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American Mineralogist; November 2005; v. 90; no. 11-12; p. 1748-1758; DOI: 10.2138/am.2005.1640
© 2005 Mineralogical Society of America
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Speciation and distribution of sulfur in a mollusk shell as revealed by in situ maps using X-ray absorption near-edge structure (XANES) spectroscopy at the S K-edge

Yannicke Dauphin1,*, Jean-Pierre Cuif1, Murielle Salomé2 and Jean Susini2

1 UMR IDES, Bât 504, Université Paris XI-Orsay, F-91405 Orsay cedex, France
2 European Synchrotron Radiation Facility (ESRF), X-ray Microscopy Beamline ID21, BP 220, F-38043 Grenoble Cedex, France

Correspondence: * E-mail: dauphin{at}geol.u-psud.fr

The microstructure and composition, including chemical speciation of S, of the calcitic and aragonitic shell layers of two mollusc shells were investigated using a combination of thermogravimetric analyses, scanning electron microscopy, electron probe microanalyses, and X-ray absorption near-edge structure spectroscopy. Microprobe analyses show the different chemical contents of the shell layers, whereas in situ XANES maps and spectra show the dominance of organic sulfate over S aminoacids (cysteine, cystine, and methionine). Also, the distribution of S species is different for different structures within the shell. Growth lines are clearly seen in the chemical species maps. These results suggest that studies focussing exclusively on the protein contents of biominerals are not sufficient to understand the role of the organic matrices in the biomineralization and diagenetic processes.




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J. Feng, Y. J. Lee, R. J. Reeder, and B. L. Phillips
Observation of bicarbonate in calcite by NMR spectroscopy
American Mineralogist, May 1, 2006; 91(5-6): 957 - 960.
[Abstract] [Full Text] [PDF]


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