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Permian-Triassic A-type rhyolites from the Central Balkanides (Stara Planina Mountains), Bulgaria.

Authors :
Georgiev, Stoyan
Lazarova, Anna
Balkanska, Eleonora
Source :
Review of the Bulgarian Geological Society; 2022, Vol. 83 Issue 3, p77-80, 4p
Publication Year :
2022

Abstract

The rhyolites from the Central Balkan and Sinite Kamani areas are formed in a close time span from 254.6 to 250.7 Ma, while those next to the village of Vlado Trichkov are a little bit earlier (260.3±1.0 Ma). Both age groups follow the voluminous late Carboniferous to early Permian igneous activity that ceased around 290 Ma. The geochemical characteristics of the Vlado Trichkov dacite are comparable to those from the earlier magmatic event. On the other hand, the rocks from the Central Balkan and Sinite Kamani areas show trends of A-type granitoids. The origin of this magmatic products could be attributed to a crustal melting by mantle-derived melts, penetrating or underplating the crust in a post-orogenic setting during the initial extension and rifting, preceding the opening of the Vardar-Meliata Ocean. [ABSTRACT FROM AUTHOR]

Subjects

Subjects :
DACITE
AGE groups
MELTING

Details

Language :
English
ISSN :
00073938
Volume :
83
Issue :
3
Database :
Complementary Index
Journal :
Review of the Bulgarian Geological Society
Publication Type :
Academic Journal
Accession number :
161222600
Full Text :
https://doi.org/10.52215/rev.bgs.2022.83.3.77