Early Oligocene Supereruption in SE Europe Outlined by 33.3 Ma U‒Pb Ages for Lemnos Tuff and Correlation with Regional Ash Deposits

Marchev, Peter; Raicheva, Raya; Ivanova, Rositsa; Peytcheva, Irena; Grozdev, Valentin

doi:10.7546/crabs.2021.03.11

Cited by 5 publications

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“…The period 33-32 Ma was characterized by intensive silicic volcanism in the Rhodope Complex, the largest eruptions originating from the Eastern Rhodope Borovitsa volcano (Figure 1a). The main Borovitsa eruptions occurred at 32.5-32.9 Ma and resulted in ash deposition over a very large area (Marchev et al, 2020), the tuffs close to the contact between the Gaziköy and Keşan formations (32.8 ± 0.3 to 32.2 ± 0.2 Ma, Figure 4) are probably linked to these eruptions. This implies an age of 32.7 ± 0.2 Ma for the contact between the Gaziköy and Keşan formations.…”

Section: Lower Oligocene Turbidites-the Gaziköy Keşan and Ceylan Form...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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Section: Lower Oligocene Turbidites-the Gaziköy Keşan and Ceylan Form...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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“…Статията на Marchev et al (2021) разглежда два пласта от риолитови туфи, разкриващи се на о-в Лемнос (Гърция) -техния петрографски състав и U-Pb цирконова възраст. Въз основа на тези данни те са корелирани с пирокластитите на Дъждовнишката свита в Източните Родопи и съответно Боровишката калдера се предлага като техен общ източник.…”

unclassified

“…Според тях той не е "в района между селата Скална глава и Костино" (фиг. 1), южно от Боровишката калдера, както предлага Yanev (2007), а в самата калдера, в северния борд на която са датирани две риолитови дайки от Тополово-Новаковския сноп с K/Ar възраст 33,55±1,31 Ма и 33,64±1,28 Ма (Marchev et al, 2013(Marchev et al, , 2021. Основните доводи на авторите за това са, че в предполагания от Янев вулкански център отсъства калдера, задължително условие (според тях) при една суперерупция, както и наличието на риолитови класти в Дъждовнишките пирокластити, докато в подложката на предполагаемия вулкан в района на Скална глава отсъстват риолити.…”

unclassified

“…Защо не може пирокластитите на Дъждовнишката свита да са дошли от вулкан в Боровишката калдера, както твърдят Марчев и съавтори в дискутираната статия? Ако се проследи изменението на дебелината и характера на пирокластитите към Боровишката калдера се констатира (Yanev, 2007), че: на север към калдерата дебелината на пирокластитите, вместо да се увеличава към предлагания от Marchev et al (2021) център на изригване, намалява от 120 m до тяхното изклинване при мах. Небеска (фиг.…”

unclassified

“…Къде може да се намира източникът на тези пирокластити, разкриващи се в Боровишката калдера? Най-общо е предположено, че той е в самата калдера (Yanev, 1990(Yanev, , 2017, а Marchev et al (2021) ги свързват с датираните от тях две риолитови дайки от Тополово-Новаковския сноп в северния борд на калдерата (виж по-горе). Около тях обаче не се наблюдава характерната за един вулкански център зоналност в литологията на отложените вулкански продукти.…”

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Comments on the paper of Peter Marchev et al. “Early Oligocene supereruption in SE Europe outlined by 33.3 Ma U-Pb ages for Lemnos tuff and correlation with regional ash deposits” – C. R. Acad. Bulg. Sci., 74, 3, 2021, 396–405.

Yanev¹

2021

Rev. Bulg. Geol. Soc.

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These critical notes challenge the interpretation of the authors of the article that the volcanic source of the described tuffs on the island of Lemnos (Greece) is the source of Dazhdovnitsa tuffs (beginning of the Oligocene) and that it is located in the Bororvitsa caldera, Eastern Rhodopes. However, there are large regions between this caldera and the island of Lemnos (e.g. between the villages of Podkova and Dobromirtsi in the southern part of the Eastern Rhodopes), where no pyroclastic layers are found at the base of the Oligocene section, corresponding to the stratigraphic position of the Dazhdovnitsa tuffs. It has been suggested that the volcanic source of Lemnos tuffs may be located in the Kalotiko volcanic region, situated essentially in Northern Greece. It has a multi-phase Rupelian volcanic activity, but it is not dated in detail.

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The large Rupelian Rhodope Massif eruptions as the source of airfall tuffs in SE, S and Central Europe: 40Ar/39Ar and U–Pb age constraints

Marchev,

Raicheva,

Jicha

et al. 2024

Int J Earth Sci (Geol Rundsch)

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Early Oligocene Supereruption in SE Europe Outlined by 33.3 Ma U‒Pb Ages for Lemnos Tuff and Correlation with Regional Ash Deposits

Cited by 5 publications

References 0 publications

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

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

Comments on the paper of Peter Marchev et al. “Early Oligocene supereruption in SE Europe outlined by 33.3 Ma U-Pb ages for Lemnos tuff and correlation with regional ash deposits” – C. R. Acad. Bulg. Sci., 74, 3, 2021, 396–405.

The large Rupelian Rhodope Massif eruptions as the source of airfall tuffs in SE, S and Central Europe: 40Ar/39Ar and U–Pb age constraints

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