Seeking cyclonic activity records in speleothems from central Pacific: preliminary sample screening - Environnement, Dynamiques et Territoires de la Montagne Accéder directement au contenu
Poster De Conférence Année : 2014

Seeking cyclonic activity records in speleothems from central Pacific: preliminary sample screening

Résumé

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.
Fichier principal
Vignette du fichier
Poster KR7_Polynesie.pdf (9.08 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01261372 , version 1 (25-01-2016)

Identifiants

Citer

Isabelle Couchoud, Samuel Etienne, Russell N. Drysdale, John C. Hellstrom, Christoph Spötl, et al.. Seeking cyclonic activity records in speleothems from central Pacific: preliminary sample screening. Climate Change: The Karst Record VII (KR7), Sep 2014, Melbourne, Australia. 1 p., ⟨10.1007/s00382-013-2035-y⟩. ⟨hal-01261372⟩
393 Consultations
792 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More