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Title: MINERAL COMPOSITIONS OF SOME ROCK-FORMING MINERALS IN THE LOW-GRADE SEDIMENTARY AND MAFIC ROCKS, EASTERN CIRCUM-RHODOPE BELT, BULGARIA
MINERAL COMPOSITIONS OF SOME ROCK-FORMING MINERALS IN THE LOW-GRADE SEDIMENTARY AND MAFIC ROCKS, EASTERN CIRCUM-RHODOPE BELT, BULGARIA

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Nikolay Bonev
10.5593/sgem2024/1.1/s01.14
10.5593/sgem2024/1.1
1314-2704
978-619-7603-67-5
English
24
1.1
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
1.Geology
The eastern Circum-Rhodope belt (CRB) is a major unit that surrounds both the Serbo-Macedonian and the Rhodope zones in the Alpine orogen of the northern Aegean region. This belt contains Triassic-Jurassic metasedimentary successions and Middle Jurassic (176-165 Ma) supra-subduction zone Evros ophiolite. The latter has experienced ocean-floor hydrothermal metamorphism or very-low to low-grade metamorphism. We report on mineral compositions of rock-forming minerals in schist and mafic rocks from the eastern CRB. Our goal is to use the mineral compositions to assess the metamorphic conditions suffered by the rocks. The studied minerals include amphibole, garnet and mica. The electron probe microanalyzer was used to obtain the mineral chemistry recalculated into the mineral structural formula. The amphiboles in the mafic rocks have the compositions from magnesio-hornblende to edenite hornblende, which includes also actinolite-hornblende to actinolite and ferro-tschermakite in the greenschists. In the mica schist, the amphibole is magnesian-hastingsite, which is associated with almandine garnet, muscovite and biotite. The mineral assemblage studied, and its composition, reflects unequivocally greenschist facies metamorphic conditions experienced by the rocks. These conditions are further confirmed by the abundant chlorite and epidote observed in the metasedimentary and metamafic rocks. Thus, our study extends quantitively the metamorphic grade and conditions pertinent to the eastern CRB rocks.
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The support provided by National Science Fund (Bulgaria) (contract no. KP-06-N54/5) is greatly acknowledged.
conference
https://doi.org/10.5593/sgem2024/1.1/s01.14
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Proceedings of 24th International Multidisciplinary Scientific GeoConference SGEM 2024
24th International Multidisciplinary Scientific GeoConference SGEM 2024, 1 - 7 July, 2024
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Russian Acad Arts; Turkish Acad Sci.
99-104
1 - 7 July, 2024
website
9844
mineral chemistry, low-grade metamorphism, eastern Circum-Rhodope belt, Bulgaria

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