Diatom based transfer function for estimating the chemical composition of fossil water. Calibration based on salt lakes of the Lipez areain the southwestern Bolivian Altiplano.

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URI: http://hdl.handle.net/2042/4566  |   DOI : https://doi.org/10.4267/2042/4566
Title: Diatom based transfer function for estimating the chemical composition of fossil water. Calibration based on salt lakes of the Lipez areain the southwestern Bolivian Altiplano.
Author: SERVANT-VILDARY, Simone; RISACHER, François; ROUX, Maurice
Abstract: Diatom assemblages and water chemistry were studied in 13 shallow salt lakes in the southern part of the Bolivian Altiplano. At each locality bottom sediment and water samples were collected simultaneously. Relationships between the composition of the diatom assemblages and variations in water chemistry were collated in order to permit the estimation of ancient water chemistries based on changes in the make up of fossil diatom associations in older sediments. Weighted Averages treated by Partial Least Squares regression (WA and WA-PLS methods) allowed an estimation of optima and the relative tolerances of 61 species to variations in salinity and to the relative quantities of the 15 chemical elements studied, among them boron and lithium.
Description: L'étude des assemblages de diatomées et de la composition chimique des eaux a été effectuée dans 13 lacs salés peu profonds localisés dans le Sud de l'Altiplano Bolivien. Les points et les dates de prélèvement sont les mêmes pour les deux types d'étude. Les relations entre les assemblages de diatomées et les variables chimiques mesurées sont effectuées dans le but d'estimer ces variables dans le passé à partir des diatomées fossiles conservées dans les sédiments. La méthode des moyennes pondérées (WA et WA-PLS régression) a permis d'estimer les optima et les tolérances de 61 espèces à la salinité et aux différents éléments chimiques dont le bore et le lithium.
Subject: Flora; diatom; Bolivia; Quaternary; water ionic content; water chemistry; transferfunction; ecology; Flore ; diatomée ; Bolivie ; Quaternaire ; composition ionique ; chimie des eaux ;fonction de transfert ; écologie
Publisher: Association "Carnets de Géologie"
Date: 2002

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