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The probable origin of high-alumina basalts

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Résumé

A l’aide d’un nouveau diagramme pétrochimique, proposé par V.Gottini, on démontre que les « high-alumina basalts » n’ont rien à faire avec les autres types basaltiques. Ils sont intimement liés aux andésites des régions orogéniques, n’étant en réalité que des méla-andésites. Il semble très probable que les « high-alumnia basalts » et les andésites proprement dites dérivent d’une anatexie des parties inférieures de la croûte terrestre sialique. On propose une nomenclature de ces roches qui reflète la bimodalité du volcanisme, supposée, d’être causée par la différence qui existe entre la composition de la croûte terrestre et celle du manteau supérieur.

Abstract

By the aid of a new petrochemical diagram, introduced by V.Gottini, it is shown that the high-alumina basalts have no relation to other basalt types. That they are intimately linked to true andesites in orogenic regions and are better said to be mela-andesites. Their probable origin is discussed with the conclusion that the high-alumina basaltic and andesitic magmas are due to anatexis of the lower parts of the sialic earth crust. A systematics is proposed which reflects the bimodality of vulcanism supposed to be due to the contrast between upper mantle and crustal material.

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Paper read at the symposium « Volcanoes and their Roots », Oxford, England, Sept. 1969.

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Rittmann, A. The probable origin of high-alumina basalts. Bull Volcanol 34, 414–420 (1970). https://doi.org/10.1007/BF02596765

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  • DOI: https://doi.org/10.1007/BF02596765

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