Insights into the palaeoenvironments, structure and stratigraphy of the lower Miocene of the Eastern Carpathians Bend Zone, Romania

• Autorzy: Bercea Răzvan-Ionuţ , Bălc Ramona , Tămaș Alexandra , Filipescu Sorin , Mircea Tămaș Dan , Guillong Marcel , Flavius Szekely Flavius , Lukács Réka

Identyfikatory

DOI

10.7306/gq.1673

• Języki publikacji: EN

Abstrakty

EN

The ages of several Oligocene to Miocene sedimentary formations from the Eastern Carpathians Bend Zone are poorly constrained due to palaeoenvironmental factors, reworking of fossils, structural complexity and limited exposure. To help overcome these issues, this study integrates calcareous nannoplankton and foraminifera biostratigraphy with isotopic age dating (U-Pb) of volcaniclastic zircons, and sedimentological and structural observations/interpretations. Our study was carried out along an ~6-km-long section made from a series of outcrops along the Bizdidel River which exposes several formations such as the Pucioasa, Fusaru, Vinețișu, Starchiojd and Slon. We show that the Fusaru Formation consists of coarse-grained rocks deposited as confined longitudinal channel successions that migrated laterally. It is bounded by the mud-rich Pucioasa and Vinețișu formations which are lateral equivalents of the Fusaru confined channels deposited as levee/overbank units. These genetically related formations appear to reach younger ages – of the lower to middle Burdigalian based on calcareous nannoplankton and foraminifera biostratigraphy – than previously thought (upper Oligocene to lower Burdigalian). The dominant organic-rich mudstones of the Starchiojd Formation represent pelagites/hemipelagites deposited in anoxic conditions. Their middle Burdigalian age is established by a 17.41 ±0.27 Ma zircon U-Pb age of zircons from the Bătrâni Tuff in the Starchiojd Formation. Based on the similar phenocryst content, zircon U-Pb age and zircon trace element composition, the source of the tuff is suggested to be the 17.3 Ma Eger ignimbrite-forming eruption, which has proximal, near-caldera deposits in the Bükkalja Volcanic Field, Hungary. The mud-rich Slon Formation seems to be related to shelf edge/upslope failure that formed cohesive debrite avalanches resulting from foreland propagation of compression. The Slon Formation extends in this area to at least the upper part of the lower Miocene to middle Miocene. These results highlight the need to revise ages of those parts of the sequence which are poorly constrained or different in other parts of the Carpathian Basin. Such revised ages help to better constrain the understanding of the deformation history of the Carpathians.

Słowa kluczowe

EN

biostratigraphy; tuff; zircon U-Pb age; sedimentology; structural geology

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2023
• Tom: Vol. 67, No. 1
• Strony: art. no. 2
• Opis fizyczny: Bibliogr. 111 poz., fot., tab., wykr.

Twórcy

autor

Bercea Răzvan-Ionuţ

• Babeş-Bolyai University, Department of Geology and Research Center for Integrated Geological Studies, 1 Kogălniceanu Street, 400084 Cluj-Napoca, Romania
• S.N.G.N. Romgaz S.A. Tîrgu-Mureş, 23 Salcâmilor Street, Romania

• https://orcid.org/0000-0002-0438-7770

autor

Bălc Ramona

• Babeş-Bolyai University, Faculty of Environmental Science and Engineering, 30 Fântânele Street, 400294 Cluj-Napoca, Romania
• Babeş-Bolyai University, Interdisciplinary Research Institute on Bio-Nano-Sciences, 42 Treboniu Laurian Street, 400271 Cluj-Napoca, Romania

• https://orcid.org/0000-0002-9419-2351

autor

Tămaș Alexandra

• Babeş-Bolyai University, Department of Geology and Research Center for Integrated Geological Studies, 1 Kogălniceanu Street, 400084 Cluj-Napoca, Romania

• https://orcid.org/0000-0001-8010-1853

autor

Filipescu Sorin

• Babeş-Bolyai University, Department of Geology and Research Center for Integrated Geological Studies, 1 Kogălniceanu Street, 400084 Cluj-Napoca, Romania

• https://orcid.org/0000-0002-6792-9776

autor

Mircea Tămaș Dan

• Babeş-Bolyai University, Department of Geology and Research Center for Integrated Geological Studies, 1 Kogălniceanu Street, 400084 Cluj-Napoca, Romania

• https://orcid.org/0000-0002-6640-8928

autor

Guillong Marcel

• Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zürich, Clausius Strasse 25, 8092 Zürich, Switzerland

• https://orcid.org/+0000-0002-6920-3362

autor

Flavius Szekely Flavius

• Babeş-Bolyai University, Department of Geology and Research Center for Integrated Geological Studies, 1 Kogălniceanu Street, 400084 Cluj-Napoca, Romania

• https://orcid.org/0000-0001-8639-8512

autor

Lukács Réka

• MTA-ELTE Volcanology Research Group, Eötvös Loránd Research Network (ELKH), Pázmány P. sétány 1/C, 1117 Budapest, Hungary
• Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences [MTA Centre of Excellence], Eötvös Loránd Research Network (ELKH), Budaörsi út 45, 1112 Budapest, Hungary

• https://orcid.org/0000-0002-2338-4209

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