@article{fdi:010084542,
  title = {{H}igh {CO}2 content in magmas of the explosive andesitic {E}nco eruption of {M}ocho-{C}hoshuenco volcano ({C}hile)},
  author = {{F}eignon, {J}. {G}. and {C}luzel, {N}. and {S}chiavi, {F}ederica and {M}oune, {S}. and {R}oche, {O}livier and {C}lavero, {J}. and {S}chiano, {P}. and {A}uxerre, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{M}ocho-{C}hoshuenco volcano has produced several highly explosive eruptions during its history, which make it one of the most hazardous volcanoes in the southern volcanic zone of {C}hile, although it is still relatively little studied to date. {W}e present a geochemical study of the products of the sub-{P}linian, andesitic, {E}nco eruption that occurred about 1600 years ago. {W}e determined the major and trace elements compositions, as well as the volatile ({H}2{O}, {CO}2, {C}l, and {S}) contents of melt inclusions trapped in minerals (olivine, plagioclase, and pyroxene) using electron microprobe, ion microprobe ({SIMS}), and 3{D} confocal {R}aman mapping. {T}hough the whole-rock composition of the {E}nco magma is andesitic (60.2 +/- 1.1 wt.% {S}i{O}2), the melt inclusions have {S}i{O}2 contents ranging from 50.3 to 67.3 wt.%, following the magmatic series of {M}ocho-{C}hoshuenco, and the compositions of the most mafic melt inclusions are close to those of the most mafic erupted magmas. {G}eochemical modeling indicates that mixing occurred between a mafic magma and an andesitic-to-dacitic magma. {G}lass analysis revealed typical parental arc magma values for {H} {O}-2 (2.6-3.8 wt.%), {S} (116-1936 ppm), and {C}l (620-1439 ppm). {H}owever, {CO}2 contents are very high in some melt inclusions with concentrations above 4000 ppm (measured in the glass), suggesting trapping depths > similar to 17-22 km. {P}resence of solid carbonates inside inclusion-hosted bubbles clearly indicates that the {CO}2 contents measured in the glass phase were minimum values. {W}e conclude that a {CO}2-rich basaltic magma ascended and mixed with a shallower andesitic magma. {T}he magma cooled and exsolved high amounts of {CO}2, which may have dramatically increased the pressure and triggered the highly explosive {E}nco eruption.},
  keywords = {{C}arbon dioxide ; {M}ocho-{C}hoshuenco ; {M}agma volatile content ; {E}xplosive eruption ; 3{D} {R}aman mapping ; {M}elt inclusions ; {CHILI} ; {MOCHO} {CHOSHUENCO} {VOLCAN}},
  booktitle = {},
  journal = {{B}ulletin of {V}olcanology},
  volume = {84},
  numero = {4},
  pages = {40 [20 ]},
  ISSN = {0258-8900},
  year = {2022},
  DOI = {10.1007/s00445-022-01550-y},
  URL = {https://www.documentation.ird.fr/hor/fdi:010084542},
}