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Ferripyrophyllite and related Fe3+-rich 2:1 clays in Recent deposits of Atlantis II Deep, Red Sea

Published online by Cambridge University Press:  09 July 2018

D. Badaut
Affiliation:
Lab. de Géochimie des Roches Sédimentaires, URA 723 du CNRS, Bât. 504, Université de Paris-Sud, 91405 Orsay Cédex
A. Decarreau
Affiliation:
Lab. Pétrologie de la Surface, URA 721 du CNRS, Université de Poitiers, 40 Av. du Recteur Pineau, 86022 Poitiers Cédex
G. Besson
Affiliation:
Lab. de Cristallographie, URA 810 du CNRS, Université d'Orléans, rue de Chartres, BP 6057, 45067 Orleans Cédex 2, France

Abstract

Iron-rich dioctahedral 2:1 clays were sampled in metalliferous sediments from Atlantis II Deep (Red Sea), and studied by XRD, TEM, FTIR and Mössbauer spectroscopy. One sample with the structural formula (Si3·94Fe3+0·06)(Fe3+1·90Mg0·10)K0·1(Mg, Ca)0·03 is closer to the theoretical end-member ferripyrophyllite Si4Fe3+2O10(OH)2 than any other Fe-rich clay previously described. Other samples appear as mixed-layered clays: ferripyrophyllite-hydroferripyrophyllite or hydroferripyrophyllite-celadonite.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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