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The Origin of Pyrophyllite Rectorite in Shales of North Central Utah

Published online by Cambridge University Press:  01 July 2024

G. V. Henderson
G. V. Henderson*
Affiliation:
Department of Earth Sciences, California State Polytechnic College, Pomona, Calif. 91766
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Abstract

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Pyrophyllite is widespread in pelitic rocks of the Manning Canyon Shale in north central Utah, and the association of this mineral with other clay minerals, especially rectorite is related to the origin. The regular mixed-layer clay mineral rectorite seems to form as a result of the alteration of muscovite-paragonite during late stages of diagenesis and represents an intermediate metastable phase in the mineral paragenetic sequence. Pyrophyllite subsequently formed from the alteration of rectorite during advancing metamorphism and is the stable end member of the clay mineral assemblage.

Structural interpretations of rectorite found in the Manning Canyon Shale shows a regular, alternating sequence which consists of a fixed layer of 9.6 Å and an expandable layer, varying from 10 Å to 17 Å. With ethylene glycol saturation in the natural state a basal reflection of 26.60 Å is recorded.

Résumé

Résumé

La pyrophyllite est très répandue dans les roches pélitiques du schiste de Manning Canyon, au centre-nord de l’Utah, et l’association de ce minéral avec d’autres minéraux argileux, en particulier la rectorite, est lié à l’origine. La rectorite régulière interstratifié de minéraux argileux semble se former par suite de la modification de la muscovite-paragonite au cours des derniers stades de la diagénèse et représente une phase métastable intermédiaire dans la séquence paragénétique des minéraux. La pyrophyllite s’est donc formée par suite de la modification de la rectorite au cours du métamorphisme avancé et représente la partie stable en bout de l’assemblage des minéraux argileux.

Les interprétations de structure de la rectorite découverte dans le schiste du Manning Canyon montre une séquence régulière, alternée qui consiste en une couche fixe de 9,6 Å et une couche extensible, variant de 10 Å à 17 Å. Avec la saturation d’éthylène glycol à l’état naturel, une réflexion basale de 26,60 A est enregistrée.

Kurzreferat

Kurzreferat

Pyrophyllit ist weitverbreitet in pelitischem Gestein der Manning Canyon Schiefer im nördlichen Zentral-Utah. une die Verbindung dieses Minerals mit anderen Tonge-steinen, besonders Rectorit, steht in Zusammenhang mit dem Ursprung. Das regulär mischgeschichtete Tongestein Rectorit scheint sich als Ergebnis der Abwechslung von Muskowit-Paragonit während der späteren Phasen der Diagenese zu bilden und stellt eine metastabile Zwischenstufe in der paragenetischen Folge des Gesteins dar. Der Pyrophyllit hat sich in der Folge durch Veränderung von Rectorit während fortschreitendem Metamorphismus gebildet und stellt das stabile Endglied des Tonmineral Zusammenbaus dar.

Die strukturelle Bestimmung des im Manning Canyon Schiefer gefundenen Rectorit zeigt eine reguläre, abwechselnde Folge, die aus einer festen Schicht von 9.6 Å und einer aufblähbaren Schicht, die zwischen 10 Å und 17 Å schwankt. Bei Äthylenglykol-Sättigung im natüralichen Zustand wird eine basale Reflexion von 26.60 Å verzeichnet.

Резюме

Резюме

Пирофиллит широко распространен в пелитовых породах толщи Мэннинг-Каньон Шэйл на севере центральной уасти шт. Юта; ассоциация этого минерала с другими глинистыми минералами, в особенности с ректоритом, зависит от их генезиса. Упорядоченный смешанно-слойный глинистый минерал ректорит, по-видимому, образуется при изменении мусковита-парагонита на поздних стадиях диагенеза и представляет собой промежуточную метастабил-ьную фазу парагенетического ряда минералов. Пирофиллит образуется при изменении ректорита в процессе прогрессивного метаморфизма и является стабильным конечным членом ассоциации глинистых минералов.

Структурные исследования ректорита, обнаруженного в толще Мэннинг-Каньон Шэйл, выявили регулярное чередование слоев двух типов: неразбухающих с d001 9,6А и разбухающих с d001 от 10А до 17А. При насыщении этилен-гликолем ректорит дает базальный рефлеск 26, 60А.

Type
Research Article
Information
Clays and Clay Minerals , Volume 18 , Issue 5 , December 1970 , pp. 239 - 246
Copyright
Copyright © 1970 The Clay Minerals Society

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