@article{fdi:010044804,
  title = {{T}emporal evolution of magmatism in the {N}orthern {V}olcanic {Z}one of the {A}ndes : the geology and petrology of {C}ayambe {V}olcanic {C}omplex ({E}cuador)},
  author = {{S}amaniego, {P}ablo and {M}artin, {H}. and {M}onzier, {M}ichel and {R}obin, {C}. and {F}ornari, {M}ichel and {E}issen, {J}ean-{P}ierre and {C}otten, {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n the {N}orthern {V}olcanic {Z}one of the {A}ndes, the {C}ayambe {V}olcanic {C}omplex consists of: (1) a basal, mostly effusive volcano, the {V}iejo {C}ayambe, whose lavas (andesites and subordinate dacites and rhyolites) are typically calc-alkaline; and (2) a younger, essentially dacitic, composite edifice, the {N}evado {C}ayambe, characterized by lavas with adakitic signatures and explosive eruptive styles. {T}he construction of {V}iejo {C}ayambe began > 1.1 {M}yr ago and ended at similar to 1.0 {M}a. {T}he young and still active {N}evado {C}ayambe grew after a period of quiescence of about 0.6 {M}yr, from similar to 0.4 {M}a to {H}olocene. {I}ts complex history is divided into at least three large construction phases ({A}ngureal cone, {M}ain {S}ummit cone and {S}econdary {S}ummit cone) and comprises large pyroclastic events, debris avalanches, as well as periods of dome activity. {G}eochemical data indicate that fractional crystallization and crustal assimilation processes have a limited role in the genesis of each suite. {O}n the contrary, field observations, and mineralogical and geochemical data show the increasing importance of magma mixing during the evolution of the volcanic complex. {T}he adakitic signature of {N}evado {C}ayambe magmas is related to partial melting of a basaltic source, which could be the lower crust or the subducted slab. {H}owever, reliable geophysical and geochemical evidence indicates that the source of adakitic component is the subducted slab. {T}hus, the {V}iejo {C}ayambe magmas are inferred to come from a mantle wedge source metasomatized by slab-derived melts (adakites), whereas the {N}evado {C}ayambe magmas indicate a greater involvement of adakitic melts in their petrogenesis. {T}his temporal evolution can be related to the presence of the subducted {C}arnegie {R}idge, modifying the geothermal gradient along the {W}adati-{B}enioff zone and favouring slab partial melting.},
  keywords = {adakites ; {A}r 40/{A}r 39 dating ; {C}ayambe volcano ; {E}cuador ; mantle metasomatism ; {A}ndes},
  booktitle = {},
  journal = {{J}ournal of {P}etrology},
  volume = {46},
  numero = {11},
  pages = {2225--2252},
  ISSN = {0022-3530},
  year = {2005},
  DOI = {10.1093/petrology/egi053},
  URL = {https://www.documentation.ird.fr/hor/fdi:010044804},
}