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Mössbauer study of glauconites from Poland

Published online by Cambridge University Press:  09 July 2018

A. Kotlicki ,
J. Szczyrba  and
A. Wiewióra
A. Kotlicki
Affiliation:
Institute of Experimental Physics, Warsaw University, 00-681 Warsaw
J. Szczyrba
Affiliation:
Institute of Geological Sciences, Polish Academy of Sciences, 02-089 Warsaw, Poland
A. Wiewióra
Affiliation:
Institute of Geological Sciences, Polish Academy of Sciences, 02-089 Warsaw, Poland
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Abstract

Four bands occur in the Mössbauer spectra of pelletal glauconites ranging in age from Cambrian to Oligocene. Components due to Fe3+ in the cis M(2) positions are visible in all the spectra but their shapes depend on the expanding layer content. In the spectrum of the Oligocene glauconite a very well-developed shoulder due to Fe2+ in the trans M(1) positions is observed. In the younger glauconites (15–20% expanding layers) the conventional assignments of the spectra indicate that Fe2+ occupies the trans M(1) positions, the cis M(2) positions being vacant. Conversely, in the Palaeozoic samples (~5% expanding layers) the cis occupancy significantly prevails over trans occupancy.

Résumé

Résumé

Dans les spectres Mössbauer de glauconite sous forme de paillettes, dont l'âge varie du cambrien à l'oligocène, apparaissent 4 bandes. Les composantes dues au Fe3+, en position cis M(2) sont visibles dans tous les spectres, mais leur forme dépend du contenu du feuillet glonflant. Dans les spectres des glauconites de l'oligocène on observe un épaulement très bien développé dû au Fe2+ en position trans M(1). Dans les glauconites plus jeunes (15 à 20% de feuillets gonflants) le Fe2+ occupe des positions trans M(1) alors que les positions cis M(2) sont vacantes. Au contraire, dans les échantillons du paléozoïque (env. 5% de feuillets gonflants) l'occupation des cis est plus forte que l'occupation des trans.

Kurzreferat

Kurzreferat

In Mössbauerspektren von Glaukonitkörnern aus der Zeitspanne von Kambrium bis Oligozän erscheinen vier Banden. Zu Fe3+ in cis M(2) Positionen gehörige Komponenten sind in allen Spektren sichtbar, aber ihre Ausprägung hängt vom Gehalt quellfähiger Schichten ab. Im Spektrum des oligozänen Glaukonits ist eine besonders gut ausgebildete Schulter für Fe2+ die trans M(1) Positionen zu beobachten. Bei den jüngeren Glaukoniten (15-20 quellfähige Schichten) zeigen die für derartige Spektren üblichen Auswertungskriterien, daβ Fe2+ die trans M(1) Positionen besetzt und die cis M(2) Positionen leer sind. In paläzoischen Proben dagegen (~5% quellfähige Schichten) füberwiegt die cis-Besetzung signifikant eine trans-Besetzung.

Resumen

Resumen

En los espectros Mössbauer de glauconitas con edades comprendidas entre los períodos Cámbrico y Oligoceno, aparecen cuatro bandas debidas al Fe+3 en posición cis M(2) cuya forma depende del contenido en material hinchable. En el espectro de una gluconita procedente del Oligoceno aparece un hombro bien desarrollado asignado a Fe+2 en posición trans M(1). En las glauconitas más jóvenes (15-20% de material hinchable) los asignamientos convencionales del espectro indican que el Fe+2 ocupa la posición trans M(1), quedando vacantes las posiciones cis M(2). Inversamente, en las muestras procedentes del Paleozoico (~5% de material hinchable) la ocupación de la posición cis prevalece significativamente frente a la de la posición trans.

Type
Research Article
Information
Clay Minerals , Volume 16 , Issue 3 , September 1981 , pp. 221 - 230
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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