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Auteurs :
Couchoud, Isabelle

Description :

International audience

Ideal cyclone-sensitive speleothems would have the following properties: active at the time of sampling and recording the past few millenia, with fast growth rate, made of clean primary calcite, precipitated without kinetic fractionation, and fed by water with a short residence time allowing for the isotopic signal of short events like cyclones to be transferred but long enough for the drip water to be supersaturated. The screening for this type of speleothem is still in progress and the results presented here are very preliminary. U-Th dating: low U concentration (9-40ng/g; host rock is reef limestone) ; significant detrital content, involving large corrections and large final age uncertainties. Growth rate is highly variable, from ~0.12 mm/yr to ~0.03mm/yr. Tau12A: δ 18 O profile shows some quite large variations (~3‰), with several abrupt events that we will try to identify in other archives. δ 13 C signal amplitude is very large (~-4 to ~-14‰) suggesting the effect of prior calcite precipitation. The δ 18 O signal gets heavier when the δ 13 C does, which could reflect the rainfall amount in this context. Var12C: δ 18 O profile shows values between-3.1 and-6.3‰, with decadal or centennial fluctuations, superimposed on a general trend which is consistent with the one of the δ 13 C profile without being correlated, which implies that calcite precipitation could occur in conditions close to isotopic equilibrium. Once properly dated, this record should provide interesting information about past rainfall regimes on the island.



Mots-clés :
station météorologique - activité cyclonique - spéléothème - Pacifique central - atoll - archipel des Australes - [SHS.GEO] Humanities and Social Sciences/Geography - [SDU] Sciences of the Universe [physics] - [SDU.OCEAN] Sciences of the Universe [physics]/Ocean - Atmosphere - [SDU.STU.ME] Sciences of the Universe [physics]/Earth Sciences/Meteorology

Editeur :
HAL CCSD

Langue :
en

Type de document :
info:eu-repo/semantics/conferenceObject, Poster communications

Source :
Climate Change: The Karst Record VII (KR7); https://hal.archives-ouvertes.fr/hal-01261372; Climate Change: The Karst Record VII (KR7), Sep 2014, Melbourne, Australia. 1 p., <10.1007/s00382-013-2035-y>

Date :
2014-09-29

Contributeurs :
Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) ; Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]) - Centre National de la Recherche Scientifique (CNRS)
Pôle de recherche pour l'organisation et la diffusion de l'information géographique (PRODIG) ; Université Panthéon-Sorbonne (UP1) - Institut de Recherche pour le Développement (IRD) - École pratique des hautes études (EPHE) - Université Paris-Sorbonne (UP4) - AgroParisTech - Université Paris Diderot - Paris 7 (UPD7) - Centre National de la Recherche Scientifique (CNRS)
Department of Resource Management and Geography ; University of Melbourne
School of Earth Sciences [Victoria] ; University of Melbourne
Department of Geology and Palaeontology ; University of Innsbruck

Identifiants :
hal-01261372
https://hal.archives-ouvertes.fr/hal-01261372
https://hal.archives-ouvertes.fr/hal-01261372/document
https://hal.archives-ouvertes.fr/hal-01261372/file/Poster%20KR7_Polynesie.pdf
DOI : 10.1007/s00382-013-2035-y

Relations :

info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-013-2035-y Couverture :

Melbourne, Australia