Patagonian origin of glacial dust deposited in East Antarctica (Vostok and Dome C) during glacial stages 2, 4 and 6 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Earth and Planetary Science Letters Année : 1997

Patagonian origin of glacial dust deposited in East Antarctica (Vostok and Dome C) during glacial stages 2, 4 and 6

Fe Grousset
  • Fonction : Auteur
Michel Revel
  • Fonction : Auteur
Jr Petit
  • Fonction : Auteur
Pe Biscaye
  • Fonction : Auteur
Ni Barkov
  • Fonction : Auteur

Résumé

The source area of continental dust deposited at both Vostok and Dome C sites (East Antarctica) during the glacial stages (stage 2: similar to 18 ka (Last Glacial Maximum), stage 4: similar to 60 ka and stage 6: similar to 160 ka) of the last two climatic cycles has remained constant. The isotopic composition (Sr-87/Sr-86 and Nd-143/Nd-114) of the ice-core dust has been compared with the isotopic composition of the potential source areas: Antarctica, New Zealand, Southern Africa, Australia and South America. This comparison reveals the southern South American provenance of the dust for all three glacial periods, as has already been shown for the LGM [1], We show that the Patagonian loess and the marine shelf sediments from the Argentine continental shelf, which was variably emerged during glacial periods, display different isotopic compositions and that the composition of the Patagonian loess best matches the signature of the ice-core dust, The identification of the Patagonian region as the source of the windblown dust deposited over East Antarctica during all the latest glacial periods permits a better understanding of paleo-atmospheric circulations of the last climatic cycles and a better constraint on the parametrization of dust sources for paleoatmospheric general circulation models.

Domaines

Glaciologie

Dates et versions

hal-00756606 , version 1 (23-11-2012)

Identifiants

Citer

Isabelle Basile-Doelsch, Fe Grousset, Michel Revel, Jr Petit, Pe Biscaye, et al.. Patagonian origin of glacial dust deposited in East Antarctica (Vostok and Dome C) during glacial stages 2, 4 and 6. Earth and Planetary Science Letters, 1997, 146 (3-4), pp.573-589. ⟨10.1016/s0012-821x(96)00255-5⟩. ⟨hal-00756606⟩
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