Detrital zircon age constraints for Late Permian to Late Triassic clastic sedimentation in the northern-western Sakar-Strandzha Zone, SE Bulgaria

Geochemistry of Triassic metasediments from easternmost part of Sakar Unit, Sakar-Strandzha Zone, SE Bulgaria

“…The Triassic metasedimentary rocks were derived from recycled sediment material with some felsic to intermediate igneous input. The studied rocks differ from metasediments from western outcrops (Vladinova et al, 2016) with higher felsic igneous input and the presence of older recycled sediment material and are similar to geochemical features reported for arkoses and subarcoses from Sakar Unit (Bonev et al, 2022). On tectonic setting discrimination diagrams, based on immobile trace elements, the studied metasediments fall in the fields of continental island arc and active continental margin, in accordance with the geological evolution of the Black Sea region -continuous accretion of northern Gondwana margin to Eurasia from mid-Peleaozoic to Cimmerian (Okay, Nikishin, 2015).…”

“…Preliminarily geochemical data on metasediments from the Western Sakar Unit were reported by Vladinova et al (2016) and revealed a continental island arc setting for the origin of the siliciclastic component. Bonev et al (2022) gave additional data on geochemistry and geochronology mainly on arkoses-subarkoses compositions derived from acid magmatic rocks from continental arc.…”