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Chlorites and chloritic mixed-layer minerals in profiles on ultrabasic rocks from Moyango (Ivory Coast) and Angiquinho (Brazil)

Published online by Cambridge University Press:  09 July 2018

Y. Noack  and
F. Colin
Y. Noack
Affiliation:
Laboratoire de Pétrologie de la Surface et U.A. 721, CNRS, Université de Poitiers, 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex
F. Colin
Affiliation:
ORSTOM, 24 Rue Bayard, 75008 Paris Cedex, France
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Abstract

Different types of chlorite and related mixed-layer minerals have been found in profiles developed on ultrabasic rocks of Ivory Coast and Brazil. Normal chlorites, with low K and Ni contents, are of hydrothermal origin and are situated at the bottom of the alteration profile. At the top of the profile the mixed-layer minerals are Ni-chlorite/vermiculite, which formed under weathering conditions, or K-chlorite/vermiculite, resulting from the alteration of mica. The Ni-content of the chlorite/vermiculite can reach 10% NiO.

Type
Research Article
Information
Clay Minerals , Volume 21 , Issue 2 , June 1986 , pp. 171 - 182
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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