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Stabilitätsbeziehungen von Prehnit- und Pumpellyit-haltigen Paragenesen

Stability relations of parageneses containing prelmite and pumpellyite

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Abstract

This investigation was undertaken to find the typical conditions for the formation of low-grade metamorphic rocks in which prehnite and/or pumpellyite (± actinolite, chlorite, epidote, and quartz) occur as characteristic minerals. In the p, t diagram the slope of the equilibrium curve prehnite + chlorite + H2O=pumpellyite + actinolite + quartz is negative; the slope of the equilibrium curve pumpellyite + chlorite + quartz=epidote + actinolite + H2O is positive. The point of intersection of the two equilibrium curves is an invariant point. The relative positions of the six equilibrium curves surrounding the invariant point were found by applying Schreinemakers's analysis.

Experimental results show that the paragenesis prehnite-pumpellyite-chlorite-quartz is stable at 2 kb up to 345±20 °C, and at 7 Kb up to 260±20 °C. The paragenesis actinolitechlorite-pumpellyite-quartz occurs only at pressures greater than 2.5±1 kb. It is stable at 7 kb in the strongly pressure-dependent temperature range 260±20 °C to 370±20 °C. The paragenesis actinolite-chlorite-epidote-quartz, typical of the greenschist facies, may occur at pressures of 2–3 kb at temperatures of at least 350±20 °C. This temperature limit is only slightly changed with increasing pressure.

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Authors and Affiliations

  1. Mineralogisch-Petrologisches Institut der Universität Göttingen, Deutschland

    Karl -Heinz Nitsch

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  1. Karl -Heinz Nitsch
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Herrn Prof. Dr. H. G. F. Winkler möchte ich an dieser Stelle für die kritische Durchsicht des Manuskriptes sowie manche wertvolle Diskussion danken. Ebenso gilt mein Dank Herrn Dr. B. Storre und Herrn Doz. Dr. P. Metz für anregende Diskussionen. Herr Dr. P. Süße besorgte die Übersetzung des Abstracts.

Außerdem sei den Angestellten der Mineralogischen Anstalten und des Mineralogisch-Petrologischen Instituts gedankt, die zu dieser Arbeit einen Beitrag geleistet haben. Die Deutsche Forschungsgemeinschaft förderte durch apparative Unterstützung wesentlich den experimentellen Teil der vorliegenden Publikation.

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Nitsch, K.H. Stabilitätsbeziehungen von Prehnit- und Pumpellyit-haltigen Paragenesen. Contr. Mineral. and Petrol. 30, 240–260 (1971). https://doi.org/10.1007/BF00455673

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  • DOI: https://doi.org/10.1007/BF00455673

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