Hostname: page-component-78c5997874-fbnjt Total loading time: 0 Render date: 2024-11-08T00:04:21.312Z Has data issue: false hasContentIssue false
  • English
  • Français

Evolution of Clay Minerals in a Chronosequence of Poldered Sediments Under the Influence of a Natural Pasture Development

Published online by Cambridge University Press:  01 January 2024

B. Velde ,
B. Goffé  and
A. Hoellard
B. Velde*
Affiliation:
Laboratoire de Géologie, UMR 8538 CNRS Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris, France
B. Goffé
Affiliation:
Laboratoire de Géologie, UMR 8538 CNRS Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris, France
A. Hoellard
Affiliation:
Laboratoire de Géologie, UMR 8538 CNRS Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris, France
*
*E-mail address of corresponding author: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Clay minerals appear to change significantly under the influence of pasture development on poldered sediments in the Baie d'Authie area (Somme, France). Cores 40–90 cm deep from recent salt marsh sediments and poldered sediments developing grass pastures since 1737, 1575 and 1158 indicate that the natural mineral suite of kaolinite, mica, illite, and two disordered mixed-layered illite-smectite (I-S) phases common to the sedimentary input changes gradually but significantly in the materials. In the oldest, best-developed profile, there is a dominance of a disordered, illitic I-S in the humic upper part of the profile and a more abundant, more smectitic I-S mineral below. It appears that grass-derived humic materials tend to stabilize closed (collapsed) or illitic behavior in I-S clays. The natural evolution of the sediment (lower part of the profile) is towards a smectitic clay assemblage. Destruction of organic matter of the smectitic I-S minerals by oxidation indicates that this material can significantly modify the physical behavior of the clays keeping the structure open to polar molecules.

Keywords

Mixed-layer MineralsPrairie SoilsSalt Marsh Sediments
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 2 , April 2003 , pp. 205 - 217
Copyright
Copyright © 2003, The Clay Minerals Society

References

BRGM, Bureau Recherches Miniére et Géologique, Geological map XX-I, Rue 1–50,000 (1981) France Orléans.Google Scholar
Gharrabi, M. and Velde, B., (1995) Clay mineral evolution in the Illinois Basin and its causes Clay Minerals 30 353–364 10.1180/claymin.1995.030.4.08.Google Scholar
Hamiot, S., (1999) Les Aménagements Littoraux et leurs Impacts en Plaine Maritime Picardie France SMACOPI 73 pp.Google Scholar
Inoue, A. Bouchet, A. Velde, B. and Meunier, A., (1989) Convenient technique for estimating smectite layer percentages in randomly interstratified illite-smectite Clays and Clay Minerals 37 227–234 10.1346/CCMN.1989.0370305.Google Scholar
Lanson, B., (1997) Decomposition of experimental X-ray diffraction patterns (profile fitting): A convenient way to study clay minerals Clays and Clay Minerals 45 132–146 10.1346/CCMN.1997.0450202.Google Scholar
Moore, D. and Reynolds, R.C., (1997) X-ray Diffraction and the Analysis of Clay Minerals 2nd Oxford, UK Oxford University Press 378 pp.Google Scholar
Reynolds, R.C., (1985) NEWMOD. A computer program for the calculation of one dimensional patterns of mixed layer clays 8 Brook Rd, Hanover, New Hampshire, USA Published by the author, R.C. Reynolds.Google Scholar
Righi, D. Velde, B. and Meunier, A., (1995) Clay stability in clay-dominated soil systems Clay Minerals 30 45–54 10.1180/claymin.1995.030.1.05.Google Scholar
USDA Soil Soil Survey Staff (1998) Keys to Taxonomy. US Printing Office, 326 pp.Google Scholar
Velde, B., (2001) Clay minerals in the agricultural surface soils in the Central United States Clay Minerals 36 277–294 10.1180/000985501750539391.Google Scholar