The Jurassic/Cretaceous boundary and high resolution biostratigraphy of the pelagic sequences of the kurovice section (Outer Western Carpathians, the northern Tethyan margin)
Microfacies and high resolution studies at the Kurovice quarry (Czech Republic, Outer Western Carpathians) on calpionellids, calcareous and non-calcareous dinoflagellate cysts, sporomorphs and calcareous nannofossils, aligned with paleomagnetism, allow construction of a detailed stratigraphy and pal...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Earth Science Institute, Slovak Academy of Sciences, Slovakia
2019-04-01
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| Series: | Geologica Carpathica |
| Subjects: | |
| Online Access: | http://www.degruyter.com/view/j/geoca.2019.70.issue-2/geoca-2019-0009/geoca-2019-0009.xml?format=INT |
| _version_ | 1819162440649146368 |
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| author | Svobodová Andrea Švábenická Lilian Reháková Daniela Svobodová Marcela Skupien Petr Elbra Tiiu Schnabl Petr |
| author_facet | Svobodová Andrea Švábenická Lilian Reháková Daniela Svobodová Marcela Skupien Petr Elbra Tiiu Schnabl Petr |
| author_sort | Svobodová Andrea |
| collection | DOAJ |
| description | Microfacies and high resolution studies at the Kurovice quarry (Czech Republic, Outer Western Carpathians) on calpionellids, calcareous and non-calcareous dinoflagellate cysts, sporomorphs and calcareous nannofossils, aligned with paleomagnetism, allow construction of a detailed stratigraphy and paleoenvironmental interpretation across the Jurassic/Cretaceous (J/K) boundary. The Kurovice section consists of allodapic and micrite limestones and marlstones. Identified standard microfacies types SMF 2, SMF 3 and SMF 4 indicate that sediments were deposited on a deep shelf margin (FZ 3), with a change, later, into distal basin conditions and sediments (FZ 1). The sequence spans a stratigraphic range from the Early Tithonian calcareous dinoflagellate Malmica Zone, nannoplankton zone NJT 15 and magnetozone M 21r to the late Early Berriasian calpionellid Elliptica Subzone of the Calpionella Zone, nannoplankton NK-1 Zone and M 17r magnetozone. The J/K boundary is marked by a quantitative increase of small forms of Calpionella alpina, the base of the Alpina Subzone (that corresponds to NJT 17b and M 19n.2n) and by the rare occurrence of Nannoconus wintereri. Palynomorphs include Early Berriasian terrestrial elements — non-calcareous dinoflagellate cysts Achomosphaera neptunii, Prolixosphaeridium sp. A and Tehamadinium evittii. The depositional area for Kurovice was situated at the margin of the NW Tethys. The influence of cold waters from northern latitudes and potential upwellings is highlighted by: 1) the high proportion of radiolarians and sponge spicules, 2) rare calpionellids represented mostly by hyaline forms, 3) the absence of microgranular calpionellids — chitinoidellids, 4) the small percentage of the genera Nannoconus, Polycostella and Conusphaera in nannofossil assemblages, as compared to other sites in Tethys, 5) scarce Nannoconus compressus, which has otherwise been mentioned from the Atlantic area. |
| first_indexed | 2024-12-22T17:28:16Z |
| format | Article |
| id | doaj.art-9e22c9c1913a4b998dda16a604a26e4d |
| institution | Directory Open Access Journal |
| issn | 1336-8052 |
| language | English |
| last_indexed | 2024-12-22T17:28:16Z |
| publishDate | 2019-04-01 |
| publisher | Earth Science Institute, Slovak Academy of Sciences, Slovakia |
| record_format | Article |
| series | Geologica Carpathica |
| spelling | doaj.art-9e22c9c1913a4b998dda16a604a26e4d2022-12-21T18:18:41ZengEarth Science Institute, Slovak Academy of Sciences, SlovakiaGeologica Carpathica1336-80522019-04-0170215318210.2478/geoca-2019-0009geoca-2019-0009The Jurassic/Cretaceous boundary and high resolution biostratigraphy of the pelagic sequences of the kurovice section (Outer Western Carpathians, the northern Tethyan margin)Svobodová Andrea0Švábenická Lilian1Reháková Daniela2Svobodová Marcela3Skupien Petr4Elbra Tiiu5Schnabl Petr6The Czech Academy of Sciences, Institute of Geology, Rozvojová 269, 165 00 Prague, Czech RepublicCzech Geological Survey, Klárov 131/3, 118 21 Prague, Czech RepublicComenius University, Faculty of Natural Sciences, Department of Geology and Paleontology, Mlynská dolina G. Ilkovičova 6, 842 15 Bratislava, SlovakiaThe Czech Academy of