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Rare earth elements in different size fractions of a marine quick clay from Ullensaker, and a till from Upper Numedal, Norway

Published online by Cambridge University Press:  09 July 2018

Elen Roaldset
Elen Roaldset*
Affiliation:
Department of Geology, University of Oslo, Postbox 1047, Blindern, Oslo 3, Norway
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Abstract

The distribution of rare earth elements (REE) in two different sediments, a marine clay and a till, was found to be dependent both on grain size and mineralogical composition. In the marine clay the REE content was highest in the coarsest fraction; in the till REE were markedly enriched in the finest fraction. Detrital and authigenic origins for different size fractions have been attributed on the basis of REE contents.

Résumé

Résumé

La répartition des terres rares dans deux sédiments différents, une argile marine et une argile glaciaire, s'est avérée dépendre à la fois de la granulométrie et de la composition minéralogique. Dans l'argile marine la teneur en terres rares est plus élevée dans la fraction des grains les plus gros; dans l'argile glaciaire les fractions les plus fines sont nettement enrichies en terres rares. On a pu préciser les origines détritique ou locale pour les fractions de diverses granulométries en se fondant sur les teneurs en terres rares.

Kurzreferat

Kurzreferat

Es wurde festgesellt, daß die Verteilung von seltenen Seltenen-Erden-Elementen (REE) in zwei verschiedenen Sedimenten, einem marinen Ton und einem Till, sowohl von der Korngröße als auch von der mineralischen Zusammensetzung abhängig ist. In den marinen Tonen war der REE-Gehalt in den gröbsten Fraktionen am höchsten. Im Till wurden die Seltenen-Erden in der feinsten Fraktion bemerkenswert angereichert. Detritische und authigene Herkunft für verschiedene Korngrößenfraktionen wurden als Grund für die REE-Gehalte angesehen.

Resumen

Resumen

La distribución de elementos de tierras raras en dos sedimentos distintos, una arcilla marina y una arcilla glaciar, se ha hallado que depende de la granulometría y de la composición mineralógica. En la arcilla marina el contenido de elementos de tierras raras era el más alto en la fracción más gruesa; en la arcilla glaciar los elementos de tierras raras estaban marcadamente enriquecidos en la fracción más fina. Se han atribuído orígenes detríticos y autígenos para fracciones de diferentes tamaños sobre la base de los contenidos de elementos de tierras raras.

Type
Hommage à Jean Chaussidon
Information
Clay Minerals , Volume 14 , Issue 3 , September 1979 , pp. 229 - 240
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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