Evolution of organogenic carbonate buildups in the Middle through Late Miocene of the Euxine-Caspian Basin (Eastern Paratethys)

Goncharova, I. A.; Rostovtseva, Yu. V.

doi:10.1134/s0031030109080048

Cited by 14 publications

(8 citation statements)

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“…The first regression interval is ~ 50 m thick and contains organogenic carbonate buildups (bryozoan-algal and microbial-algal mats) 21 , interbedded with finely laminated dolomitized limestones 22 and clays (Figs. S2 – S5 , Table S1 ).…”

Section: Introductionmentioning

confidence: 99%

“…Multiple faunal groups disappeared, and the endemic fauna was greatly reduced, indicating a significant biological crisis for aquatic life. The second regression phase contains organogenic carbonate buildups (bryozoan-algal mats 21 ), interbedded with finely laminated limestones and clays, indicating paleobathymetric reductions alternating with incomplete recovery phases. This regression is not clearly described in the literature, likely because it occurred shortly after the previous episode.…”

Section: Introductionmentioning

confidence: 99%

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Late Miocene megalake regressions in Eurasia

Palcu

Patina

Şandric

et al. 2021

Sci Rep

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The largest megalake in the geological record formed in Eurasia during the late Miocene, when the epicontinental Paratethys Sea became tectonically-trapped and disconnected from the global ocean. The megalake was characterized by several episodes of hydrological instability and partial desiccation, but the chronology, magnitude and impacts of these paleoenvironmental crises are poorly known. Our integrated stratigraphic study shows that the main desiccation episodes occurred between 9.75 and 7.65 million years ago. We identify four major regressions that correlate with aridification events, vegetation changes and faunal turnovers in large parts of Europe. Our paleogeographic reconstructions reveal that the Paratethys was profoundly transformed during regression episodes, losing ~ 1/3 of the water volume and ~ 70% of its surface during the most extreme events. The remaining water was stored in a central salt-lake and peripheral desalinated basins while vast regions (up to 1.75 million km2) became emergent land, suitable for development of forest-steppe landscapes. The partial megalake desiccations match with climate, food-web and landscape changes throughout Eurasia, although the exact triggers and mechanisms remain to be resolved.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Late Miocene megalake regressions in Eurasia

Palcu

Patina

Şandric

et al. 2021

Sci Rep

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“…In Galician (Moldova) and Borysthen (Crimea) Gulfs of the Paratethys, the algal-Nubecu laria bioherms in the Vasilievo and the upper part of the Novomoskovsk beds (horizons) were formed during the Bessarabian (= Upper Sarmatian s.s.). Five species of red algae in symbiosis with Nu becularia novorossica, and with the presence of bryozoans and cyanobacteria, formed both nodules (5.0-40.0 cm in diameter) and round loaf-shaped bioherms up to 2.0-3.0 m high (Goncharova, Rostovtseva, 2009). Compared with the above examples, the stratified limestones of the studied sections contain predominantly Nubecularia novorossica solitaria and Nubecularia novorossica nodula tests (Plate I) as a rock-forming component.…”

Section: Plate II таблица Iimentioning

confidence: 84%

Origin of the Bessarabian limestones with Nubecularia novorossica of Northeastern Bulgaria

Koleva-Rekalova¹,

Darakchieva²

2020

Rev. Bulg. Geol. Soc.

