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Timing of pegmatite emplacement and skarn formation in the Malyovitsa Unit, NW Rila: evidence from zonal grossular crystals.

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Title: Timing of pegmatite emplacement and skarn formation in the Malyovitsa Unit, NW Rila: evidence from zonal grossular crystals.
Alternate Title: Възраст на внедряване на пегматити и скарнообразуване в Мальовишката единица, СЗ Рила по данни от зонални гросуларови кристали
Authors: Vassileva, Rossitsa D.1 rosivas@geology.bas.bg, Petrussenko, Svetoslav2 svet_petrussenko@yahoo.com, Grozdev, Valentin1 val.grozdev@gmail.com, Peytcheva, Irena1 irena.peytcheva@erdw.ethz.ch, Plotkina, Yulia3 jplotkina@yandex.ru, von Quadt, Albrecht4 albrecht.vonquadt@erdw.ethz.ch
Source: Review of the Bulgarian Geological Society. 2022, Vol. 83 Issue 3, p121-124. 4p.
Subjects: Skarn, Minerals, Metamorphic rocks, Crystals, Uranium-lead dating, Geological time scales
Abstract: Contact Ca-skarns are formed in the marbles of the Malyovitsa Lithotectonic Unit as a result of emplacement of crosscutting pegmatite injections in the area of the Dzhendemski Ezera, NW Rila Mt. Large (up to 4 cm), well-shaped garnet crystals dominate the mineral association with additional vesuvianite, diopside, scapolite and zoisite. Garnets were selected for mineralogical, geochemical and U-Pb geochronological study. Their crystals show clear zonal pattern due to variation in the octahedral position (Fe3+/Al3+), although the overall composition defines grossular predominance (72-95 mol.% grossular; 4-24% andradite). Trace-element signatures reveal constant isomorphic incorporation of P, V, Zn, Ga, Ge and Y, REE, HFSE, U. Results from the in-situ U-Pb dating of the studied skarn materials suggest the timing of pegmatite intrusion onto the metamorphic rocks and marble-hosted skarn formation at 58.37±0.70 Ma. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Contact Ca-skarns are formed in the marbles of the Malyovitsa Lithotectonic Unit as a result of emplacement of crosscutting pegmatite injections in the area of the Dzhendemski Ezera, NW Rila Mt. Large (up to 4 cm), well-shaped garnet crystals dominate the mineral association with additional vesuvianite, diopside, scapolite and zoisite. Garnets were selected for mineralogical, geochemical and U-Pb geochronological study. Their crystals show clear zonal pattern due to variation in the octahedral position (Fe3+/Al3+), although the overall composition defines grossular predominance (72-95 mol.% grossular; 4-24% andradite). Trace-element signatures reveal constant isomorphic incorporation of P, V, Zn, Ga, Ge and Y, REE, HFSE, U. Results from the in-situ U-Pb dating of the studied skarn materials suggest the timing of pegmatite intrusion onto the metamorphic rocks and marble-hosted skarn formation at 58.37±0.70 Ma. [ABSTRACT FROM AUTHOR]
ISSN:00073938
DOI:10.52215/rev.bgs.2022.83.3.121