Low-temperature constraints on the Alpine thermal evolution of the central parts of the Sredna Gora Zone, Bulgaria

Balkanska, Eleonora; Georgiev, Stoyan; Kounov, Alexandre; Antić, Milorad; Tagami, Takahiro; Sueoka, Shigeru; Wijbrans, J. R.; Peytcheva, Irena

doi:10.31577/geolcarp.73.1.1

Cited by 2 publications

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“…Early Cretaceous discrete low-grade strike-slip and north-vergent shear zones were reported also in the crystalline basement of the Sredna Gora Zone (e.g., Lazarova et al, 2015;Balkanska et al, 2021). The maximum temperature between ~300 °C and 400 °C, attained in the basement of this unit during the Early Cretaceous (140-138 Ma), was attributed to tectonic burial (Balkanska et al, 2022). Therefore, the Sredna Gora Zone could be considered as an upper part of the retro-wedge during the Rhodopean orogeny.…”

Section: Wrench and Retro-wedge Upper Unitsmentioning

confidence: 92%

“…1), from which muscovite and biotite 40 Ar/ 39 Ar plateau ages between 105 Ma and 99 Ma were reported (Velichkova et al, 2004). Recently, Balkanska et al (2022) reported muscovite and biotite 40 Ar/ 39 Ar multiple single-grain fusion analysis constraining the thermal peak of the Early Alpine event at about 140-138 Ma at temperatures between ~300 °C and 400 °C, probably related to active thrusting.…”

Section: Sredna Goramentioning

confidence: 99%

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On the Rhodopean protoliths and their Middle Jurassic to Early Cretaceous evolution. A review

Kounov,

Gerdjikov

2024

GeolBalc

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The Rhodope Massif represents a large high-grade metamorphic complex situated in the Balkan Peninsula, straddling the border between Bulgaria and Greece. Geological studies carried out during the last thirty years clearly established that the complex is composed of three major lithotectonic units characterized by differing protolith ages and Alpine thermotectonic evolution. The Rhodope Massif consists of Upper and Lower terranes representing continental fragments composed mainly of pre-Mesozoic magmatic rocks and covered by Early Mesozoic sedimentary sequences. These two entities are separated by an Intermediate Terrane comprising a Jurassic magmatic arc and its host rocks tectonically intercalated with Jurassic ophiolitic fragments together with the Early Mesozoic sediments. Detailed analyses of the previously published geochronological data revealed that the three main tectonic terranes were juxtaposed in the Late Jurassic–Early Cretaceous during the continental collision and northward subduction of the Lower and Intermediate terranes. These rocks experienced Middle Jurassic to Early Cretaceous high-pressure metamorphism, followed by high-temperature one accompanied by anatexis. At that time, the Upper Terrane was metamorphosed and deformed only partially. Being part of the European margin, this terrane represented an upper continental plate during the subduction, and therefore is not considered as a part of the Alpine Rhodope metamorphic complex. It is important to note that, although most of the present-day fabric and major tectonic zones in the Rhodope metamorphic complex are younger than Early Cretaceous, and therefore they postdate the geological evolution discussed in this study, they often reactivate the old boundaries between the main terranes and units.

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Section: Wrench and Retro-wedge Upper Unitsmentioning

confidence: 92%

Section: Sredna Goramentioning

confidence: 99%

On the Rhodopean protoliths and their Middle Jurassic to Early Cretaceous evolution. A review

Kounov,

Gerdjikov

2024

GeolBalc

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New advances in the understanding of Bulgarian geology through fission-track analysis – a review

Balkanska,

Kounov

2023

GeolBalc

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The paper is focused on the development and application of fission-track analysis in Bulgaria from the first experiments in the 1980s to the present. The results from two different approaches (the conventional method and fission-track analysis using LA-ICP-MS), obtained for deciphering the thermal and tectonic evolution of several zones of the Balkanides, are summarized. They demonstrate the significance of the method and its considerable contribution to the understanding of Bulgarian geology.

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Low-temperature constraints on the Alpine thermal evolution of the central parts of the Sredna Gora Zone, Bulgaria

Cited by 2 publications

References 0 publications

On the Rhodopean protoliths and their Middle Jurassic to Early Cretaceous evolution. A review

On the Rhodopean protoliths and their Middle Jurassic to Early Cretaceous evolution. A review

New advances in the understanding of Bulgarian geology through fission-track analysis – a review

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