Late Alpine (Palaeogene) superimposed depressions in parts of Southeast Bulgaria

Boyanov, Ivan; Goranov, Aleksander

doi:10.52321/geolbalc.31.3-4.3

Cited by 29 publications

(3 citation statements)

References 2 publications

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“…The allochthonous structure and inferred north-vergent thrusting is suggested through the general tectonic framework of the Balkanic orogen [8,14], or alternatively they are interpreted as southward-emplaced thrust sheet during the formation of Rhodope nappes [9]. Both crystalline basement and low-grade rocks are unconformably overlain by Up-per Eocene to Miocene sediments [6] and intruded by Oligocene granitoids [10].…”

Section: Geological Settingmentioning

confidence: 99%

New structural and petrologic data on Mesozoic schists in the Rhodope (Bulgaria): geodynamic implications

Bonev

Stampfli

2003

Comptes Rendus. Géoscience

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Structural analysis of low-grade rocks highlights the allochthonous character of Mesozoic schists in southeastern Rhodope, Bulgaria. The deformation can be related to the Late Jurassic-Early Cretaceous thrusting and Tertiary detachment faulting. Petrologic and geochemical data show a volcanic arc origin of the greenschists and basaltic rocks. These results are interpreted as representing an island arc-accretionary complex related to the southward subduction of the Meliata-Maliac Ocean under the supra-subduction back-arc Vardar ocean/island arc system. This arc-trench system collided with the Rhodope in Late Jurassic times.

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Section: Geological Settingmentioning

confidence: 99%

New structural and petrologic data on Mesozoic schists in the Rhodope (Bulgaria): geodynamic implications

Bonev

Stampfli

2003

Comptes Rendus. Géoscience

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“…East of the Rhodope Complex there are low‐grade metamorphic rocks ascribed to the Circum‐Rhodope Complex (Figure 1a, e.g., Bonev & Stampfli, 2003; Kauffmann et al., 1976). Eocene‐Oligocene sedimentary rocks of the Thrace Basin lie unconformably over these low‐grade metamorphic rocks in Greece, Bulgaria, and Turkey (e.g., Boyanov & Goranov, 2001; Kopp, 1965; Okay et al., 2010).…”

Section: Geological Setting Of the Thrace Basinmentioning

confidence: 99%

“…In the northeast it lies unconformably over the metamorphic rocks of the Strandja Massif (Figure 2, Less et al., 2011); the present contacts between the Eocene limestones and the Strandja Massif largely corresponds to the middle/late Eocene shoreline. In the west the Soğucak Formation lies unconformably over the metamorphic rocks of the Circum‐Rhodope Complex (e.g., Boyanov & Goranov, 2001; Kopp, 1965; Okay et al., 2010). South of the Ganos Fault coeval limestones lie unconformably over serpentinite and pelagic sedimentary rocks.…”

Section: Stratigraphy Of the Thrace Basin Ss In The Light Of The New ...mentioning

confidence: 99%

Thrace Basin—An Oligocene Clastic Basin Formed During the Exhumation of the Rhodope Complex

Okay,

Özcan,

Siyako

et al. 2023

Tectonics

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Some orogenic sedimentary basins are difficult to assign to a particular category. An example is the hydrocarbon‐bearing Thrace Basin in the northern Aegean. It has more than 9‐km‐thick Cenozoic clastic sediment, and is spatially associated with the Rhodope metamorphic core complex in the west, and with the Tethyan subduction‐accretion complexes in the south, and is cut by the North Anatolian Fault and its precursors. It has been interpreted variously as an intramontane, a forearc, or an orogenic collapse basin. Here, we provide new geochronological and biostratigraphic data to constrain the tectonic evolution of the Thrace Basin. The new data indicate that as an individual depocenter the Thrace Basin has a short age span (late Eocene—Oligocene, 36–28 Ma) and more than 90% of the basin fill consists of early Oligocene (34–28 Ma) siliciclastic turbidites, deposited at rates of 1.0 km/my. Paleocurrents and new detrital zircon U‐Pb ages show that the Rhodope Complex was the main sediment source. The exhumation of the northern Rhodope Complex (36–28 Ma) was coeval with the main subsidence in the Thrace Basin (34–28 Ma), and involved clockwise crustal rotation in the northern Aegean and possibly crustal flow from underneath the Thrace Basin. Crustal rotation is indicated by the paleomagnetic data, regional stretching lineations in the Rhodope Complex, and the triangular shape of the Thrace Basin. The rotating crustal block must have been bounded in the south by a sinistral fault zone; the location of which corresponds largely with the present day North Anatolian Fault.

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Palaeoenvironmental evaluation by geochemical proxies of fluvio‐lacustrine core log from the Late Miocene–Pliocene Maritsa Iztok Basin, Bulgaria

Milakovska

Stefanova

Vladislavov³

et al. 2020

Geological Journal

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A sequence of three lignite seams and interlayering carbonaceous mudstone is characterized by geochemical proxies. The study is extended by the palaeoenvironmental details given by the fossil fauna (gastropods, ostracods, and fishes). The predominant minerals (quartz and kaolinite) and main oxide relations of the carbonaceous mudstone point to sand and clay washed from weathered and/or altered felsic rocks from the catchment area. The mudstone features to deposition from suspension in standing or slow to persistently moving fresh waters at the bottom of the core log, and slightly aerated, warm, fresh to low saline, acidic to alkaline waters on the top. Three communities of organisms are depicted. The first is the pre‐swamp environment characterized by standing or slow moving fresh waters and detrital organic matter deposition. The second is the environment of swamp of detrital forest trunks. Depending on the climate and water table, the main forest communities are of trees of families Cupressaceae, Taxodiaceae, and Podocarpaceae accompanied by trees of family Betulaceae, and herbaceous plants. Different Sphagnum species are also abundant. The dry/cold environment is reflected in the herbaceous organic matter deposition. Polar terpenoids ratio differentiates slight climatic oscillations for the samples with a strong Gymnospermae dominance. The second coal seam development reflects the optimum tectonic conditions for peat growth in a cold and dry climate leading up to 25 m lignite deposition. The third is the moss swamp environment with very fluctuating elements. At the top of the log, a Sphagnum‐dominated peat has developed.

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Late Alpine (Palaeogene) superimposed depressions in parts of Southeast Bulgaria

Cited by 29 publications

References 2 publications

New structural and petrologic data on Mesozoic schists in the Rhodope (Bulgaria): geodynamic implications

New structural and petrologic data on Mesozoic schists in the Rhodope (Bulgaria): geodynamic implications

Thrace Basin—An Oligocene Clastic Basin Formed During the Exhumation of the Rhodope Complex

Palaeoenvironmental evaluation by geochemical proxies of fluvio‐lacustrine core log from the Late Miocene–Pliocene Maritsa Iztok Basin, Bulgaria

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