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.
Literature
Gottini, V., 1962,The TiO 2 frequency in volcanic rocks. Geol. Rundschau, Vol. 57, p. 930–935.
—————, 1969,Nuovo metodo di calcolo petrochimico per distinguere i magmi anatettici crostali da quelli provenienti dal mantello superiore. Boll. Accad. Gioenia, Catania, Ser. IV, Vol. 9, p. 609–618.
Jung, D., 1958,Untersuchungen am Tholeyit von Tholey (Saar). Beitr. Min. Petr., Vol. 6, p. 147–181.
Kuno, H., 1960,High-alumina basalts. Jour. Petrol., Vol. 1, p. 121–145.
—————, 1968,Differentiation of Basalt Magmas. Basalt, Vol. 2, p. 623–688, Interscience Publ. John Wiley & Sons, London.
Macdonald, G. A., 1957,Dissimilarity of continental and oceanic rock suites. Geol. Soc. Amer. Bull., Vol. 68, p. 1761–1762.
—————, 1967,Dissimilarity of continental and oceanic rock types. Journ. Petrol., Vol. 1, p. 172–177.
————— andKatsura, K., 1964,Chemical composition of Hawaiian lavas. Jour. Petrol., Vol. 5, p. 82–133.
Manson, V., 1967,Chemistry of Basaltic Rocks: Major Elements. Basalts, Vol. 1, p. 215–270, Interscience Publ. John Wiley & Sons, London & New York.
Ono, K., 1962,Chemical composition of volcanic rocks in Japan. Univ. of Publication.
Rittmann, A., 1962,Volcanoes and Their Activity. Interscience Publ., John Wiley & Sons, N. Y., 305 pp.
—————, 1967,Die Bimodalität des Vulkanismus und die Herkunft der Magmen. Geol. Rundsch., Vol. 57, p. 277–295.
—————, 1969,Note to the contribution of V. Gottini on the Serial Character of the Volcanic Rocks of Pantelleria. Bull. Vol., Vol. 33-3, p. 818–827.
Streckeisen, A. L., 1967,Classification and Nomenclature of Igneous Rocks. N. J. Miner. Abh., Vol. 107, p. 144–240.
Additional information
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