Abstract
Petrographic, chemical and mineralogical data are presented on the Oetztal eclogites and their co-existing minerals. The available evidence indicates that they constitute the metamorphic derivates of an original gabbroic rock, the plagioclase and clinopyroxene of which reacted to form the garnet, omphacite and kyanite components of the eclogites. According to the available subsolidus experimental data these reactions are believed to have taken place in a 6–10 kb pressure range at about 550°–750° C.
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Bell, P. M., Davis, B. T. C.: Melting relations in the system jadeite — diopside at 30 and 40 kbars. Am. J. Sci. 267-A 17–32 (1969).
Birch, F., LeComte, P.: Temperature-pressure plane for albite composition. Am. J. Sci. 258, 209–217 (1960).
Church, W. R.: Eclogites. In: H. H. Hess and A. Poldervaart (eds.), Basalts: The Poldervaart treatise on rocks of basaltic composition, p. 755–798, New York: John Wiley & Sons 1968.
Coleman, R. G., Lee, D. E., Beatty, L. B., Brannock, W. W.: Eclogites and eclogites: their differences and similarities. Bull. Geol. Soc. Am. 76, 483–508 (1965).
Essene, E. J., Fyfe, W. S.: Omphacite in Californian metamorphic rocks. Contr. Mineral. and Petrol. 15, 1–23 (1967).
Fry, N., Fyfe, W. S.: Eclogites and water pressure. Contr. Mineral. and Petrol. 24, 1–6 (1969).
Fyfe, W. S.: Stability of Al2SiO5 polymorphs. Chem. Geol. 2, 67–76 (1967).
Green, D. H., Ringwood, A. E.: An experimental investigation of the gabbro-to-eclogite transformation and its petrological applications. Geochim. Cosmochim. Acta 31, 767–833 (1967).
Green, T. H.: An experimental investigation of subsolidus assemblages formed at high pressure in high-alumina basalt, kyanite eclogite and grosspydite compositions. Contr. Mineral. and Petrol. 16, 84–114 (1967).
Hezner, L.: Ein Beitrag zur Kenntnis der Amphibolite und Eklogite. Tschermak's Miner. u. Petrogr. Mitt. 22, 437–471, 505–580 (1903).
Hoernes, S., Hoffer, E.: Der Amphibolitzug des mittleren Oetztales. Mitt. Ges. Geol. Bergbaustud. (in press).
Kushiro, I.: Clinopyroxene solid solutions at high pressures. Carnegie Inst. Wash. Yearbook 64, 112–117 (1965).
Lovering, J. F., White, A. J. R.: Granulitic and eclogitic inclusions from basic pipes at Delegate, Australia. Contr. Mineral. and Petrol. 21, 9–52 (1969).
Newton, R. C., Kennedy, G. C.: Some equilibrium reactions in the join CaAl2Si2O8-H2O. J. Geophys. Res. 68, 2967–2983 (1963).
—, Smith, J. V.: Investigations concerning the breakdown of albite at depth in the earth. J. Geol. 75, 268–286 (1967).
Purtscheller, F.: Petrographische Untersuchungen an Alumosilikatgneisen des OetztalerStubaier Altkristallins. Tschermak's Miner, u. Petrogr. Mitt. 13, 35–54 (1969).
Ringwood, A. E., Green, D. H.: An experimental investigation of the gabbro-eclogite transformation and some geophysical implications. Tectonophysics 3, 383–427 (1966).
Robertson, E. C., Birch, F., MacDonald, G. J. F.: Experimental investigation of jadeite stability relations to 25000 bars. Am. J. Sci. 255, 115–137 (1957).
Saxena, S. K.: Silicate solid solutions and geothermometry. 4. Statistical study of chemical data on garnets and clinopyroxene. Contr. Mineral. and Petrol. 23, 140–156 (1969).
White, A. J. R.: Clinopyroxenes from eclogites and basic granulites. Am. Mineralogist 49, 883–888 (1964).
Yoder, H. S., Tilley, C. E.: Origin of basalt magmas: an experimental study of natural and synthetic rock systems. J. Petrology 3, 342–532 (1962).
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Miller, C. Petrology of some eclogites and metagabbros of the Oetztal Alps, Tirol, Austria. Contr. Mineral. and Petrol. 28, 42–56 (1970). https://doi.org/10.1007/BF00389226
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DOI: https://doi.org/10.1007/BF00389226
