Tzvetomila Vladinova

• Phd student of Geochemistry
• Bulgarian Academy of Sciences

The varied rocks of the former Parvenets complex (Ivanov et al., 1984) were attributed to different units with a regional extent: the Central Rhodope metamorphic terrain (Ichev, Pristavova, 2004), Thracian lithotectonic unit as part of the Thracian terrain (Sarov, 2012), and Srednogorie Zone (Naydenov et al., 2008). These rocks are affected by the...

The Sredogriv greenschist facies rocks belong to the Western Balkan Zone in northwestern Bulgaria. The low-grade rocks consist of clastic-tuffaceous precursors and presumably olistostromic magmatic bodies. We present U-Pb LA-ICP-MS zircon age constraints for the Sredogriv metaconglomerate, intruding metaalbitophyre and a breccia-conglomerate of the...

The Sredogriv greenschist facies rocks belong to the Western Balkan Zone in northwestern Bulgaria. The low-grade rocks consist of clastic-tuffaceous precursors and presumably olistostromic magmatic bodies. We present U-Pb LA-ICP-MS zircon age constraints for the Sredogriv metaconglomerate, intruding metaalbitophyre and a breccia-conglomerate of the...

The petrological and geochemical data for the Sredogriv metamorphics determine protoliths of metaconglomerates and metasandstones with varying clay content and a significant amount of acidic igneous fragments. The geochemistry, geochronology, and mineralogy of these lithic clasts coincide with the exposed in the close vicinity allochthonous Neoprot...

The mica-bearing schist of the Thracian lithotectonic unit basement represents a granite protolith overprinted by high-grade metamorphism. The zircon population displays Silurian protolith age with inherited older Neo- to Paleoprotezoic cores affected by a Carboniferous metamorphism. The Late Cretaceous–Paleogene metamorphic rutile could have resul...

U-Pb detrital zircon geochronology provides middle Permian–earliest Triassic (272–246 Ma) maximum depositional ages for the Zelenigrad and Vranska Formations of the Belogradchik Unit. These ages match the depositional span (305–249 Ma) of the sedimentary successions in the St. Iliya Heights of the Sakar-Strandzha Zone, in addition to their structur...

The Sredogriv low-grade metamorphic rocks belongs to the Montana Unit of the Western Balkan Zone in Northwestern Bulgaria. The low-grade rocks predominantly consist of metamorphosed in greenschist facies clastic and clastic-marly precursors and minor basic to acidic extrusive and intrusive presumably olistostromic rock bodies. Here, we present detr...

We present new data on the geochemistry of rutiles from metamorphic rock of the Asenitsa and Arda Units, Central Rhodope Massif, Bulgaria. Trace elements in studied rutiles show large variations that depend on protolith type (metapelites and metabasites), metamorphic grade, the rock geochemistry and mineral association. Zr-in-rutile thermometry dis...

The geochemistry of Triassic metacarbonate rocks from the Sakar unit, Sakar-Strandzha zone recorded condition on deposition environments and primary (protoliths) composition. The metacarbonate yielded trace element distribution that conform seawater condition on shallow shelves under oxic conditions and coincide interpretation of Chatalov (1990). T...

Triassic metasediments from the easternmost part of Sakar Unit, Sakar-Strandzha Zone, SE Bulgaria, show a high variety in their mineral and chemical composition from shales, wakes, litharenites to arkoses. Geochemical signatures suggest low to moderate weathering degree at their source and upper continental crust composition. The Triassic metasedim...

Metasedimentary sequence from the westernmost Sakar Unit (Klokotnitsa Village area), Sakar–Strandja Zone, comprises a variety of lithologies with Triassic protolith age. In the study area, the Sakar Unit is affected by low-grade metamorphism in the frame of the Maritsa dextral strike-slip shear zone and separates two first-order units of the Bal...

The P-T evolution of carbonate-bearing metasedimentary rocks from the Sakar unit (Sakar-Strandzha Zone, SE Bulgaria) has been obtained using Perple_X modelling and conventional geothermometry. The metamorphic conditions vary from greenschist facies (250–350 °C/2–4 kbar) in the Klokotnitsa village area to amphibolite facies (550–650 °C/4.5–6.5 kbar)...

The metamorphic basement of the Sakar unit, Sakar-Strandzha zone (Ivanov, 2017) consists of metagranites, paragneisses, amphibolites, mica gneisses and schists, unconformably overlained by fossil-bearing Sakar type Triassic metasediments (Chatalov, 1990) with revealed late Permian maximum depositional age of 259 Ma (Bonev et al. 2019a). Previously,...

The Sakar-Strandzha zone (Ivanov, 2017) is a Mesozoic orogenic belt composed of Variscan basement, Triassic–Jurassic metasedimentary cover and Upper Cretaceous volcano-sedimentary sequences. The metasedimentary succession (impure marbles, calcite-biotite schists, metabreccia-conglomerate, garnet-staurolite micascishts) affected by amphibolite facie...

Garnet–clinopyroxene–K-feldspar granulite occurs as a thick layer or boudin within the variegated rocks of the Chepelare shear zone in the Central Rhodope massif, Bulgaria. It consists of several domains: mesocratic homogeneous matrix (clinopyroxene–plagioclase–K-feldspar–quartz ± amphibole), porphyroblastic garnet, K-feldspar and clinopyroxene, an...

Early Cadomian metagranitoids in the metamorphic basement of the Sakar-Strandzha Zone, Bulgaria

The investigated pre-Triassic basement and Triassic metasedimentary rocks are part of the Sakar Unit in the Sakar-Strandzha zone (Ivanov, 2017). The basement is considered Volcanic-Terrigenous Complex (VTC; Gerdjikov, 2005), while the covering metasedimentary succession is assigned to the Topolovgrad Group (Sakar Type Triassic, STT) (Chatalov, 1990...

The metasedimentary succession in the area of Klokotnitsa village (Thracian lithotectonic unit, Sarov, 2012) is considered part of the Triassic terrigenous-carbonate association of the Sakar type (Zagorchev, Budurov, 2009). The outcrops are dominated by carbonate and silicate-carbonate rocks. Scarce layers of quartz-mica schists, derived from arena...

The studied metasediments from the area of the village of Klokotnitsa (SE Bulgaria) belong to the Thracian lithotectonic unit, which comprises a variety of protoliths affected by the Maritsa dextral strike-slip shear zone (Sarov, 2012). Initially assigned to the Triassic (Čatalov, 1961), these carbonate-silicate rocks were not studied in detail lat...