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Crustal anatexis and melt extraction during deformation in the restitic xenoliths at El Joyazo (SE Spain)

Published online by Cambridge University Press:  05 July 2018

B. Cesare ,
E. Salvioli Mariani  and
G. Venturelli
B. Cesare
Affiliation:
Dipartimento di Mineralogia e Petrologia, Università di Padova, Corso Garibaldi 37, 1-35137 Padova, Italy
E. Salvioli Mariani
Affiliation:
Istituto di Petrografia, Università di Parma, Viale delle Scienze 78, 1-43100 Parma, Italy
G. Venturelli
Affiliation:
Istituto di Petrografia, Università di Parma, Viale delle Scienze 78, 1-43100 Parma, Italy
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Abstract

The dacite of El Joyazo contains abundant metapelitic xenoliths. These can be divided into two main types: garnet-biotite-sillimanite and spinel-cordierite xenoliths. In the xenoliths the widespread occurrence of rhyolitic glass as interstitial films, foliation-parallel layers and primary melt inclusions in all mineral phases indicates that these assemblages developed in the presence of a melt phase, i.e. during anatexis. The composition of the interstitial glass is comparable to that of the melt inclusions, suggesting that melt was locally produced. Phase equilibria indicate that anatexis occurred at P-T conditions of 5–7 kbar and 850±50°C.

Several microstructural lines of evidence show that melt extraction was assisted by deformation during foliation development, and that on the scale of the xenoliths (up to 50 cm) melt escaped mainly by flow along foliation planes. The development of a syn-anatectic foliation also suggests that metapelitic rocks were involved in high-grade metamorphism and partial melting prior to fragmentation and dispersion in the host dacite.

Mass balance calculations, based on the chemical composition of interstitial glass and melt inclusions in minerals, the bulk xenoliths and representative samples of potential pelitic sources support a model wherein the xenoliths represent restites after the extraction of 30 to 55 wt.% melt from graphitic metapelite protoliths similar to the rocks constituting the surrounding Alpujarride metamorphic complex.

Keywords

anatexisdeformationglassmetapelitemicrostructuresSpainxenoliths
Type
Petrology
Information
Mineralogical Magazine , Volume 61 , Issue 404 , February 1997 , pp. 15 - 27
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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References

