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Domain Segregation in Ni-Fe-Mg-Smectites

Published online by Cambridge University Press:  02 April 2024

A. Decarreau ,
F. Colin ,
A. Herbillon ,
A. Manceau ,
D. Nahon ,
H. Paquet ,
D. Trauth-Badaud  and
J. J. Trescases
A. Decarreau
Affiliation:
Laboratoire de Géochimie des Roches Sédimentaires, UA-CNRS 723, Université Paris XI, bât. 504, 91405 Orsay Cédex, France Laboratoire pour l'Utilisation du Rayonnement Electromagnétique (LURE), CNRS, 91405 Orsay, France
F. Colin
Affiliation:
Laboratoire de Pétrologie de la Surface, UA-CNRS 721, Université de Poitiers, 40 avenue du Recteur Pineau, 86022 Poitiers Cédex, France
A. Herbillon
Affiliation:
Groupe de Physico-Chimie Minérale et de Catalyse, Université Catholique de Louvain, Place Croix du Sud 1, 1348 Louvain la Neuve, Belgique
A. Manceau
Affiliation:
Laboratoire de Minéralogie-Cristallographie, UA-CNRS 9, Universités Paris VI et VII, 4 place Jussieu, 75252 Paris Cédex 05, France Laboratoire pour l'Utilisation du Rayonnement Electromagnétique (LURE), CNRS, 91405 Orsay, France
D. Nahon
Affiliation:
Laboratoire de Pétrologie de la Surface, UA-CNRS 721, Université de Poitiers, 40 avenue du Recteur Pineau, 86022 Poitiers Cédex, France
H. Paquet
Affiliation:
Centre de Sédimentologie et Géochimie de la Surface du CNRS, 1 rue Blessig, 67084 Strausbourg Cédex, France
D. Trauth-Badaud
Affiliation:
Laboratoire de Géochimie des Roches Sédimentaires, UA-CNRS 723, Université Paris XI, bât. 504, 91405 Orsay Cédex, France
J. J. Trescases
Affiliation:
Laboratoire de Pétrologie de la Surface, UA-CNRS 721, Université de Poitiers, 40 avenue du Recteur Pineau, 86022 Poitiers Cédex, France
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Abstract

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The first stage of lateritic weathering of pyroxenes in the Niquelandia area, Brazil, leads either to Fe-rich products or to a phyllosilicate clay. In relatively unfractured parent rock the phyllosilicate clay contains Ni-rich smectites, the atomic ratio of Ni: octahedral cations ranging from 0.3 to 0.5. These smectites were studied by polarized light microscopy, X-ray powder diffraction (XRD), transmission electron microscopy, and electron microprobe, and infrared, optical absorption, Mössbauer, and extended X-ray absorption fine-structure (EXAFS) spectroscopy. The chemical composition of the smectite is constant on the optical microscope scale even to the smallest analyzed particles (3000 A in diameter and about 75 Å thick). From XRD data the mineral is principally a swelling, trioctahedral smectite; however, some kerolite-pimelite-like layers are present, and a weak 06,33 reflection indicates the presence of a small amount of a dioctahedral phase. Mössbauer results show that all Fe cations are Fe3+ in octahedral sites. The structural formula of the smectite is: (Ca0.01K0.05)(Al0.17Fe0.5Mg0.48Ni1.47Cr0.02)(Si3.92Al0.08)O10(OH)2

The results obtained from all the above methods suggest that in the smectites Ni, and, perhaps, a small amount of Mg are clustered in pimelite-like domains (or layers), whereas Fe and some Al are clustered in nontronite-like domains (or layers). Most selected-area electron diffraction patterns exhibit continuous or punctuated (hk) rings, indicating that particles contain several stacked layers. The patterns of some thin particles, however, suggest dioctahedral layers having trans-octahedral vacancies, such as in the Garfield, Washington, nontronite. Thus, the Ni-Fe-Mg-smectite, which seemingly is homogeneous, actually consists of mixed trioctahedral and dioctahedral layers or domains.

Keywords

Chemical compositionLateriteMössbauer spectroscopyNickelNontronitePimeliteSmectiteTransmission electron microscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 35 , Issue 1 , February 1987 , pp. 1 - 10
Copyright
Copyright © 1987, The Clay Minerals Society

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