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Clay mineral formation at the continent-ocean boundary: the verdine facies

Published online by Cambridge University Press:  09 July 2018

G. S. Odin
G. S. Odin*
Affiliation:
Laboratoire de Géochronologie et Sédimentologie Océanique-Unité associée au CNRS “Géotectonique et Stratigraphie”, Université P. et M. Curie, Tour 26, 4ème étage, 4 Place Jussieu, F75252, Paris Cédex, France
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Abstract

The verdine facies, previously confused with components of ancient ironstones, has been studied in relation to its distribution, mineralogy, genesis, environment, and geological significance. Several chemically specific components are present including (i) a ferric and magnesian dioctahedral-trioctahedral 1 : 1 clay mineral, (ii) a chemically equivalent chlorite, (iii) a component intermediate between smectite and swelling chlorite, and (iv) a problematic low-temperature pyrophyllite-like clay mineral. The genetic mechanism is a series of crystallogenetic reactions using cations from the previous phase; this model, where a mineral phase is shown to be a temporary state of arrangement of cations, suggests that authigenic “marine” minerals may reflect diagenetic geochemical factors different from those in the original sea.

Resume

Resume

Le faciès verdine, préalablement confondu avec certains composés argileux des minerais de fer oolitiques anciens a été étudié aux plans: distribution actuelle, formation, environnement et signification géologique. Divers composés chimiquement spécifiques tout à fait originaux, ont éé partiellement caractérisés, en particulier: (i) un minéral argileux à 7 Å ferrique et magnésien également di- et trioctaédrique, (ii) une chlorite de caractéristiques apparemment similaires, (iii) un composé intermédiaire entre une smectite et une chlorite gonflante, enfin, (iv) plus problématique, une sorte de pyrophyllite de surface. Un modèle de genèse de ces composés implique une série de reactions cristallogénétiques depuis un composé métastable marin jusqu’à des composés plus stables recristallisés en cours de diagenèse. Ces réactions reprennent les ions rassemblés dans le phase préliminaire. Ainsi, les minéraux observés peuvent refléter des caractères géochimiques fort différents de ceux du milieu marin originel.

Type
Research Article
Information
Clay Minerals , Volume 25 , Issue 4 , December 1990 , pp. 477 - 483
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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