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Possible structure of halloysite disks and cylinders observed in some New Zealand rhyolitic tephras

Published online by Cambridge University Press:  09 July 2018

J. H. Kirkman
J. H. Kirkman*
Affiliation:
Soil Science Department, Massey University, Pabnerston North, New Zealand
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Abstract

The < 1·0 µm fractions of three rhyolitic tephras are shown to contain multifaceted squat cylinders of halloysite at various stages of development. The < 1·0 µm fraction of one of the tephras, the Pahoia Tuff, is composed mainly of large well-ordered squat cylinders, together with amorphous silica flakes, and novel disk-shaped particles of halloysite. The disks always occur sandwiched between silica flakes. A spiral structure is proposed for the disks. The squat cylinders are interpreted as having formed by a similar spiral mechanism to that of the disks, but without the constraining influence of silica flakes.

Résumé

Résumé

La fraction < 1·0 µm de trois tèphres rhyolitiques montre qu'ils contiennent des cylindres applatis d'halloysite à divers stades de développement. La fraction < 1·0 µm d'un des tèphres, le Pahoia Tuff, est composée principalement de grands cylindres applatis bien ordonnés, avec des lames de silice amorphe et de particules originales d'halloysite en forme de disques. Les disques se présentent toujours intercalés entre les lames de silice. Une structure en spirale est suggérée pour les disques. Les cylindres applatis sont interprétés comme ayant été formés par un mécanisme en spirale similaire à celui des disques, mais sans l'influence contraignante des lames de silice.

Kurzreferat

Kurzreferat

Die < 1·0 µm Bruchstücke von drei rhyolitischen Tephras enthalten nachweislich mehrfach facettierte Erznestzylinder aus Halloysit in verschiedenen Entwicklungsstufen. Das < 1·0 µm Bruchstück eines der Tephras, der Pahoia Tuff, setzt sich hauptsächlich aus grossen, gut geordneten Erznestzylindern mit amorphen Silikaflocken und neuartigen, scheibenförmigen Partikeln aus Halloysit zusammen. Die Scheiben treten stets zwischen Silikaflocken geschichtet auf. Für die Scheiben wird ein Spiralgefüge vorgeschlagen. Bei den Erznestzylindern wird angenommen, dass sie sich durch einen ähnlichen Spiralmechanismus wie bei den Scheiben gebildet haben, jedoch ohne den beschränkenden Einfluss von Silikaflocken.

Resumen

Resumen

Se demuestra que las fracciones < 1·0 µm de tres tefras rioliticas contienen cilindros multifacetados achatados de halloysita en diversas etapas de desarrollo. La fracción de < 1·0 µm de una de las tefras, la Toba volcánica Pahoia, está compuesta principalmente de grandes cilindros achatados bien dispuestos, junto con escamas de silice amorfo, y partículas discoides de halloysita de nueva formación. Los discos siempre aparecen emparedados entre escamas de silice. Se sugiere una estructura espiral para los discos. Se interpretan los cilindros achatados como producto de un mecanismo espiral similar al de los discos, aunque sin la influencia constrictiva de las escamas de silice.

Type
Research Article
Information
Clay Minerals , Volume 12 , Issue 3 , September 1977 , pp. 199 - 216
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1977

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