@article{fdi:010068355,
  title = {{T}he eruptive chronology of the {A}mpato-{S}abancaya volcanic complex ({S}outhern {P}eru)},
  author = {{S}amaniego, {P}ablo and {R}ivera, {M}. and {M}arino, {J}. and {G}uillou, {H}. and {L}iorzou, {C}. and {Z}erathe, {S}wann and {D}elgado, {R}. and {V}alderrama, {P}. and {S}cao, {V}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e have reconstructed the eruptive chronology of the {A}mpato-{S}abancaya volcanic complex ({S}outhern {P}eru) on the basis of extensive fieldwork, and a large dataset of geochronological ({K}-40-{A}r-40, {C}-14 and {H}e-3) and geochemical (major and trace element) data. {T}his volcanic complex is composed of two successive edifices that have experienced discontinuous volcanic activity from {M}iddle {P}leistocene to {H}olocene times. {T}he {A}mpato compound volcano consists of a basal edifice constructed over at least two cone-building stages dated at 450-400 ka and 230-200 ka {A}fter a period of quiescence, the {A}mpato {U}pper edifice was constructed firstly during an effusive stage (80-70 ka), and then by the formation of three successive peaks: the {N}orthern, {S}outhern (40-20 ka) and {C}entral cones (20-10 ka). {T}he {S}outhern peak, which is the biggest, experienced large explosive phases, resulting in deposits such as the {C}orinta plinian fallout. {D}uring the {H}olocene, eruptive activity migrated to the {NE} and constructed the mostly effusive {S}abancaya edifice. {T}his cone comprised many andesitic and dacitic blocky lava flows and a young terminal cone, mostly composed of pyroclastic material. {M}ost samples from the {A}mpato-{S}abancaya define a broad high-{K} magmatic trend composed of andesites and dacites with a mineral assemblage of plagio-clase, amphibole, biotite, ortho -and clino-pyroxene, and {F}e-{T}i oxides. {A} secondary trend also exists, corresponding to rare dacitic explosive eruptions (i.e. {C}orinta fallout and flow deposits). {B}oth magmatic trends are derived by fractional crystallisation involving an amphibole-rich cumulate with variable amounts of upper crustal assimilation. {A} marked change in the overall eruptive rate has been identified between {A}mpato (similar to 0.1 km(3)/ka) and {S}abancaya (0.6-1.7 km(3)/ka). {T}his abrupt change demonstrates that eruptive rates have not been homogeneous throughout the volcano's history. {B}ased on tephrochronologic studies, the {L}ate {H}olocene {S}abancaya activity is characterised by strong vulcanian events, although its erupted volume remained low and only produced a local impact through ash fallout. {W}e have identified at least 6 eruptions during the last 4-5 ka, including the historical {AD} 1750-1784 and 1987-1998 events. {O}n the basis of this recurrent low-to-moderate explosive activity, {S}abancaya must be considered active and a potentially threatening volcano.},
  keywords = {{A}mpato ; {S}abancaya ; {C}entral {A}ndes ; {E}ruptive chronology ; {E}ruptive rates ; {V}olcanic hazards ; {PEROU} ; {ANDES} ; {AMPATO} {VOLCAN} ; {SABANCAYA} {VOLCAN}},
  booktitle = {},
  journal = {{J}ournal of {V}olcanology and {G}eothermal {R}esearch},
  volume = {323},
  numero = {},
  pages = {110--128},
  ISSN = {0377-0273},
  year = {2016},
  DOI = {10.1016/j.jvolgeores.2016.04.038},
  URL = {https://www.documentation.ird.fr/hor/fdi:010068355},
}