The Maritsa strike-slip shear zone between Kostenets and Krichim towns, South Bulgaria — Structural, petrographic and isotope geochronology study

Naydenov, Kalin; Peytcheva, Irena; Quadt, Albrecht von; Sarov, Stoyan; Kolcheva, K.; Dimov, Dimo

doi:10.1016/j.tecto.2012.08.005

Cited by 18 publications

(27 citation statements)

References 41 publications

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“…These biostratigraphic constraints agree with the ~90 to 79 Ma age interval for igneous rocks associated with the volcaniclastic basin in the eastern part of the Timok segment [ Kolb , ]. In contrast to the Eastern Srednogorie Basin, the basins in the Panagyurishte and Timok segments are marine pull‐apart basins, which partly formed during dextral shearing along the Iskar‐Yavoritsa shear zone [ N. Georgiev et al , ; Naydenov et al , ]. This dextral shear zone is syntectonic with felsic and mafic plutons emplaced during the 86–75 Ma time interval.…”

Section: Discussionmentioning

confidence: 68%

“…Hence, pluton emplacement partly overlaps with the age span of the volcano‐sedimentary parts of the Panagyurishte and Timok Basins. This suggests opening of the Panagyurishte and Timok Basins in a scenario of crustal‐scale dextral strike‐slip motion, interpreted in terms of dextral transpression by previous authors [ N. Georgiev et al , ; Naydenov et al , ; Georgiev et al , ]. However, a transtensional rather than transpressional setting is indicated for two reasons: (1) the Iskar‐Yavoritsa shear zone is contemporaneous with the opening of comagmatic transtensional basins [ Naydenov et al , ] and (2) the Iskar‐Yavoritsa shear zone is confined to the area of deposition of the Panagyurishte and Timok Basins and has no further continuation to the east.…”

Section: Discussionmentioning

confidence: 68%

“…This suggests opening of the Panagyurishte and Timok Basins in a scenario of crustal‐scale dextral strike‐slip motion, interpreted in terms of dextral transpression by previous authors [ N. Georgiev et al , ; Naydenov et al , ; Georgiev et al , ]. However, a transtensional rather than transpressional setting is indicated for two reasons: (1) the Iskar‐Yavoritsa shear zone is contemporaneous with the opening of comagmatic transtensional basins [ Naydenov et al , ] and (2) the Iskar‐Yavoritsa shear zone is confined to the area of deposition of the Panagyurishte and Timok Basins and has no further continuation to the east. The age of volcaniclastic sediments deposited in sedimentary basins in the Banat region is not well constrained [ Barzoi and Seclaman , ], but magmatic dikes (76–75 Ma) are associated with Santonian‐Campanian sediments (~84–72 Ma).…”

Section: Discussionmentioning

confidence: 99%

“…Although the origin of the Strandzha, Circum‐Rhodope, and the Rhodope Units is somewhat ambiguous, they certainly have been part of the European continental margin since at least Cretaceous times [ Okay et al , ; Schmid et al , ; Burg , ]. The Rhodope Unit is separated from the Dacia Mega‐Unit along the right‐lateral Maritsa fault system that comprises several NW‐SE trending shear zones, among others the Iskar‐Yavoritsa shear zone, which became active in the Late Cretaceous [ N. Georgiev et al , ; Naydenov et al , ].…”

Section: Regional Geologymentioning

confidence: 99%

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Tectonic, magmatic, and metallogenic evolution of the Late Cretaceous arc in the Carpathian‐Balkan orogen

et al. 2015

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The Apuseni-Banat-Timok-Srednogorie Late Cretaceous magmatic arc in the Carpathian-Balkan orogen formed on the European margin during closure of the Neotethys Ocean. It was subsequently deformed into a complex orocline by continental collisions. The Cu-Au mineralized arc consists of geologically distinct segments: the Apuseni, Banat, Timok, Panagyurishte, and Eastern Srednogorie segments. New U-Pb zircon ages and geochemical whole rock data for the Banat and Apuseni segments are combined with previously published data to reconstruct the original arc geometry and better constrain its tectonic evolution. Trace element and isotopic signatures of the arc magmas indicate a subduction-enriched source in all segments and variable contamination by continental crust. The magmatic arc was active for 25 Myr (~92-67 Ma). Across-arc age trends of progressively younger ages toward the inferred paleo-trench indicate gradual steepening of the subducting slab away from the upper plate European margin. This leads to asthenospheric corner flow in the overriding plate, which is recorded by decreasing Nd (0.51234 to 0.51264) ratios over time in some segments. The close spatial relationship between arc magmatism, large-scale shear zones, and related strike-slip sedimentary basins in the Timok and Pangyurishte segments indicates mild transtension in these central segments of the restored arc. In contrast, the Eastern Srednogorie segment underwent strong orthogonal intraarc extension. Segmental distribution of tectonic stress may account for the concentration of rich porphyry Cu deposits in the transtensional segments, where lower crustal magma storage and fractionation favored the evolution of volatile-rich magmas.

