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Classification and nomenclature of volcanic rocks, lamprophyres, carbonatites and melilitic rocks IUGS Subcommission on the Systematics of Igneous Rocks

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Zusammenfassung

Die IUGS Subcommission on the Systematics of Igneous Rocks legt Empfehlungen vor für Klassifikation und Nomenklatur der Vulkanite, Lamprophyre, Karbonatite und Melilith-Gesteine. Vulkanite sollen — unter Verwendung des QAPF Doppeldreiecks — nach dem modalen Mineralbestand klassifiziert werden, sofern sich dieser genau genug bestimmen oder abschätzen läßt; andernfalls muß die chemische Zusammensetzung herangezogen werden. Weitere Empfehlungen beziehen sich auf „Phäno-Typen“, glasführende und glasige Gesteine, die sog. „paläo-vulkanischen“ Gesteine sowie auf Definitionen einiger Gesteinsnamen.

Abstract

The IUGS Subcommission on the Systematics of Igneous Rocks presents recommendation for the classification and nomenclature of volcanic rocks, lamprophyres, carbonatites and melilitic rocks. It is recommended to classify volcanic rocks according to mineral contents and by using the QAPF double triangle, provided that the modal mineral composition can be determined or estimated with sufficient approximation. Further recommendations refer to “pheno-types“, glass-bearing and glassy rocks, “paleo-volcanic“ rocks and the definitions of several rock terms.

Résumé

La IUGS Subcommission on the Systematics of Igneous Rocks présente des recommandations pour la classification et nomenclature des roches volcaniques, lamprophyres, carbonatites et roches mélilitiques. Il est recommandé de classifier les roches volcaniques selon leur composition minéralogique et en utilisant le double triangle QAPF, pourvu que la composition modale puisse être déterminée avec une approximation suffisante; sinon, la composition chimique doit être prise en considération. Des recommandations supplémentaires concernent les « phéno-types », les roches vitreuses, les roches dites « paléo-volcaniques » et la définition de certains termes.

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References

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Streckeisen, A. Classification and nomenclature of volcanic rocks, lamprophyres, carbonatites and melilitic rocks IUGS Subcommission on the Systematics of Igneous Rocks. Geol Rundsch 69, 194–207 (1980). https://doi.org/10.1007/BF01869032

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