@article{fdi:010079019,
  title = {{G}lass shard {K}-{A}r dating of the {C}halupas caldera major eruption : main {P}leistocene stratigraphic marker of the {E}cuadorian volcanic arc},
  author = {{B}ablon, {M}. and {Q}uidelleur, {X}. and {S}iani, {G}. and {S}amaniego, {P}ablo and {L}e {P}ennec, {J}ean-{L}uc and {N}ouet, {J}. and {L}iorzou, {C}. and {S}antamaria, {S}. and {H}idalgo, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{N}ew {K}-{A}r ages obtained on juvenile pumice glass shards indicate that the {C}halupas ignimbrite, one of the main {P}leistocene tephra markers of the {E}cuadorian arc, was emplaced at 216 +/- 5 ka. {M}orphology and major and trace element contents of the glass shards are similar to those of ash layers from deep-sea cores and allow correlation between continental deposits and marine tephra layers. {B}ased on biostratigraphy and delta {O}-18 data, the age models of these cores support our {K}-{A}r age. {F}ine ashes from the {C}halupas eruption column have been found about 1000 km away from the source caldera, and the estimated deposit volume of both ignimbrite and co-ignimbrite deposits ranges from 200 to 265 km(3). {T}his suggests that the {C}halupas event could have been strong enough to reach the stratosphere and inject large amount of {SO}2 in both hemispheres, possibly impacting global temperatures. {I}n addition, the age of the {C}halupas ignimbrite obtained here could provide a new radiometric constraint for the age of isotope stage 7 recorded in orbitally-tuned delta {O}-18 deep-sea cores. {T}his study highlights the relevance of {K}-{A}r dating applied to small glass shards from massive ignimbrite deposits, and the potential that it represents to improve risk assessments in volcanic zones where dating crystals is not possible. {F}inally, detailed tephrochronology of deep-sea cores and correlation between marine ash-layers and continental volcanic deposits constitute a strong tool to investigate the eruptive history of an active volcanic arc whose proximal products have been eroded or deeply buried by younger deposit sequences.},
  keywords = {{K}-{A}r dating ; {G}lass shards ; {E}cuador ; {C}halupas ; {I}gnimbrite eruption ; {EQUATEUR} ; {CHALUPAS} {VOLCAN}},
  booktitle = {},
  journal = {{Q}uaternary {G}eochronology},
  volume = {57},
  numero = {},
  pages = {art. 101053 [12 p.]},
  ISSN = {1871-1014},
  year = {2020},
  DOI = {10.1016/j.quageo.2020.101053},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079019},
}