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Crystallochemical Study of a Population of Particles in Smectites from a Lateritic Weathering Profile

Published online by Cambridge University Press:  28 February 2024

S. Petit ,
T. Prot ,
A. Decarreau ,
C. Mosser  and
M. C. Toledo-Groke
S. Petit
Affiliation:
Laboratoire de Pétrologie de la Surface, URA CNRS 721, Université de Poitiers, 40, av. du Recteur Pineau, 86022 Poitiers Cédex, France
T. Prot
Affiliation:
Laboratoire de Pétrologie de la Surface, URA CNRS 721, Université de Poitiers, 40, av. du Recteur Pineau, 86022 Poitiers Cédex, France
A. Decarreau
Affiliation:
Laboratoire de Pétrologie de la Surface, URA CNRS 721, Université de Poitiers, 40, av. du Recteur Pineau, 86022 Poitiers Cédex, France
C. Mosser
Affiliation:
Centre de Geochimie de la Surface, LP CNRS 6251, 1 rue Blessig, 67084, Strausbourg Cedex, France
M. C. Toledo-Groke
Affiliation:
Instituto de Geosciencias, USP, CP 20899, 01498, Säo Paulo, Brazil
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Abstract

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In the copper deposit of Salobo 3A (Brazil), nontronite-like clay samples were found at the bottom of the weathering blanket. Samples were fractionated first by sedimentation and then by a HGMS method. From XRD data, it was found that the samples are essentially smectite with kaolinite in very small quantities. The average structural formula of the smectite, presented in the traditional manner, is:

Chemical analyses show that the smectite samples contain a population of clay particles whose chemistry ranges between a nontronite end-member and an Al-Mg beidellite end-member.

Spectroscopic studies by FTIR, Mössbauer, and ESR show that the three major octahedral cations (Al, Fe, Mg) are present in each octahedral sheet of the smectite, forming a solid solution, and that the chemical trends of the smectite clay detected at a “macroscopic” scale (associated clay particles) can also be observed at the unit cell scale.

Keywords

Crystal-chemistryESRFTIRLayer structural compositionMössbauerNontroniteSmectiteSolid-solution
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 4 , August 1992 , pp. 436 - 445
Copyright
Copyright © 1992, The Clay Minerals Society

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