Phase petrology and P-T conditions of mafic blueschists from the Meliata unit, West Carpathians, Slovakia

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Authors:Faryad, S. W.
Author Affiliations:Primary:
Technical University, Department of Geology and Mineralogy, Kosice, Slovakia
Volume Title:Journal of Metamorphic Geology
Source:Journal of Metamorphic Geology, 13(6), p.701-714. Publisher: Blackwell, Oxford, United Kingdom. ISSN: 0263-4929
Publication Date:1995
Note:In English. 36 refs.; illus., incl. 4 tables, geol. sketch maps
Summary:These rocks occur along a tectonic line between the inner and central W Carpathians. Mineral assemblages and compositions from seven localities and one occurrence of amphibolite-facies rocks overprinted by blueschist metamorphism were investigated. The most common minerals were blue amphibole, epidote and albite; some Fe2+- and Al-rich rocks also contained garnet and chloritoid, respectively. Na-pyroxene with a maximum 50% jadeite component was also found. The blue amphiboles correspond mostly with crossite and also with glaucophane and ferroglaucophane in some samples. Almandine- and spessartine-rich garnet has >><[dollar]I> 3 wt.% MgO; the Si content in phengite is 3.3-3.5 pfu calculated on the basis of 11 oxygens. The zoning patterns of blue amphibole, garnet and chloritoid suggest their formation during a prograde stage of metamorphism during which conditions are estimated to have been ∼ 380-460°C and 10-13 kbar. Values of 350-370°C and 7.5-8.5 kbar were obtained for some actinolite- and aegirine-rich rocks. Apart from chlorite, other mafic minerals formed during retrograde metamorphism are biotite and occasionally also actinolite. [R.E.S.]
Subjects:Amphibolite facies; Blueschist; Chemical composition; Facies; Genesis; Mafic composition; Meliata Unit; Metamorphic rocks; Metamorphism; Mineral assemblages; P-T conditions; Phase equilibria; Prograde metamorphism; Schists; Zoning; Carpathians; Central Europe; Europe; Slovakia; Western Carpathians
Abstract Numbers:96M/3776
Record ID:1995068915
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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