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Distribution of sulphated polysaccharides within calcareous biominerals suggests a widely shared two-step crystallization process for the microstructural growth units

Published online by Cambridge University Press:  05 July 2018

J. P. Cuif*
Affiliation:
UMR 8148 IDES, Bat. 504 Géologie, Faculté des Sciences, Orsay, F-91405, France
Y. Dauphin
Affiliation:
UMR 8148 IDES, Bat. 504 Géologie, Faculté des Sciences, Orsay, F-91405, France
B. Farre
Affiliation:
UMR 8148 IDES, Bat. 504 Géologie, Faculté des Sciences, Orsay, F-91405, France
G. Nehrke
Affiliation:
AWI-Polar Research Institute, Postfach 120161, Bremerhaven, D- 27515, Germany
J. Nouet
Affiliation:
UMR 8148 IDES, Bat. 504 Géologie, Faculté des Sciences, Orsay, F-91405, France
M. Salomé
Affiliation:
ESRF, 6 rue J. Horowitz, BP 220, Grenoble Cedex 9, F-38043, France

Abstract

Synchrotron-based XANES characterization of sulphated sulphur combined with atomic force microscopy and transmission electron microscopy (imaging and diffraction) allow insights into the crystallization of the calcareous units produced by invertebrates. As a result of a series of converging data, reticulate crystallization of the amorphous Ca-carbonate molecules conveyed to the micron-thick growth layer by the sumicrometric organo-mineral units seems a reasonable hypothesis, providing us with a method of explaining the multiple and taxonomy-linked ‘vital effects’ which have long been recognized among the calcareous biocrystals.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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