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L'alteration lateritique debutante des pyroxenites de Jacuba, Niquelandia, Bresil

Published online by Cambridge University Press:  09 July 2018

F. Colin ,
Y. Noack ,
J. -J. Trescases  and
D. Nahon
F. Colin
Affiliation:
Laboratoire de Pétrologie de la Surface, ERA au CNRS n° 220, 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex, France
Y. Noack
Affiliation:
Laboratoire de Pétrologie de la Surface, ERA au CNRS n° 220, 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex, France
J. -J. Trescases
Affiliation:
Laboratoire de Pétrologie de la Surface, ERA au CNRS n° 220, 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex, France
D. Nahon
Affiliation:
Laboratoire de Pétrologie de la Surface, ERA au CNRS n° 220, 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex, France
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Resume

L'altération latéritique débutante des orthopyroxènes et clinopyroxènes de Niquelandia, Brésil, montre plusieurs stades. Le premier stade facultatif est la formation de produits ‘amorphes’ dont la composition chimique proche de celle des minéraux parentaux, montre déjà un enrichissement en nickel. Le deuxième stade est marqué par l'apparition de phyllosilicates dont la nature et la composition chimique varient selon le degré de porosité de la roche parentale. Cette porosité contrôle également la distribution du nickel dans les différents phyllosilicates, (saponite, talc, pimélite). Les pyroxènes ne contenant pas ou très peu de nickel, il est clair que le nickel qui s'accumule dans les produits de l'altération est totalement importé avec les eaux de percolation. L'origine de ce nickel est à rechercher plus haut dans les profils ou plus en amont dans la séquence, là où les dunites sont présentes.

Abstract

Abstract

The initial weathering products under lateritic conditions of orthopyroxenes and clinopyroxenes in Jacuba, Niquelandia, Brasil, are amorphous and have chemical compositions very near those of the parent minerals but with enrichment of Ni. Later products are phyllosilicates such as talc, saponite and pimelite, the nature and composition of which vary with the development of porosity and fissuring of the parent rock. It appears that Ni distribution between these phyllosilicates is also controlled by fissure development. As the parent pyroxenes are Ni-depleted, it is clear that Ni accumulation in the structures of the phyllosilicate weathering products is a result of solution transfer from other parts of the profile.

Type
Research Article
Information
Clay Minerals , Volume 20 , Issue 1 , March 1985 , pp. 93 - 113
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985

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