@article{fdi:010069261,
  title = {{A}ntisana volcano : a representative andesitic volcano of the eastern cordillera of {E}cuador : petrography, chemistry, tephra and glacial stratigraphy},
  author = {{H}all, {M}. {L}. and {M}othes, {P}. {A}. and {S}amaniego, {P}ablo and {M}ilitzer, {A}. and {B}eate, {B}. and {R}amon, {P}. and {R}obin, {C}laude},
  editor = {},
  language = {{ENG}},
  abstract = {{A}ntisana volcano is representative of many active andesitic strato-volcanoes of {P}leistocene age in {E}cuador's {E}astern {C}ordillera. {T}his study represents the first modern geological and volcanological investigation of {A}ntisana since the late 1890's; it also summarizes the present geochemical understanding of its genesis. {T}he volcano's development includes the formation and destruction of two older edifices ({A}ntisana {I} and {II}) during some 400 + ka. {A}ntisana {II} suffered a sector collapse about 15,000 years ago which was followed by the birth and growth of {A}ntisana {III}. {D}uring its short life {A}ntisana {III} has generated >= 50 eruptions of small to medium intensity, often associated with andesitic to dacitic lava flows and tephra, as well as with late {P}leistocene and {H}olocene glacial advances. {T}hroughout its long history {A}ntisana's lavas have been characterized by a persistent mineral assemblage, consisting of 30 40 vol% phenocrysts of plagioclase, both clino- and orthopyroxene, and {F}e-{T}i oxides, with rare occurrences of olivine or amphibole, frequently in a microcrystalline to glassy matrix. {T}his uniformity occurs despite the magma's progressive chemical evolution over >= 400 ka from early basic andesites (53-58 wt % {S}i{O}2) to intermediate and {S}i-rich andesites (58-62% {S}i{O}2), and recently to dacites (63-67% {S}i{O}2). {C}hemical diagrams suggest that crystal fractionation was the most likely magmatic process of evolution. {T}he exception to this slowly evolving history was the short-lived emission at 210 ka of the {C}uyuja lavas from {A}ntisana {II} that generated a 73 km long andesitic lava flow. {C}ontrasting with {A}ntisana's general magmatic trend, {C}uyuja lava (similar to 11 km(3)) is a high-{M}g andesite with unusually high concentrations of incompatible elements. {A}ntisana developed within the {C}hacana caldera complex, a large active siliceous center that began similar to 3 {M}a ago, however its lavas are chemically distinct from coeval lavas of {C}hacana.},
  keywords = {{L}ong-lived evolving andesitic volcanism ; {A}ntisana ; {N}orthern {V}olcanic {Z}one ; {EQUATEUR} ; {ANTISANA} {VOLCAN}},
  booktitle = {},
  journal = {{J}ournal of {S}outh {A}merican {E}arth {S}ciences},
  volume = {73},
  numero = {},
  pages = {50--64},
  ISSN = {0895-9811},
  year = {2017},
  DOI = {10.1016/j.jsames.2016.11.005},
  URL = {https://www.documentation.ird.fr/hor/fdi:010069261},
}