Aranovich, L.Ya. and Podlesskii, K.K. (1983) The cordierite-garnet-sillimanite-quartz equilibrium: experiments and applications. In Kinetics and Equilibrium in Mineral Reactions (Saxena, S.K., ed.) Springer, pp. 173-98.CrossRefGoogle Scholar
Bellon, H., Bordet, P. and Montenat, C. (1983) Chronologie du magmatisme Nèogéne des Cordilléres Bètiques (Espagne Mèridionale). Bull. Soc. GéoL France, 25, 205-17.CrossRefGoogle Scholar
De Larouzière, F.D., Bolze, J., Bordet, P., Hernandez, J., Montenat, C. and Ott d'Estevou, P. (1988) The Betic segment of the lithospheric Trans-Alboran shear zone during the late Miocene. Tectonophysics, 152, 41–52.CrossRefGoogle Scholar
Di Battistini, G., Toscani, L., Iaccarino, S. and Villa, I.M. (1987) K/Ar age and the geological setting of calc-alkaline volcanic rocks from Sierra de Gata, SE Spain. Neues Jahrb. Mineral. Mh., 369-83.Google Scholar
Ferry, J.M. and Spear, F.S. (1978) Experimental calibration of the partitioning of Fe and Mg between biotite and garnet. Contrib. Mineral Petrol., 66, 113-7.CrossRefGoogle Scholar
Grant, J.A. and Frost, B.R. (1990) Contact metamorphism and partial melting of pelitic rocks in the aureole of the Laramie Anorthosite Complex, Morton Pass, Wyoming. Amer. J. Sci., 290, 425-72.CrossRefGoogle Scholar
Hayob, J.L., Essene, E.J., Ruiz, J., Ortega-Gutierrez, F. and Aranda-Gomez, J.J. (1989) Young high-temperature granulites from the base of the crust in central Mexico. Nature, 342, 265-8.CrossRefGoogle Scholar
Holtz, F. and Johannes, W. (1991) Genesis of peraluminous granites. I. Experimental investigation of melt compositions at 3 and 5 kb and various H2O activities. J. Petrol., 32, 935-58.CrossRefGoogle Scholar
Johnston, A.D. and Wyllie, P.J. (1988) Constraints on the origin of Archaean trondhjemites based on phase relationships of Nûk gneiss with H2O at 15 kbar. Contrib. Mineral. Petrol., 100, 35–46.CrossRefGoogle Scholar
Lopez-Ruiz, J. and Rodriguez-Badiola, E. (1980) La region volcanica Neogena del sureste de Espana. Estudios Geologicos, 36, 5–63.Google Scholar
Munskgaard, N.C. (1984) High δ18O and possible preeruptional Rb-Sr isochrons in cordierite-bearing Neogene volcanics from SE Spain. Contrib. Mineral. Petrol., 87, 351-8.CrossRefGoogle Scholar
Munskgaard, N.C. (1985) A non-magmatic origin for compositionally zoned euhedral garnet in silicic Neogene volcanics from SE Spain. Neues Jahrb. Mineral. Mh., 73–82.Google Scholar
Newton, R.C. and Haselton, H.T. (1981) Thermodynamics of garnet-plagioclase-Al2SiO5 quartz geobarometer. In Thermodynamics of Minerals and Melts (Newton, R.C., Navrotsky, A. and Wood, B.J., eds.) Springer, pp. 131-47.CrossRefGoogle Scholar
Nobel, F.A., Andriessen, P.A.M., Hebeda, E.H., Priem, H.N.A. and Rondeel, H.E. (1981) Isotopic dating of the post-Alpine Neogene volcanics in the Betic Cordilleras, Southern Spain. Geol. Mijnbouw, 60, 209-14.Google Scholar
Patiño Douce, A. and Johnston, D.A. (1991) Phase equilibria and melt productivity in the pelitic system: implications for the origin of peraluminous granitoids. Contrib. Mineral. Petrol., 107, 202-18.CrossRefGoogle Scholar
Roedder, E. (1984) Fluid inclusions. In Reviews in Mineralogy, 12, 646pp.Google Scholar
Salvioli Mariani, E., Cesare, B. and Venturelli, G. (1995) Petrology of metapelite-derived xenoliths in the Hoyazo dacite (SE Spain). Terra Abstracts, 7, 317.Google Scholar
Srogi, L., Wagner, M.A. and Lutz, T.M. (1993) Dehydration partial melting and disequilibrium in the granulite-facies Wilmington Complex, Pennsylvania-Delaware Piedmont. Amer. J. Sci., 293, 405-62.CrossRefGoogle Scholar
Toscani, L., Venturelli, G., Barbieri, M., Capedri, S., Fernandez-Soler, J.M. and Oddone, M. (1990) Geochemistry and petrogenesis of two-pyroxene andesites from Sierra de Gata (SE Spain). Mineral. Petrol., 41, 199–213.CrossRefGoogle Scholar
Vielzeuf, D. and Holloway, J.R. (1988) Experimental determination of the fluid-absent melting reactions in the pelitic systems, Consequences for crustal differentiation. Contrib. Mineral. Petrol., 98, 257-76.CrossRefGoogle Scholar
Vielzeuf, D. and Montel, J.M. (1994) Partial melting of metagreywackes. Part 1. Fluid-absent experiments and phase relationships. Contrib. Mineral. Petrol., 117, 375-93.CrossRefGoogle Scholar
Zeck, H.P. (1968) Anatectic origin and further petrogenesis of almandine-bearing biotite-cordierite-labradorite dacite with many inclusions of restite and basaltoid material, Cerro de Hoyazo, SE Spain. PhD Thesis, Amsterdam, 161 pp.Google Scholar
Zeck, H.P. (1970) An erupted migmatite from Cerro de Hoyazo, SE Spain. Contrib. Mineral. Petrol., 26, 225-46.CrossRefGoogle Scholar

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