@article{fdi:010097359,
  title = {{T}he {M}orococala {V}olcanic {F}ield, {B}olivia : geochemistry and geochronology in the {H}uanuni district},
  author = {{J}aramillo-{R}ios, {J}. {S}. and {E}spinoza-{O}tayza, {J}. {A}. and {R}amirez-{B}riones, {J}. and {V}alverde-{R}odriguez, {P}. {E}. and {V}allance, {J}. and {T}avazzani, {L}. and {C}helle-{M}ichou, {C}. and de {H}aller, {A}. and {C}hiaradia, {M}. and {S}pikings, {R}. {A}. and {Z}anetti, {K}. {A}. and {K}onrad, {K}. and {B}aby, {P}atrice and {M}elgarejo, {J}. {C}. and {T}orró, {L}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {C}entral {A}ndes constitute a key natural laboratory for studying the tectono-magmatic response to subduction beneath thick continental crust and the formation of associated ore deposits. {I}n the {B}olivian back-arc region, world-class {S}n-polymetallic deposits of the {H}uanuni district are spatially associated with rhyolitic dikes and voluminous peraluminous pyroclastic deposits related to the {M}orococala {V}olcanic {F}ield. {N}ew geochronological data indicate that the peraluminous rhyolitic dikes in {H}uanuni were coeval and likely part of the same magmatic plumbing system at ca. 7.0-6.4 {M}a, and hence are not associated with the {O}ligocene-{M}iocene {S}n-polymetallic mineralization (ca. 24 {M}a). {M}ixing models based on {N}d-{S}r isotopic compositions of the {M}orococala {V}olcanic {F}ield, supported by {M}onte {C}arlo simulations, suggest crustal contributions of similar to 45-70%. {T}hese are, in general, concordant with the similar to 50:50 mantle-derived melts and continental crust mass balance models proposed for other ignimbrite fields of the {N}eogene {I}gnimbrite {P}rovince of the {C}entral {A}ndes in the back-arc region (e.g., {L}os {F}railes {V}olcanic {F}ield and the {P}anizos, {C}oranzuli, {V}ilama, and {R}amadas fields within the {A}ltiplano-{P}una {V}olcanic {C}omplex). {M}ineralogical and geochemical evidence suggests that the associated magmas formed under thick-crustal conditions, with garnet as a residual phase. {T}he voluminous rhyolitic magmatism in the {M}orococala {V}olcanic {F}ield likely resulted from hot mantle upwelling induced by slab re-steepening of the subducted slab after a flat-slab episode.},
  keywords = {{I}gnimbrite ; {P}eraluminous magmatism ; {N}eogene ignimbrite province of the ; {C}entral {A}ndes ; {C}entral {A}ndean tin belt ; {G}eochronology ; {BOLIVIE} ; {ANDES} ; {MOROCOCALA} {VOLCAN}},
  booktitle = {},
  journal = {{J}ournal of {S}outh {A}merican {E}arth {S}ciences},
  volume = {179},
  numero = {},
  pages = {106112 [25 p.]},
  ISSN = {0895-9811},
  year = {2026},
  DOI = {10.1016/j.jsames.2026.106112},
  URL = {https://www.documentation.ird.fr/hor/fdi:010097359},
}