A clinopyroxene paragenesis of albite-epidote-amphibolite facies in meta-syenites from the South-East Tauern Window, Austria

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Authors:Droop, G. T. R.
Author Affiliations:Primary:
Dep. Geol. and Mineral., Oxford, United Kingdom
Volume Title:Journal of Petrology
Source:Journal of Petrology, 23(2), p.163-185. Publisher: Clarendon Press, Oxford, United Kingdom. ISSN: 0022-3530
Publication Date:1982
Note:In English. 35 refs.; illus. incl. 4 tables, geol. sketch map
Summary:The mineral textures, mineral compositions and geobarometry indicate that the clinopyroxene, a sodic salite, crystallized as part of an equilibrium albite-epidote-amphibolite facies paragenesis in the 35-40 m.y. meso-Alpine metamorphic event. Salitic clinopyroxene can be a stable phase only if such quartz-albite-K-feldspar-sphene-bearing meta-syenites and meta-granites have low Al/(Na + K) ratios. Thermochemical calculations indicate that the meta-syenites were metamorphosed at T approx 500°C and P 6 +2/-4 kbar. Fluids in equilibrium with meta-syenite and meta-granite mineral assemblages had XH2O values of approx 0.95, assuming XH2O + XCO2 = 1.0. [R.A.H.]
Subjects:Chain silicates; Clinopyroxene; Geologic barometry; Metaigneous rocks; Metamorphic rocks; Metamorphism; Mineral assemblages; P-T conditions; Paragenesis; Petrology; Phase equilibria; Pyroxene group; Silicates; Austria; Central Europe; Europe; Tauern Window; Albite-epidote-amphibolite facies; Meta-syenites; Pennine Complex
Abstract Numbers:82M/4533
Record ID:1987032617
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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