Diagenetic changes in <i>Concholepas concholepas</i> shells (Gastropoda, Muricidae) in the hyper-arid conditions of Northern Chile – implications for palaeoenvironmental reconstructions - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Biogeosciences Discussions Année : 2008

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

Résumé

Variations on chemical composition in fossil biogenic carbonates, and in particular of mollusk shells, have been used in a range of palaeoenvironmental reconstructions. Therefore, it is of primary importance to detect and understand the diagenetic processes that may modify the original chemical signature. This microstructural and biogeochemical study focuses on modern and fossil (Pleistocene and Holocene) 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 mollusk shell biocrystals are complex and might manifest in different ways even within a single individual. The single criterion of determining the mineralogical composition to attest shell sample conservation state should not be considered as sufficient.
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Dates et versions

hal-00330282 , version 1 (18-06-2008)

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Nury Guzmán, Yannicke Dauphin, Jean-Pierre Cuif, A. Denis, Luc Ortlieb. Diagenetic changes in Concholepas concholepas shells (Gastropoda, Muricidae) in the hyper-arid conditions of Northern Chile – implications for palaeoenvironmental reconstructions. Biogeosciences Discussions, 2008, 5 (1), pp.501-530. ⟨10.5194/bgd-5-501-2008⟩. ⟨hal-00330282⟩
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