Source identification of volcanic ashes by geochemical analysis of well preserved lacustrine tephras in Nahuel Huapi National Park.

@article{Daga2008SourceIO,
  title={Source identification of volcanic ashes by geochemical analysis of well preserved lacustrine tephras in Nahuel Huapi National Park.},
  author={Romina Daga and Sergio Ribeiro Guevara and Mar{\'i}a Lidia S{\'a}nchez and Maria G Arribere},
  journal={Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine},
  year={2008},
  volume={66 10},
  pages={1325-36}
}
Well preserved volcanic ashes produced in recent events, recovered from sedimentary sequences extracted from three lakes belonging to Nahuel Huapi National Park, Northern Patagonia, were geochemically characterized in order to reveal patterns that allow the identification of the source. Two water bodies are situated in the direct impact area of volcanoes Calbuco and Puyehue-Cordón Caulle, while the third, lake Moreno, is situated in-between. The sedimentary sequences were dated by (210)Pb and… CONTINUE READING

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ChromiumNo subtypeHafnium
The geochemical parameters that showed decisive differences were SiO(2 ) and Na(2)O+K(2)O contents , the Eu anomaly , Rare Earth element ratios ; the concentration of incompatible elements Cs , Rb , Th , Hf , Ta and Zr , and the compatible elements Cr and V. The six upper tephra layers extracted from lake Moreno showed geochemical patterns that allowed clear association with Calbuco and Puyehue - Cordón Caulle sources .
HafniumNo subtypeChromium
The geochemical parameters that showed decisive differences were SiO(2 ) and Na(2)O+K(2)O contents , the Eu anomaly , Rare Earth element ratios ; the concentration of incompatible elements Cs , Rb , Th , Hf , Ta and Zr , and the compatible elements Cr and V. The six upper tephra layers extracted from lake Moreno showed geochemical patterns that allowed clear association with Calbuco and Puyehue - Cordón Caulle sources .
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