Sciences, Institute of Geology, Rozvojová 269, 165 00 Prague, Czech RepublicInstitute of Geological Engineering, VŠB — Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava-Poruba, Czech RepublicThe Czech Academy of Sciences, Institute of Geology, Rozvojová 269, 165 00 Prague, Czech RepublicThe Czech Academy of Sciences, Institute of Geology, Rozvojová 269, 165 00 Prague, Czech RepublicMicrofacies and high resolution studies at the Kurovice quarry (Czech Republic, Outer Western Carpathians) on calpionellids, calcareous and non-calcareous dinoflagellate cysts, sporomorphs and calcareous nannofossils, aligned with paleomagnetism, allow construction of a detailed stratigraphy and paleoenvironmental interpretation across the Jurassic/Cretaceous (J/K) boundary. The Kurovice section consists of allodapic and micrite limestones and marlstones. Identified standard microfacies types SMF 2, SMF 3 and SMF 4 indicate that sediments were deposited on a deep shelf margin (FZ 3), with a change, later, into distal basin conditions and sediments (FZ 1). The sequence spans a stratigraphic range from the Early Tithonian calcareous dinoflagellate Malmica Zone, nannoplankton zone NJT 15 and magnetozone M 21r to the late Early Berriasian calpionellid Elliptica Subzone of the Calpionella Zone, nannoplankton NK-1 Zone and M 17r magnetozone. The J/K boundary is marked by a quantitative increase of small forms of Calpionella alpina, the base of the Alpina Subzone (that corresponds to NJT 17b and M 19n.2n) and by the rare occurrence of Nannoconus wintereri. Palynomorphs include Early Berriasian terrestrial elements — non-calcareous dinoflagellate cysts Achomosphaera neptunii, Prolixosphaeridium sp. A and Tehamadinium evittii. The depositional area for Kurovice was situated at the margin of the NW Tethys. The influence of cold waters from northern latitudes and potential upwellings is highlighted by: 1) the high proportion of radiolarians and sponge spicules, 2) rare calpionellids represented mostly by hyaline forms, 3) the absence of microgranular calpionellids — chitinoidellids, 4) the small percentage of the genera Nannoconus, Polycostella and Conusphaera in nannofossil assemblages, as compared to other sites in Tethys, 5) scarce Nannoconus compressus, which has otherwise been mentioned from the Atlantic area.http://www.degruyter.com/view/j/geoca.2019.70.issue-2/geoca-2019-0009/geoca-2019-0009.xml?format=INTTithonianBerriasiancalcareous and non-calcareous microfossilscalcareous nannofossilspalynomorphsmagnetostratigraphy |
| spellingShingle | Svobodová Andrea Švábenická Lilian Reháková Daniela Svobodová Marcela Skupien Petr Elbra Tiiu Schnabl Petr The Jurassic/Cretaceous boundary and high resolution biostratigraphy of the pelagic sequences of the kurovice section (Outer Western Carpathians, the northern Tethyan margin) Geologica Carpathica Tithonian Berriasian calcareous and non-calcareous microfossils calcareous nannofossils palynomorphs magnetostratigraphy |
| title | The Jurassic/Cretaceous boundary and high resolution biostratigraphy of the pelagic sequences of the kurovice section (Outer Western Carpathians, the northern Tethyan margin) |
| title_full | The Jurassic/Cretaceous boundary and high resolution biostratigraphy of the pelagic sequences of the kurovice section (Outer Western Carpathians, the northern Tethyan margin) |
| title_fullStr | The Jurassic/Cretaceous boundary and high resolution biostratigraphy of the pelagic sequences of the kurovice section (Outer Western Carpathians, the northern Tethyan margin) |
| title_full_unstemmed | The Jurassic/Cretaceous boundary and high resolution biostratigraphy of the pelagic sequences of the kurovice section (Outer Western Carpathians, the northern Tethyan margin) |
| title_short | The Jurassic/Cretaceous boundary and high resolution biostratigraphy of the pelagic sequences of the kurovice section (Outer Western Carpathians, the northern Tethyan margin) |
| title_sort | jurassic cretaceous boundary and high resolution biostratigraphy of the pelagic sequences of the kurovice section outer western carpathians the northern tethyan margin |
| topic | Tithonian Berriasian calcareous and non-calcareous microfossils calcareous nannofossils palynomorphs magnetostratigraphy |
| url | http://www.degruyter.com/view/j/geoca.2019.70.issue-2/geoca-2019-0009/geoca-2019-0009.xml?format=INT |
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