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Origin of rhyolites by anatectic melting of granitic crustal rocks

The example of rhyolitic pumice from the island of kos (agean sea)

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Abstract

Rhyolitic pumice deposits on some East Aegean Islands are the remnants of a tuff sheet which covered formerly more than 2500 km2. The rhyolites originated by melting of granitic crustal rocks.

The petrological properties leading to this conclusion are as follows:

  • -mineralogical composition of the pumice being 60 wt % of glass and 40 % of relictic granitic minerals (quartz, plagioclase, potash feldspar, biotite) in «phenocrysts» up to 1 cm Ø.

  • -phenomena of strong corrosion, resorption and melting of all light colored «phenocrysts» in the rhyolitic pumice.

  • -mineralogical and chemical identity between pumice and granitic xenolites found in great quantity in the pumice tuff.

  • -structurally transitional types between pumice and the granites in different state of melting.

  • -eutectic composition of the pumice glass for a pressure of 2 kb.

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References

  • Davis, E. N., 1967,Zur Geologie und Petrologie der Inseln Jali und Nisyros (Dodecanes). Praktika Akad. Athens, Vol. 42, pp. 235–252.

    Google Scholar 

  • Desio, A., 1931,Le isole italiane dell’Egeo. Mem. Descritt. Carta Geol. d’Italia, Vol. 24, pp. 5–534.

    Google Scholar 

  • Gorshkov, G. S., 1965,On the relations of volcanism and the Upper mantle. Bull. Volc., Vol. 28, pp. 159–167.

    Google Scholar 

  • Hentschel, H., 1963,Die Bildung der Bimssteintuffe und das Problem der Ignimbrite. Bull. Volc. 25, pp. 291–313.

    Google Scholar 

  • v. Platen, H., 1965,Kristallisation granitischer Schmelzen. Beitr. Min. u. Petr., Vol. 11, pp. 334–381.

    Article  Google Scholar 

  • Rittmann, A., 1958,Le cause della corrosione magmatica. Boll. dell’Accad. Gioenia di Sc. nat. in Catania, Ser. IV, Vol. 4, pp. 534–541.

    Google Scholar 

  • Steiner, A., 1963,Crystallisation behaviour and origin of the acidic ignimbrite and rhyolite magma in the North Island of New Zealand. Bull. Volc. Vol. 25, pp. 217–241.

    Google Scholar 

  • Tuttle, O. F. & Bowen, N. L., 1958,Origin of granite in the light of experimental studies in the system NaAlSi 3 O 8 -KAlSi 3O8 -SiO 2 -H 2 O. Geol. Soc. Amer. Memoir 74, 153 pp.

  • Winker, H. G. F., 1967,Die Genese der metamorphen Gesteine. Springer Verlag Berlin-Heidelberg-New York, 2. ed. 237 pp.

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  1. Mineralogisches Institut der Universität, D-78, Freiburg, W-Germany

    J. Keller

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  1. J. Keller
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Keller, J. Origin of rhyolites by anatectic melting of granitic crustal rocks. Bull Volcanol 33, 942–959 (1969). https://doi.org/10.1007/BF02596758

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  • DOI: https://doi.org/10.1007/BF02596758

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