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| Titel |
Diagenetic changes in Concholepas concholepas shells (Gastropoda, Muricidae) in the hyper-arid conditions of Northern Chile – implications for palaeoenvironmental reconstructions |
| VerfasserIn |
N. Guzmán, Y. Dauphin, J. P. Cuif, A. Denis, L. Ortlieb |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 2 ; Nr. 6, no. 2 (2009-02-16), S.197-207 |
| Datensatznummer |
250003430
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| Publikation (Nr.) |
 copernicus.org/bg-6-197-2009.pdf |
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| Zusammenfassung |
| 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 biogeochemical
study focuses on modern and fossil (Holocene and Pleistocene) 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. |
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