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Occurrence of a ferrous, trioctahedral smectite in Recent sediments of Atlantis II Deep, Red Sea

Published online by Cambridge University Press:  09 July 2018

D. Badaut ,
G. Besson ,
A. Decarreau  and
R. Rautureau
D. Badaut
Affiliation:
Laboratoire de Géochimie, ERA 765 du CNRS, Université de Paris-Sud, 91405 Orsay Cedex
G. Besson
Affiliation:
Laboratoire de Cristallographie, ERA 841 du CNRS, Université d'Orléans, 45046 Orleans Cedex, France
A. Decarreau
Affiliation:
Laboratoire de Géochimie, ERA 765 du CNRS, Université de Paris-Sud, 91405 Orsay Cedex
R. Rautureau
Affiliation:
Laboratoire de Cristallographie, ERA 841 du CNRS, Université d'Orléans, 45046 Orleans Cedex, France
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Abstract

A trioctahedral, ferrous smectite has been located in the uppermost deposits of Atlantis II Deep, SW basin, Red Sea. This clay is very unstable when removed from its environment of formation and, for example, oxidizes during desiccation under laboratory conditions. Only X-ray transmission diffraction study of the mud itself demonstrates the trioctahedral character of the clay. Electron-optical investigation shows that oxidation within the octahedral sheet creates a juxtaposition of dioctahedral and trioctahedral sub-lattices in the same particle. Ferrous smectite authigenesis is located near the hydrothermal spring outlets of the Atlantis II Deep.

Type
Research Article
Information
Clay Minerals , Volume 20 , Issue 3 , September 1985 , pp. 389 - 404
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985

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