Abstract
The intermediate lavas of the Azores Archipelago are reinvestigated and compared with other lavas from oceanic islands. Using both published and new petrological data, it appears that the so-called andesites and latites are in fact hawaiites and tristanites.
Similar content being viewed by others
Bibliographie
Baker, P.E., Gass, I. G., Harris, P. G., Le Maître, R. W.: The Volcanological report of the royal society expedition to Tristan da Cunha. Phil. Trans. Roy. Soc. London, Ser. A 256, 439–578 (1964).
Berthois, L.: Contribution à l'étude lithologique de l'archipel des Açores. Commun. Serv. Geol. Portugal 34, 1–195 (1953).
Carmichael, I. S. E.: The Petrology of Thingmuli, a tertiary volcano in Eastern Iceland. J. Petrol. 5, 435–460 (1964).
Coats, R.: Basaltic andesites. In: Basalts (edit. Poldervaart and Hess), vol. 2, p. 689–736. New York: Interscience 1968.
Chayes, F.: A petrographic distinction between cenozoïc voloanics in and around the open oceans. J. Geophys. Res. 69, 1573–1588 (1964).
Chayes, F.: The chemical composition of cenozoïc andesite. Proceedings of the Andesite Conference, Intern. upper mantle project, Sci. Rept. 16, 1–11 (1969).
Chayes, F.: The so-called andesites of the Oceanic Islands. Carnegie Inst. Wash., Geophys. Lab. year book 68, 175–177 (1970).
Chayes, F.: On the amounts of silica and normative quartz in analyses of andesite, dacite and rhyodacite. Carnegie Inst. Wash., Geophys. Lab. year book 68, 177–178 (1970).
Dickinson, W. R., Rickard, M. J., Smith, J. G., Lawrence, R. L.: Late caenozoic shoshonitic lavas in North-western Viti, Fiji. Nature (G.B.) 219, 148–149 (1968).
Esenwein, P.: Zur Petrographie der Azores. Z. Vulkan. 12, 108–227 (1929).
Gill, J. B.: Geochemistry of Viti Levu, Fiji, and its evolution as an island arc. Contr. Mineral. and Petrol. 27, 179–203 (1970).
Jakes, P., Gill, J.: Rare earth elements and the island arc tholeiitic series. Earth Planet. Sci. Lett. 9, 17–28 (1970).
Jakes, P., White, A.J.R.: Structure of the melanesian arc and correlation with distribution of magma types. Tectonophysics 8, 223–236 (1970).
Jérémine, E.: Etude microscopique des roches de la région de Furnas (S. Miguel, Açores). Commun. Serv. Geol. Port. 1, 65–90 (1957).
Johannsen, A.: A descriptive petrography of the igneous rocks: 3. The intermediate rocks, p. 100–101. Chicago: Chicago Univ. Press 1937.
Joplin, G. A.: The shoshonite association: a review. J. Geol. Austr. 15, 275–294 (1968).
Krause, D. C.: East West Azores fracture-zones in North Atlantic. In: Submarine Geology and geophysics (edit. Whittard and Bradshaw, p. 163–172. London: Butterworth 1965.
Kuno, H.: Differentiation of basalt magmas. In: Basalts (edit. Poldervaart and Hess), vol. 2, p. 623–688. New York: Interscience 1968.
Kuno, H.: Andesite in time and space. Proceedings of the Andesite Conference, Intern. upper mantle project. Sci. Rept. 16, 13–20 (1969).
Lemaître, R. W.: Petrology of volcanic rocks, Gough Island, South Atlantic. Bull. Geol. Soc. Am. 73, 1309–1340 (1962).
MacBirney, A. R., Gass, I. G.: Relations to oceanic volcanic rocks to mid-oceanic rises and heat flow. Earth Planet. Sci. Lett. 2, 265–276 (1967).
MacBirney, A., Williams, H.: Geology and Petrology of the Galapagos Islands. Geol. Soc. Am. Mem. 118, 1–197 (1969).
MacDonald, G.: Dissimilarity of Continental and Oceanic Rock types. J. Petrol. 1, 172–177 (1960).
MacDonald, G., Katsura, T.: Chemical composition of Hawaiian lavas. J. Petrol. 5, 82–133 (1964).
Mügge, O.: Petrographische Untersuchungen und Gesteine von den Azoren. Neues Jahrb. Mineral. 2, 189–232 (1883).
Muir, I. D., Tilley, C. E.: Mugearites and their place in alkali igneous rock series. J. Geol. 69, 186–203 (1961).
Nicholls, J., Carmichael, I. S. E.: A commentary on the absarokite-shoshonite-bakanite series of Wyoming, U.S.A. Schweiz. Mineral. Petrog. Mitt. 49, 47–64 (1969).
Taylor, S. R.: Geochemistry of andesites. In: Origin and distribution of the elements (edit. L. H. Ahrens), p. 559–583. Oxford: Pergamon Press 1968.
Tilley, C. E., Muir, I. D.: Intermediate members of the Oceanic basalt-trachyte association. Geol. För. Stockh. Förhandl. 85, 434–443 (1964).
Torre de Assunção, C. F.: Contribução para a petrografia dos produtos emitidos pelo vulcao dos Capelinhos (Faial). Serv. Geol. Port., Memoria 4, 57–64 (1959).
Torre de Assunção, C. F.: Estudo petrografico da Ilha de S. Miguel (Açores). Commun. Serv. Geol. Port. 45, 81–143 (1961).
Uchimizu, M.: Geology and petrology of alkali rocks from Dogo, Oki islands. J. Fac. Sci. Tokyo 16, 85–159 (1966).
Zbyszewski, G.: Carta geologica de Portugal, Serviçes geologicos de Portugal, Noticia explicativa (1959–1968).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Girod, M., Lefevre, C. A propos des ≪andésites≫ des Açores. Contr. Mineral. and Petrol. 35, 159–167 (1972). https://doi.org/10.1007/BF00370926
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00370926