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Formation and distribution of Mg, Fe, Mn-smectites in the first stages of the lateritic weathering of forsterite and tephroite

Published online by Cambridge University Press:  09 July 2018

D. Nahon
Affiliation:
Laboratoire de Pétrologie de la Surface and ERA du CNRS no 220, Université de Poitiers, 40 Avenue du Recteur Pineau 86022 Poitiers Cedex
F. Colin
Affiliation:
Laboratoire de Pétrologie de la Surface and ERA du CNRS no 220, Université de Poitiers, 40 Avenue du Recteur Pineau 86022 Poitiers Cedex
Y. Tardy
Affiliation:
Centre de Sédimentologie et de Géochimie de la Surface, Université Louis Pasteur, 1, rue Blessig 67084 Strasbourg Cedex, France

Abstract

During weathering of forsterite and tephroite under the humid, tropical conditions of the Ivory Coast, intermediate Mg,Fe3+− or Mn2+-smectites appear prior to widespread development of iron or manganese oxyhydroxides. In forsterite, the smectite varies from an Mg-trioctahedral variety near the centres of altered crystals to an Mg,Fe3+,Al-di/trioctahedral variety near the edges. The Al-content of this latter smectite is supplied by dissolution of adjacent minerals, notably enstatite. An Mn2+-trioctahedral smectite forms in cracks in tephroite crystals.

Resume

Resume

Au cours de l'altération de la forstérite et de la téphroïte sous les conditions humides et tropicales de la Côte d'Ivoire, des smectites Mg, Fe3+ ou Mn2+ apparaissent avant les oxyhydroxydes de fer et de manganèse largement répandus. Dans la forstérite, la smectite peut se présenter sous forme d'une variété Mg-trioctaédrique près des centres des cristaux altérés jusqu'à une variété Mg, Fe3+, Al di et trioctaédrique près des bords. L'aluminium nécessaire à cette dernière espèce est fournie par la dissolution de minéraux adjacents, essentiellement de l'enstatite. Une smectite Mn2+ trioctaédrique se forme dans les fentes des cristaux de téphroïte.

Kurzreferat

Kurzreferat

Bei der Verwitterung von Forsterit und Tephroit unter den humiden, tropischen Bedingungen der Elfenbeinküste erscheinen intermediäre MgFe3+− oder Mn2+- Smectite vor der weitverbreiteten Bildung von Eisen- oder Mangan-oxyhydroxiden. In Forsterit überstreicht der Smectit einen Bereich von einer Mg-trioktaedrischen Varietät in der Nähe der umgewandelten Kristalle zu einer Mg, Fe3+, Al-di/trioktaedrischen Varietät nahe den Ecken. Der Al-Gehalt des letzteren Smectits wird durch die Auflösung benachbarter Minerale, zuerst Enstatit, erhöht. Ein Mn2+-trioktaedrischer Smectit bildet sich in den Rissen von Tephroit-Kristallen.

Resumen

Resumen

Durante la meteorización de la fosterita y la tefroita en las condiciones húmedas y tropicales de la Costa de Marfil, aparecen esmectitas -Mg, -Fe+3 ó Mn+2 previamente a la formación generalizada de oxihidróxidos de hierro y manganeso. En el caso de los cristales alterados de fosterita, se encuentra una gradación en composición que va desde una esmectita Mg-trioctaédrica en el centro de los cristales a una esmectita Mg, Fe+3, Al-di/trioctaédrica cerca de los bordes. El contenido en aluminio de estra última esmectita proviene de la disolución de los minerales adyacentes, en particular enstatita. En las grietas de los cristales de tefroita se forma una esmectita Mn+2-trioctaédrica.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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Formation and distribution of Mg, Fe, Mn-smectites in the first stages of the lateritic weathering of forsterite and tephroite
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