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Section: Discussionmentioning

confidence: 68%

Section: Discussionmentioning

confidence: 68%

Section: Discussionmentioning

confidence: 99%

Section: Regional Geologymentioning

confidence: 99%

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Tectonic, magmatic, and metallogenic evolution of the Late Cretaceous arc in the Carpathian‐Balkan orogen

et al. 2015

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“…Judging from the ∼115 to ∼70 Ma "geochronological gap" on the regional scale, renewed underthrusting of the SU rocks is unlikely to have started before 70 Ma. From ∼90 to ∼78 Ma, syn-kinematic plutons associated with the Srednogorie magmatic arc were emplaced along the Maritsa Shear Zone, a major NW-SE strike-slip shear zone forming the northern boundary of the RMC (e.g., Georgiev et al, 2009;Naydenov et al, 2013;Gallhofer et al, 2015). At the northwestern tip of the RMC, top-to-SE oblique thrusting within higher levels of the metamorphic pile has recently been dated at ∼76 Ma (Gorinova et al, 2015).…”

Section: Polycyclic Orogeny and Two-loop P-t-t Path Of The Sidironeromentioning

confidence: 99%

Polycyclic alpine orogeny in the Rhodope metamorphic complex: the record in migmatites from the Nestos shear zone (N. Greece)

Gautier

Bosse

Cherneva

et al. 2017

Bull. Soc. géol. Fr.

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-The Rhodope Metamorphic Complex (RMC) is a high-grade crystalline massif located at the northern margin of the Aegean region. Numerous scenarios have been proposed for the evolution of the RMC during Alpine times. A debated issue is whether there has been a single protracted orogenic cycle since around the mid-Mesozoic or whether Alpine orogeny involved distinct episodes of subduction and crustal accretion. We describe a key outcrop located on the Nestos Shear Zone (NSZ), a major NNE-dipping top-to-SW shear zone characterized by an inverted metamorphic sequence. Structural and petrological data document the existence of two anatectic events. The first event, best preserved in decametric structural lenses, is pre-kinematic with respect to top-to-SW shearing and involved high-temperature "dry" melting. Zircon and monazite LA-ICPMS U-Th-Pb data indicate that this event occurred at ∼140 Ma. The second event is syn-kinematic with respect to top-to-SW shearing and involved lower-temperature water-assisted melting. Zircon and rutile LA-ICPMS U-Pb data indicate that this second event occurred at ∼40 Ma. During ongoing top-to-SW shearing and as late as ∼36 Ma, the rocks from the outcrop were at higher temperatures than the peak temperatures experienced by lower levels of the NSZ. This confirms the existence of the inverted metamorphic sequence and demonstrates that the NSZ was a major thrust at 36-40 Ma. The ∼100 Myr time laps between the two anatectic events encompasses the period from ∼115 to ∼70 Ma characterized by a gap in the geochronological record on the scale of the RMC (the Eastern Rhodope excluded). This ∼45 Myr gap likely reflects a period of tectonic quiescence between the mid-Mesozoic orogen and the Cenozoic one, attesting for polycyclic Alpine orogeny in the RMC. Unlike assumed in several geodynamic scenarios, the Alpine evolution of the RMC did not consist of a single orogenic cycle of Mesozoic age followed by Cenozoic crustal-scale extension triggered by mantle delamination. Polycyclic orogeny has resulted in a two-loop P-T-t path for the hangingwall unit of the NSZ. The Cenozoic P-T paths of this unit and the footwall unit merged while both units were being exhumed, a feature attributed to synthrusting extensional spreading of the main mass of the hangingwall unit above the NSZ.Keywords: Aegean / syn-deformation migmatization / U-Pb dating / LA-ICPMS / inverted metamorphism / synmetamorphic thrusting Résumé -Orogenèse alpine polycyclique dans le complexe métamorphique du Rhodope : enregistrement dans les migmatites de la zone de cisaillement du Nestos (Grèce). Le Rhodope est un complexe métamorphique de haut grade situé à la frange Nord de la région égéenne. De nombreux scénarios ont été proposés pour son évolution durant la période alpine. Une question débattue est de déterminer s'il n'y a eu qu'un seul cycle orogénique de longue durée depuis le milieu du Mésozoïque ou bien si l'orogenèse alpine a impliqué des épisodes distincts de subduction-accrétion crustale. Nous décrivons un affleurement-...

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Late Cretaceous eclogite in the Eastern Rhodopes (Bulgaria): evidence for subduction under the Sredna Gora magmatic arc

Miladinova

Froitzheim

Nagel

et al. 2018

Int J Earth Sci (Geol Rundsch)

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The Maritsa strike-slip shear zone between Kostenets and Krichim towns, South Bulgaria — Structural, petrographic and isotope geochronology study

Cited by 18 publications

References 41 publications

Tectonic, magmatic, and metallogenic evolution of the Late Cretaceous arc in the Carpathian‐Balkan orogen

Tectonic, magmatic, and metallogenic evolution of the Late Cretaceous arc in the Carpathian‐Balkan orogen

Polycyclic alpine orogeny in the Rhodope metamorphic complex: the record in migmatites from the Nestos shear zone (N. Greece)

Late Cretaceous eclogite in the Eastern Rhodopes (Bulgaria): evidence for subduction under the Sredna Gora magmatic arc

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