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Protolithic age and time of metamorphism of amphibolites from Slasten lithotectonic unit (Southern Pirin Mountains).

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Title: Protolithic age and time of metamorphism of amphibolites from Slasten lithotectonic unit (Southern Pirin Mountains).
Alternate Title: Протолитна възраст и време на метаморфизъм на амфиболитите от Слащенската литотектонска единица (Южен Пирин)
Authors: Macheva, Lyubomirka1 lu_macheva@dir.bg, Machev, Philip2 machev@gea.uni-sofia.bg, Peytcheva, Irena3 ipeytcheva@geology.bas.bg, Plotkina, Julia4 plotkina@yandex.ru, Salnikova, Ekaterina4 katesalnikova@yandex.ru, Stifeeva, Maria4
Source: Review of the Bulgarian Geological Society. 2024, Vol. 85 Issue 2, p183-186. 4p.
Subjects: Sphene, Plagioclase, Amphibolites, Zircon analysis, Uranium-lead dating, Garnet
Abstract: The investigated amphibolites from the Slasten lithotectonic unit are found as a strongly elongated body trending north-south at the eastern slope of the Pirin Mountain, near the village of Ilinden. These rocks are hosted by biotite and biotite-amphibole gneisses, some partially migmatized and containing thin intercalations of marble. The mineral composition is amphibole, plagioclase, epidote, quartz, garnet, pyroxene, titanite, and calcite. P-T conditions of metamorphism are in the range 691-724 °C and 0.74-0.86 GPa. LA-ICP-MS analyses of zircons yield a Middle Triassic (246.4±3.2 Ma) age of formation of these amphibolites. [ABSTRACT FROM AUTHOR]
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Abstract:The investigated amphibolites from the Slasten lithotectonic unit are found as a strongly elongated body trending north-south at the eastern slope of the Pirin Mountain, near the village of Ilinden. These rocks are hosted by biotite and biotite-amphibole gneisses, some partially migmatized and containing thin intercalations of marble. The mineral composition is amphibole, plagioclase, epidote, quartz, garnet, pyroxene, titanite, and calcite. P-T conditions of metamorphism are in the range 691-724 °C and 0.74-0.86 GPa. LA-ICP-MS analyses of zircons yield a Middle Triassic (246.4±3.2 Ma) age of formation of these amphibolites. [ABSTRACT FROM AUTHOR]
ISSN:00073938
DOI:10.52215/rev.bgs.2024.85.2.183