E VulcanologiaGeophysicsVolcano13. Climate actionVanuatu arc Volcanic fluids Helium isotopes Extinct and active volcanoes Mantle source Hotspot contributionIsland arcPhenocrystGeology
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Origin and evolution of the fluids emitted along the “Sperchios Basin – Evoikos Gulf” Graben (Central Greece)

2013

Greece volcanic fluidsSettore GEO/08 - Geochimica E Vulcanologia
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