@article{fdi:010079931,
  title = {{F}irst in-situ measurements of plume chemistry at {M}ount {G}aret {V}olcano, {I}sland of {G}aua ({V}anuatu)},
  author = {{L}ages, {J}. and {M}oussallam, {Y}ves and {B}ani, {P}hilipson and {P}eters, {N}. and {A}iuppa, {A}. and {B}itetto, {M}. and {G}iudice, {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{R}ecent volcanic gas compilations have urged the need to expand in-situ plume measurements to poorly studied, remote volcanic regions. {D}espite being recognized as one of the main volcanic epicenters on the planet, the {V}anuatu arc remains poorly characterized for its subaerial emissions and their chemical imprints. {H}ere, we report on the first plume chemistry data for {M}ount {G}aret, on the island of {G}aua, one of the few persistent volatile emitters along the {V}anuatu arc. {D}ata were collected with a multi-component gas analyzer system (multi-{GAS}) during a field campaign in {D}ecember 2018. {T}he average volcanic gas chemistry is characterized by mean molar {CO}2/{SO}2, {H}2{O}/{SO}2, {H}2{S}/{SO}2 and {H}-2/{SO}2 ratios of 0.87, 47.2, 0.13 and 0.01, respectively. {M}olar proportions in the gas plume are estimated at 95.9 +/- 11.6, 1.8 +/- 0.5, 2.0 +/- 0.01, 0.26 +/- 0.02 and 0.06 +/- 0.01, for {H}2{O}, {CO}2, {SO}2, {H}2{S} and {H}-2. {U}sing the satellite-based 10-year (2005-2015) averaged {SO}2 flux of similar to 434 t d(-1) for {M}t. {G}aret, we estimate a total volatile output of about 6482 t d(-1) ({CO}2 similar to 259 t d(-1); {H}2{O} similar to 5758 t d(-1); {H}2{S} similar to 30 t d(-1); {H}-2 similar to 0.5 t d(-1)). {T}his may be representative of a quiescent, yet persistent degassing period at {M}t. {G}aret; whilst, as indicated by {SO}2 flux reports for the 2009-2010 unrest, emissions can be much higher during eruptive episodes. {O}ur estimated emission rates and gas composition for {M}ount {G}aret provide insightful information on volcanic gas signatures in the northernmost part of the {V}anuatu {A}rc {S}egment. {T}he apparent {CO}2-poor signature of high-temperature plume degassing at {M}ount {G}aret raises questions on the nature of sediments being subducted in this region of the arc and the possible role of the slab as the source of subaerial {CO}2. {I}n order to better address the dynamics of along-arc volatile recycling, more volcanic gas surveys are needed focusing on northern {V}anuatu volcanoes.},
  keywords = {{V}anuatu ; {G}aua ; {M}ount {G}aret ; {M}ulti-{GAS} ; volcanic gas compositions ; volatile fluxes ; {VANUATU} ; {GARET} {VOLCAN} ; {GAUA} {ILE}},
  booktitle = {},
  journal = {{A}pplied {S}ciences},
  volume = {10},
  numero = {20},
  pages = {7293 [15]},
  year = {2020},
  DOI = {10.3390/app10207293},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079931},
}