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The Central and Eastern Paratethys Basins were connected and the joint Sarmatian Sea (Paratethys) appeared after the end of the Badenian. It was separated from the Mediterranean and Indopacific Ocean. As a result, the seawater salinity dropped and mass production of a few euryhaline groups (mainly benthic foraminifera, molluscs, and ostracods) with increasing endemisms developed at the beginning of the Sarmatian (s.l. and s.s.). The fauna and paleoenvironments (facies) were similar throughout the Paratethys. The Bessarabian limestones (referred to the Odartsi Formation) are composed almost entirely of the endemic foraminifera Nubecularia novorossica Karrer & Sinzow, 1877 and exposed on the territory of Northeastern Bulgaria are described in the present article. Six sections were examined, and it was found that the limestones were predominantly stratified and only in the upper parts of some sections were dome-shaped. Two varieties Nubecularia novorossica solitaria and Nubecularia novorossica nodula were defined and they are the predominant rock-forming constituent. The most appropriate environmental conditions for the occurrence, blooming and accumulation in the initial sediments of the Nubecularia novorossica tests were identified. Comparison with the findings of this nubeculariid from other Sarmatian sections reveals that the stratified limestones studied are rigid mainly due to the presence of cement, whereas abundant encrusting and microbial organisms in the dome-shaped bodies contributed to the formation of their rigid framework.

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“…They frequently have a characteristic cauliflower shape on their surface. Bryostromatolites are first found in the Late Ordovician (Kröger et al 2017) but are better described from the Silurian and Miocene (Goncharova and Rostovtseva 2009;Saint Martin and Pestrea 1999;Ernst et al 2015;Brandano et al 2017;Sladkovskaya 2017;Claussen et al 2022). The Miocene bryostromatolites are only found in the Tethys and Paratethys around the time of the Messinian salinity crisis (Goncharova and Rostovtseva 2009;Saint Martin and Saint Martin 2015), which suggests that stressed environments assist the formation of bryostromatolites even during ancient times.…”

Section: Bryostromatolitesmentioning

confidence: 99%

“…Bryostromatolites are first found in the Late Ordovician (Kröger et al 2017) but are better described from the Silurian and Miocene (Goncharova and Rostovtseva 2009;Saint Martin and Pestrea 1999;Ernst et al 2015;Brandano et al 2017;Sladkovskaya 2017;Claussen et al 2022). The Miocene bryostromatolites are only found in the Tethys and Paratethys around the time of the Messinian salinity crisis (Goncharova and Rostovtseva 2009;Saint Martin and Saint Martin 2015), which suggests that stressed environments assist the formation of bryostromatolites even during ancient times. While these bryostromatolites are also bryoliths because they are formed by somewhat detectable units that are roughly spheroidal in shape, this paper follows Palinska et al (1999) in referring to them as bryostromatolites to avoid confusion with the rolling bryozoan multilayered crusts found elsewhere in the world and more commonly called bryoliths (Moissette et al 2010;Tâmega et al 2019).…”

Section: Bryostromatolitesmentioning

confidence: 99%

Modern brackish bryostromatolites (“bryoliths”) from Zeeland (Netherlands)

Harrison

Claussen

Schulbert

et al. 2021

Palaeobio Palaeoenv

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Bryostromatolites are found in stressed environments from the Paleozoic to the Recent. They are formed by alternating layers of bryozoans and microbes. This study investigates recent bryostromatolites in brackish ponds in the Netherlands to better understand ancient analogues and the environments which hosted them. They formed a fringing reef at the site Ronde Weel and a barrier reef at Kaaskenswater. The ponds had low biodiversity with only one bivalve species, two gastropod species, one ostracod species, and three diatom species comprising most of the easily fossilizable taxa; one isopod species, one decapod species, and two polychaete species were also present. Observations of microbial layers and cementation practices indicate that an alternation of bryozoan-favouring conditions and microbe-favouring conditions is essential to forming bryostromatolites. The collected bryostromatolites only had tiny living bryozoan patches. Water tests confirmed a brackish environment but with enriched arsenic and titanium concentrations and periodic euxinia. The extreme environment explains the lack of biodiversity and may provide information about the environments in which past bryostromatolites formed.

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Evolution of organogenic carbonate buildups in the Middle through Late Miocene of the Euxine-Caspian Basin (Eastern Paratethys)

Cited by 14 publications

References 4 publications

Late Miocene megalake regressions in Eurasia

Late Miocene megalake regressions in Eurasia

Origin of the Bessarabian limestones with Nubecularia novorossica of Northeastern Bulgaria

Modern brackish bryostromatolites (“bryoliths”) from Zeeland (Netherlands)

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