Lower Eocene sedimentary succession and microfossil biostratigraphy in the central northern Caucasus basin
The lower Eocene sediments from the classical Paleogene section exposed along the Kheu River, northern Caucasus, southern Russia are here studied. This ca. 50m thick succession is lithologically contrasting: the lower and upper parts are composed by soft marls separated by a thick Radiolaria-rich un...
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| Format: | Article |
| Language: | English |
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Universitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB)
2020-01-01
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| Series: | Geologica Acta |
| Subjects: | |
| Online Access: | https://revistes.ub.edu/index.php/GEOACTA/article/view/GeologicaActa2020.18.1/30822 |
| _version_ | 1797662748224520192 |
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| author | E. Shcherbinina A. Iakovleva Yu. Gavrilov O. Golovanova N. Muzylöv |
| author_facet | E. Shcherbinina A. Iakovleva Yu. Gavrilov O. Golovanova N. Muzylöv |
| author_sort | E. Shcherbinina |
| collection | DOAJ |
| description | The lower Eocene sediments from the classical Paleogene section exposed along the Kheu River, northern Caucasus, southern Russia are here studied. This ca. 50m thick succession is lithologically contrasting: the lower and upper parts are composed by soft marls separated by a thick Radiolaria-rich unit of non-calcareous and low-calcareous mudstones with intercalations of compact cherty layers. According to nannofossil and dinocyst biostratigraphy, the unique intercalation of Total Organic Carbon (TOC)-rich sediment (sapropelitic bed) in the lower part of the lower Eocene correspond to the Paleocene-Eocene Thermal Maximum (PETM) and a series of sapropelitic interlayers in the upper marly part of the lower Eocene succession correlates with the Early Eocene Climatic Optimum (EECO). The study of nannofossil and dinocyst assemblages enabled detailed zonal subdivision and first-order calibration of nannofossil and dinocyst bio-events during this time-span. The studied interval of the section embraces the complete succession of nannofossil zones NP9-NP13 of Martini, 1971, CP8-CP11 of Okada and Bukry, 1980 and CNP11-CNE5 of Agnini et al., 2014. By means of dinocyst stratigraphy, the succession of Apectodinium hyperacanthum, Axiodinium augustum, Deflandrea oebisfeldensis, Dracodinium astra, Stenodinium meckelfeldense, Dracodinium varielongitudum, Ochetodinium romanum/Samlandia chlamydophora and Areosphaeridium diktyoplokum zones are identified in the Ypresian part of the Kheu section. |
| first_indexed | 2024-03-11T19:04:38Z |
| format | Article |
| id | doaj.art-ac41fe7a933647c9981ca5cc50d552d7 |
| institution | Directory Open Access Journal |
| issn | 1696-5728 |
| language | English |
| last_indexed | 2024-03-11T19:04:38Z |
| publishDate | 2020-01-01 |
| publisher | Universitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB) |
| record_format | Article |
| series | Geologica Acta |
| spelling | doaj.art-ac41fe7a933647c9981ca5cc50d552d72023-10-10T09:50:05ZengUniversitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB)Geologica Acta1696-57282020-01-0118111510.1344/GeologicaActa2020.18.1Lower Eocene sedimentary succession and microfossil biostratigraphy in the central northern Caucasus basinE. Shcherbinina0https://orcid.org/0000-0002-6124-3837A. Iakovleva1Yu. Gavrilov 2O. Golovanova3N. Muzylöv4Geological Institute of the Russian Academy of SciencesGeological Institute of the Russian Academy of SciencesGeological Institute of the Russian Academy of SciencesGeological Institute of the Russian Academy of SciencesGeological Institute of the Russian Academy of SciencesThe lower Eocene sediments from the classical Paleogene section exposed along the Kheu River, northern Caucasus, southern Russia are here studied. This ca. 50m thick succession is lithologically contrasting: the lower and upper parts are composed by soft marls separated by a thick Radiolaria-rich unit of non-calcareous and low-calcareous mudstones with intercalations of compact cherty layers. According to nannofossil and dinocyst biostratigraphy, the unique intercalation of Total Organic Carbon (TOC)-rich sediment (sapropelitic bed) in the lower part of the lower Eocene correspond to the Paleocene-Eocene Thermal Maximum (PETM) and a series of sapropelitic interlayers in the upper marly part of the lower Eocene succession correlates with the Early Eocene Climatic Optimum (EECO). The study of nannofossil and dinocyst assemblages enabled detailed zonal subdivision and first-order calibration of nannofossil and dinocyst bio-events during this time-span. The studied interval of the section embraces the complete succession of nannofossil zones NP9-NP13 of Martini, 1971, CP8-CP11 of Okada and Bukry, 1980 and CNP11-CNE5 of Agnini et al., 2014. By means of dinocyst stratigraphy, the succession of Apectodinium hyperacanthum, Axiodinium augustum, Deflandrea oebisfeldensis, Dracodinium astra, Stenodinium meckelfeldense, Dracodinium varielongitudum, Ochetodinium romanum/Samlandia chlamydophora and Areosphaeridium diktyoplokum zones are identified in the Ypresian part of the Kheu section.https://revistes.ub.edu/index.php/GEOACTA/article/view/GeologicaActa2020.18.1/30822nannofossilsdinocystsbiostratigraphylithologysapropelitesne peri-tethysnorthern caucasusypresianlower eocene |
| spellingShingle | E. Shcherbinina A. Iakovleva Yu. Gavrilov O. Golovanova N. Muzylöv Lower Eocene sedimentary succession and microfossil biostratigraphy in the central northern Caucasus basin Geologica Acta nannofossils dinocysts biostratigraphy lithology sapropelites ne peri-tethys northern caucasus ypresian lower eocene |
| title | Lower Eocene sedimentary succession and microfossil biostratigraphy in the central northern Caucasus basin |
| title_full | Lower Eocene sedimentary succession and microfossil biostratigraphy in the central northern Caucasus basin |
| title_fullStr | Lower Eocene sedimentary succession and microfossil biostratigraphy in the central northern Caucasus basin |
| title_full_unstemmed | Lower Eocene sedimentary succession and microfossil biostratigraphy in the central northern Caucasus basin |
| title_short | Lower Eocene sedimentary succession and microfossil biostratigraphy in the central northern Caucasus basin |
| title_sort | lower eocene sedimentary succession and microfossil biostratigraphy in the central northern caucasus basin |
| topic | nannofossils dinocysts biostratigraphy lithology sapropelites ne peri-tethys northern caucasus ypresian lower eocene |
| url | https://revistes.ub.edu/index.php/GEOACTA/article/view/GeologicaActa2020.18.1/30822 |
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