Stable isotope composition of Littoridina australis from the coast of Buenos Aires province, Argentina, during Holocene climatic fluctuations

TitleStable isotope composition of Littoridina australis from the coast of Buenos Aires province, Argentina, during Holocene climatic fluctuations
Publication TypeJournal Article
Year of Publication2002
AuthorsAguirre, ML, Zanchetta, G, Fallick, AE
JournalGeobios
Volume35
Issue1
Pagination79-88
Date PublishedJan-Feb
ISSN0016-6995
Accession NumberWOS:000176258100009
KeywordsArgentina, Holocene, Littoridina australis, Molluscs, Palaeoenvironments, Stable isotopes
Abstract

Stable isotope (carbon and oxygen) analyses were performed on Littoridina australis shells collected from molluscan concentrations within Holocene littoral deposits along the Bonaerensian coastal area of Argentina (south-western Atlantic). Isotope data allow us to define two very different areas: the Samborombon Bay, where isotope composition of shells was mainly governed by mixing between marine and freshwater, and the Mar Chiquita lagoon, where the original brackish environment was dominated by evaporation of water that originated high isotope shell values. In both areas some isotope profiles show short and quite large oscillations in delta(18)O. Their origin may be tentatively explained as due to the changes in moisture regime that control freshwater supply. The results suggest that these deposits can represent natural archives potentially useful for palaeoclimate reconstruction. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.

DOI10.1016/S0016-6995(02)00011-6