Structural and geochronological constraints on the magmatic and tectonic events in the pre-Alpine basement of the central parts of the Balkan fold–thrust belt (Central Stara Planina Mountains, Bulgaria)

Balkanska, Eleonora; Gerdjikov, Ianko; Georgiev, Stoyan; Lazarova, Anna; Dörr, Wolfgang; Kounov, Alexandre

doi:10.1007/s00531-021-02011-1

Cited by 12 publications

(10 citation statements)

References 44 publications

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“…These authors also highlight that the Variscan Orogen in Bulgaria and the surrounding areas does not include an older phase of c. 340 Ma to 325 Ma magmatism, which was confirmed by recent work (e.g. Balkanska et al 2021). This implies a similar evolution of the Balkanides and the western part of the Variscan Orogeny exposed in the Iberian Massif, where c. 340 Ma to c. 325 Ma felsic intrusions are also absent (Dias et al 1998;Fernández-Suárez et al 2000).…”

Section: B Geochronological and Geochemical Arguments For Two-stage Magmatism In The Strandja Zonesupporting

confidence: 75%

“…Okay et al 2001). The exact age of Variscan metamorphism in the Strandja Zone remains unknown, but it is well established from the Balkanides (c. 340 -330 Ma; Carrigan et al 2006;Antić et al 2016;Balkanska et al 2021). The second scenario assumes that subduction of the Palaeo-Tethys Ocean beneath Laurussia played a primary role, resulting in various intrusions of volcanic-arc granites (VAG) in the Strandja Zone (Okay et al 2001;Natal'in et al 2016;Peytcheva et al 2016;Aysal et al 2018;Bonev et al 2019a).…”

Section: B Geochronological and Geochemical Arguments For Two-stage Magmatism In The Strandja Zonementioning

confidence: 99%

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Two stages of Late Carboniferous to Triassic magmatism in the Strandja Zone of Bulgaria and Turkey

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Although Variscan terranes have been documented from the Balkans to the Caucasus, the southeastern portion of the Variscan Belt is not well understood. The Strandja Zone along the border between Bulgaria and Turkey encompasses one such terrane linking the Balkanides and the Pontides. However, the evolution of this terrane, and the Late Carboniferous to Triassic granitoids within it, is poorly resolved. Here we present laser ablation – inductively coupled plasma – mass spectrometry (LA-ICP-MS) U–Pb zircon ages, coupled with petrography and geochemistry from the Izvorovo Pluton within the Sakar Unit (Strandja Zone). This pluton is composed of variably metamorphosed and deformed granites which yield crystallization ages of c. 251–256 Ma. These ages are older than the previously assumed age of the Izvorovo Pluton based on a postulated genetic relationship between the Izvorovo Pluton and Late Jurassic to Early Cretaceous metamorphism. A better understanding of units across the Strandja Zone can now be achieved, revealing two age groups of plutons within it. An extensive magmatic episode occurred c. 312–295 Ma, and a longer-lived episode between c. 275 and 230 Ma. Intrusions associated with both magmatic events were emplaced into pre-Late Carboniferous basement, and were overprinted by Early Alpine metamorphism and deformation. These two stages of magmatism can likely be attributed to changes in tectonic setting in the Strandja Zone. Such a change in tectonic setting is likely related to the collision between Gondwana-derived terranes and Laurussia, followed by either subduction of the Palaeo-Tethys Ocean beneath Laurussia or rifting in the southern margin of Laurussia, with granitoids forming in different tectonic environments.

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Section: B Geochronological and Geochemical Arguments For Two-stage Magmatism In The Strandja Zonesupporting

confidence: 75%

Section: B Geochronological and Geochemical Arguments For Two-stage Magmatism In The Strandja Zonementioning

confidence: 99%

Two stages of Late Carboniferous to Triassic magmatism in the Strandja Zone of Bulgaria and Turkey

et al. 2021

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“…Similar to the Shivachevo complex, the Ribaritsa unit consists almost entirely of deformed in medium-to high-grade greenschist facies granitoids, which preliminary 206 Pb/ 238 U age data point to late Carboniferous (313.1±4.6 Ma) magma emplacement and crystallization (Antonov et al, 2010). Analogous greenschist deformation accommodated the slightly younger (307.8±3.9 Ma) Ambaritsa sheet-like pluton, constituting a considerable part of the Botev Vrah thrust, as it was related to a transpressional tectonics, revealed in the later stage of the Variscan evolution (Balkanska et al, 2021). Furthermore, the greenschist facies Shivachevo complex undoubtedly is a part of the basement of the Stara Planina Zone, since such low-grade metagranitoid units were not recognized in the Sredna Gora Zone basement.…”

Section: Results and Regional Implicationmentioning

confidence: 96%

Pre-Mesozoic basement of Tvarditsa Stara Planina Mountain, Central South Bulgaria: U-Pb geochronology and regional implication

Dörr¹,

Lazarova²,

Gerdjikov³

2021

Rev. Bulg. Geol. Soc.

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The easternmost coherent tract of the pre-Mesozoic basement of the Carpatho-Balkanide belt is exposed in Tvarditsa Stara Planina Mountain. Two metamorphic units – the Lazovo and Shivachevo complexes as well as the Tvarditsa pluton were distinguished, as their ages are still not well constrained. Here, we present U-Pb (ID-TIMS) data for the Shivachevo complex and the Tvarditsa pluton, putting this information in the regional context of the late Variscan geodynamic evolution of the region.

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“…251.5±1.3 Ma (Georgiev et al, 2013) intruded the lower Paleozoic lowgrade metasedimentary sequence in Central Stara Panina Mountain in the autochthone of the Paleogene Botev Vrah thrust. In the same area is exposed the 250.1±1 Ma old (Balkanska et al, 2021) Kalofer granitoid -part of the Hisarya-Pastrovo pluton. The preliminary data about the subvolcanic and volcanic bodies, exposed next to the town of Sliven is ca.…”

Section: Regional Contextmentioning

confidence: 99%

Klisura/Rozino granite, Central Sredna Gora: a part of the story of late Permian–Early Triassic extensional magmatic event

Lazarova¹,

Broska²,

Svojtka³

et al. 2021

Rev. Bulg. Geol. Soc.

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Тhe late- to post-Variscan magmatic activity in the South Black See region took plaсe during a considerably long period of ca. 80 from Late Carboniferous up to Early–Mid Triassic as two episodes are distinguished. The obtained age of 253.6±1.6 Ma for the Klisura/Rozino granite gives further evidence of the contemporaneous intrusive and extrusive magmatism during late Permian and Early Triassic in the Sredna Gora and Balkan zones.

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Structural and geochronological constraints on the magmatic and tectonic events in the pre-Alpine basement of the central parts of the Balkan fold–thrust belt (Central Stara Planina Mountains, Bulgaria)

Cited by 12 publications

References 44 publications

Two stages of Late Carboniferous to Triassic magmatism in the Strandja Zone of Bulgaria and Turkey

Two stages of Late Carboniferous to Triassic magmatism in the Strandja Zone of Bulgaria and Turkey

Pre-Mesozoic basement of Tvarditsa Stara Planina Mountain, Central South Bulgaria: U-Pb geochronology and regional implication

Klisura/Rozino granite, Central Sredna Gora: a part of the story of late Permian–Early Triassic extensional magmatic event

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