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Low Temperature Hydrothermal Synthesis from Dolomite or Calcite, Quartz and Kaolinite

Published online by Cambridge University Press:  01 July 2024

P. Bayliss  and
A. A. Levinson
P. Bayliss
Affiliation:
Department of Geology, The University of Calgary, Alberta, Canada
A. A. Levinson
Affiliation:
Department of Geology, The University of Calgary, Alberta, Canada
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Abstract

Dolomite or calcite, quartz and kaolinite in various proportions were reacted at 250–300°C temperatures and pressures up to 90 bars in a hydrous environment. Reactions which approached completion produced talc, calcite, montmorillonite, anorthite (both metastable hexagonal and stable triclinic polymorphs) and the rare Ca-zeolite, garronite. These reactions are applicable to diagenesis, low-grade metamorphism and hydrothermal alteration.

Résumé

Résumé

De la dolomite ou de la calcite, du quartz et de la kaolinite en différentes proportions, ont été amenés à réagir en milieu aqueux, à des températures comprises entre 250 et 300°C et à des pressions atteignant 90 bars. Les réactions qui ont été presque complètes ont produit du talc, de la calcite, de la montmorillonite, de l’anorthite (à la fois les polymorphes hexagonal métastable et triclinique stable) et une zéolite–Ca rare, la garronite. Ces réactions sont applicables à la diagenèse, au métamorphisme peu poussé et à l’altération hydrothermale.

Kurzreferat

Kurzreferat

Dolomit oder Calcit, Quarz und Kaolinit in verschiedenen Proportionen wurden bei Temperaturen von 250 bis 300°C und Drucken von bis zu 90 bars in wässrigem Medium zur Reaktion gebracht. Annähernd vollständige unter den Reaktionen ergaben Talk, Calcit, Montmorillonit, Anorthit (sowohl metastabil hexagonale und stabil triklinische Polymorphe) und den seltenen Ca-Zeolith Garronit. Diese Reaktionen gelten für Diagenese, niedrige Metamorphose und Hydrothermische Veränderung.

Резюме

Резюме

Доломит или кальцит, кварц, каолинит в различных соотношениях подвергались обработке нагреванием от 250 до 300°С и действию давления до 90 бар в водной среде. Продуктами завершенных реакций оказывались тальк, кальцит, монтмориллонит, анортит (как в виде метастабильной гексагональной, так и в виде стабильной триклинной модификации) и реже Са-цеолит (гарронит). Подобные реакции применимы к интерпретации процессов диагенеза, метаморфизма низкой ступени и гидротермального изменения.

Information

Type
Research Article
Information
Clays and Clay Minerals , Volume 19 , Issue 2 , June 1971 , pp. 109 - 114
Copyright
Copyright © 1971, The Clay Minerals Society

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