@article{fdi:010061827,
  title = {{P}aleomagnetic study of juvenile basaltic-andesite clasts from {A}ndean pyroclastic density current deposits},
  author = {{R}operch, {P}. and {C}hauvin, {A}. and {L}e {P}ennec, {J}ean-{L}uc and {L}ara, {L}. {E}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}dditional paleomagnetic data are necessary to improve geomagnetic models of secular variation during the {H}olocene, especially from the southern hemisphere. {I}n most of the {A}ndean volcanoes from {E}cuador to the {C}hilean central volcanic zone, very well dated lava flows are rare. {I}n contrast, andesitic to basaltic pyroclastic density current ({PDC}) deposits commonly contain charcoal, facilitating their age determination with {C}-14. {I}n this study we present the magnetic properties and the paleomagnetic results obtained from three {PDC} deposits of basaltic to andesitic composition. {O}ne is the 2006 {PDC} deposit from the {E}cuadorian {T}ungurahua volcano and the two others are well-dated {PDC} deposits from {C}hilean volcanoes {O}sorno and {V}illarica. {A}lthough most paleomagnetic studies in pyroclastic rocks deal with the estimation of emplacement temperatures from bulk deposits or accessory and accidental (non-juvenile) clasts, we show that juvenile clasts embedded in {PDC} deposits provide well-grouped paleomagnetic directions indicating post-emplacement in situ cooling below {C}urie points. {M}oreover, the rapid cooling of the juvenile clasts yields an abundance of single domain titanomagnetite grains providing low unblocking temperatures and a reliable material for paleointensity determination.},
  keywords = {{P}aleomagnetism ; {S}ecular variation ; {P}aleointensity ; {P}yroclastic flow ; {ANDES} ; {EQUATEUR}},
  booktitle = {},
  journal = {{P}hysics of the {E}arth and {P}lanetary {I}nteriors},
  volume = {227},
  numero = {},
  pages = {20--29},
  ISSN = {0031-9201},
  year = {2014},
  DOI = {10.1016/j.pepi.2013.11.008},
  URL = {https://www.documentation.ird.fr/hor/fdi:010061827},
}