Diagenetic changes in Concholepas concholepas shells (Gastropoda, Muricidae) in the hyper-arid conditions of Northern Chile - Implications for palaeoenvironmental reconstructions - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Biogeosciences Year : 2009

Diagenetic changes in Concholepas concholepas shells (Gastropoda, Muricidae) in the hyper-arid conditions of Northern Chile - Implications for palaeoenvironmental reconstructions

Abstract

Variations in the chemical composition of fossil biogenic carbonates, and in particular of mollusc shells, have been used in a range of palaeoenvironmental reconstructions. It is of primary importance, therefore, to detect and understand the diagenetic processes that may modify the original chemical signature. This microstructural and biogeochemi-cal study focuses on modern and fossil (Holocene and Pleis-tocene) shells of a littoral gastropod of Northern Chile, and on the characterization of mineral component transformations at the nanometric scale and concomitant intracrystalline organic compound modifications. The inner aragonite layer of the shell exhibits more complex deteriorations than the calcite layer. This preliminary study confirms that physical and chemical alterations of various components of mollusc shell biocrystals are complex and might manifest in different ways even within a single individual. The single criterion of determining the mineralogical composition to verify the conservation state of shell samples is insufficient.
Fichier principal
Vignette du fichier
bg-6-197-2009.pdf (1.94 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

insu-00407825 , version 1 (31-07-2020)

Licence

Attribution - NoDerivatives

Identifiers

Cite

Nury Guzmán, Yannicke Dauphin, Jean-Pierre Cuif, Alexandre Denis, Luc Ortlieb. Diagenetic changes in Concholepas concholepas shells (Gastropoda, Muricidae) in the hyper-arid conditions of Northern Chile - Implications for palaeoenvironmental reconstructions. Biogeosciences, 2009, 6 (2), pp.197-207. ⟨10.5194/bg-6-197-2009⟩. ⟨insu-00407825⟩
212 View
578 Download

Altmetric

Share

Gmail Facebook X LinkedIn More