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Two contrasting mineral assemblages in the Meliata blueschists, Western Carpathians, Slovakia

S. W. Faryad and G. Hoinkes
Two contrasting mineral assemblages in the Meliata blueschists, Western Carpathians, Slovakia
Mineralogical Magazine (August 1999) 63 (4): 489-501

Abstract

Low-grade metamorphic rocks from the Meliata unit (Western Carpathians) are characterized by the presence of typical blueschist-facies minerals. In metabasalt, an early low-pressure assemblage (<0.5 GPa at 350 degrees C), characterized by muscovite and zoisite, is followed by high-pressure glaucophane, phengite, Na-pyroxene, chlorite, clinozoisite and Al-poor titanite, indicating pressures of >1.2 GPa at 450 degrees C. Na-pyroxene shows strong compositional variations between the end-members Jd (sub 4-70) , Aeg (sub 10-49) and Q (sub 17-49) , respectively. Phengite has high Si content of 3.5 a.p.f.u. The zoisite with Al (sub 2) Fe(100[Fe (sub tot) /(-2+Al (sub tot) +Fe (sub tot) )]) = 3-5%, is rimmed by clinozoisite, with a maximum of 75% Al (sub 2) Fe, as well as being enclosed by glaucophane. The occurrence of clinozoisite, rimming zoisite, suggests that the transformation of orthorhombic to monoclinic epidote depends not only on the temperature but also on the pressure. In the studied metabasalt, retrograde phases reflecting greenschist-facies conditions are albite and chlorite. Some neighbouring metabasites may additionally contain actinolite and biotite.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 63
Serial Issue: 4
Title: Two contrasting mineral assemblages in the Meliata blueschists, Western Carpathians, Slovakia
Affiliation: University of Graz, Institute of Crystallography, Mineralogy and Petrology, Graz, Austria
Pages: 489-501
Published: 199908
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 25
Accession Number: 1999-067579
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N47°45'00" - N49°40'00", E16°49'00" - E22°30'00"
Secondary Affiliation: Technical University Kosice, SVK, Slovakia
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 199923
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