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A Geo-Sciences Journal of the Geological Institute “Strashimir Dimitrov”, Bulgarian Academy of Sciences
Official Journal of the Carpathian-Balkan Geological Association

Mineralogical and geochemical characteristics of the Sedemte Prestola potassic alkaline pluton

Pages: 
pp. 57-69
Momchil Dyulgerov
Department of Mineralogy, Petrology and Economic Geology, Faculty of Geology and Geography, Sofia University “St Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria
Tanya Stoylkova
Department of Mineralogy, Petrology and Economic Geology, Faculty of Geology and Geography, Sofia University “St Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria
Abstract: 

The Sedemte Prestola pluton is an intermediate to acid plutonic body of Variscan age (308.7 ± 9.1 Ma). Despite its small size, several petrographic varieties are present: syenites, quartzsyentes and granites. It is composed of potassium feldspar, quartz, sodic-calcic amphibole; biotite, when present, is often rimmed by amphibole or strongly altered; zircon, titanite, apatite and ilmenite are the accessory phases. The rocks display pronounced potassic character with up to 10.4 wt% K2O, peralkaline tendency, and significant trace element enrichment for REE, Zr, Th, U, and Ba. The rocks also show enriched isotopic characteristic with 87/86Sri between 0.7107 and 0.7111, and 143/144Ndi between 0.51193 and 0.51182. The geochemical features of the Sedemte Prestola pluton imply orogenic geodynamic setting of formation as a product of more primitive magma fractionation. Isotopic characteristics and high LILE, Th and U contents support the derivation from enriched mantle source – phlogopite-bearing peridotites in the spinel stability field.

Keywords: 

potassic granitoid, Variscan, trace elements enrichment

DOI: 
10.52321/GeolBalc.51.3.57
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VOLUME 51 (3)/December 2022

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Ruslan Kostov
University of Mining and Geology “St Ivan Rilski”, Boyan Kamenov Str., 1700 Sofia, Bulgaria
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Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
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Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
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Department of Mineralogy, Petrology and Economic Geology, Faculty of Geology and Geography, Sofia University “St Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria
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Tanya Stoylkova
Department of Mineralogy, Petrology and Economic Geology, Faculty of Geology and Geography, Sofia University “St Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria

Mineralogical and geochemical characteristics of the Sedemte Prestola potassic alkaline pluton

Ilonka Koleva
Department of University Archive, Sofia University “St Kliment Ohridski, 15 Tsar Osvoboditel Blvd, 1000 Sofia, Bulgaria

The archive of Professor Georgi Zlatarski – knowledge source of the foundation of geology and paleontology in Bulgaria

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In memoriam: Professor Milko Manolov Kanazirski, DSc (May 28, 1936 – August 04, 2022)

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