High Arctic late Paleocene and early Eocene dinoflagellate cysts
<p>Palynomorphs, notably sporomorphs and organic-walled dinoflagellate cysts, or “dinocysts”, are the only abundant microfossils consistently present in the sole available central Arctic upper Paleocene to lower Eocene sedimentary succession recovered at the central Lomonosov Ridge by the Inte...
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Copernicus Publications
2024-11-01
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| Series: | Journal of Micropalaeontology |
| Online Access: | https://jm.copernicus.org/articles/43/441/2024/jm-43-441-2024.pdf |
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| author | A. Sluijs H. Brinkhuis H. Brinkhuis |
| author_facet | A. Sluijs H. Brinkhuis H. Brinkhuis |
| author_sort | A. Sluijs |
| collection | DOAJ |
| description | <p>Palynomorphs, notably sporomorphs and organic-walled dinoflagellate cysts, or “dinocysts”, are the only abundant microfossils consistently present in the sole available central Arctic upper Paleocene to lower Eocene sedimentary succession recovered at the central Lomonosov Ridge by the Integrated Ocean Drilling Program (IODP) Expedition 302 (or the Arctic Coring Expedition, ACEX) in 2004, close to the North Pole. While the analysis and interpretation of a part of these assemblages have so far guided many major stratigraphic, climatological, and paleoenvironmental findings from ACEX, intrinsic details, notably of the dinocyst taxa and assemblages, have not yet been addressed. Here, we present new ACEX dinocyst data for the interval spanning the latest Paleocene to the earliest Eocene (<span class="inline-formula">∼56.5</span>–53.8 Ma; cores 32X–27X) and integrate these with previous results. We develop a pragmatic taxonomic framework, document critical biostratigraphic events, and propose two new genera (<i>Guersteinia</i> and <i>Sangiorgia</i>) and seven new species (<i>Batiacasphaera obohikuenobeae</i>, <i>Chaenosphaerula sliwinskae</i>, <i>Heterolaucacysta pramparoae,</i> <i>Pyxidinopsis iakovlevae</i>, <i>Sangiorgia pospelovae</i>, <i>Sangiorgia marretiae</i>, and <i>Spiniferella crouchiae</i>). In addition, we interpret trends and aberrations in dinocyst assemblages in terms of variability in regional temperature, hydrology, and tectonism across the long-term and the Paleocene–Eocene Thermal Maximum (PETM) and Eocene Thermal Maximum 2 (ETM2) global warming phases.</p> |
| format | Article |
| id | doaj-art-5595887f8f724827b2c8c52ee9fc8c11 |
| institution | Kabale University |
| issn | 0262-821X 2041-4978 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Journal of Micropalaeontology |
| spelling | doaj-art-5595887f8f724827b2c8c52ee9fc8c112024-11-08T10:29:15ZengCopernicus PublicationsJournal of Micropalaeontology0262-821X2041-49782024-11-014344147410.5194/jm-43-441-2024High Arctic late Paleocene and early Eocene dinoflagellate cystsA. Sluijs0H. Brinkhuis1H. Brinkhuis2Department of Earth Sciences, Laboratory of Palaeobotany and Palynology, Faculty of Geosciences, Utrecht University, 3584 CB Utrecht, the NetherlandsDepartment of Earth Sciences, Laboratory of Palaeobotany and Palynology, Faculty of Geosciences, Utrecht University, 3584 CB Utrecht, the NetherlandsDepartment of Ocean Systems (OCS), Royal Netherlands Institute for Sea Research (NIOZ), PO Box 1790 AB Den Burg, the Netherlands<p>Palynomorphs, notably sporomorphs and organic-walled dinoflagellate cysts, or “dinocysts”, are the only abundant microfossils consistently present in the sole available central Arctic upper Paleocene to lower Eocene sedimentary succession recovered at the central Lomonosov Ridge by the Integrated Ocean Drilling Program (IODP) Expedition 302 (or the Arctic Coring Expedition, ACEX) in 2004, close to the North Pole. While the analysis and interpretation of a part of these assemblages have so far guided many major stratigraphic, climatological, and paleoenvironmental findings from ACEX, intrinsic details, notably of the dinocyst taxa and assemblages, have not yet been addressed. Here, we present new ACEX dinocyst data for the interval spanning the latest Paleocene to the earliest Eocene (<span class="inline-formula">∼56.5</span>–53.8 Ma; cores 32X–27X) and integrate these with previous results. We develop a pragmatic taxonomic framework, document critical biostratigraphic events, and propose two new genera (<i>Guersteinia</i> and <i>Sangiorgia</i>) and seven new species (<i>Batiacasphaera obohikuenobeae</i>, <i>Chaenosphaerula sliwinskae</i>, <i>Heterolaucacysta pramparoae,</i> <i>Pyxidinopsis iakovlevae</i>, <i>Sangiorgia pospelovae</i>, <i>Sangiorgia marretiae</i>, and <i>Spiniferella crouchiae</i>). In addition, we interpret trends and aberrations in dinocyst assemblages in terms of variability in regional temperature, hydrology, and tectonism across the long-term and the Paleocene–Eocene Thermal Maximum (PETM) and Eocene Thermal Maximum 2 (ETM2) global warming phases.</p>https://jm.copernicus.org/articles/43/441/2024/jm-43-441-2024.pdf |
| spellingShingle | A. Sluijs H. Brinkhuis H. Brinkhuis High Arctic late Paleocene and early Eocene dinoflagellate cysts Journal of Micropalaeontology |
| title | High Arctic late Paleocene and early Eocene dinoflagellate cysts |
| title_full | High Arctic late Paleocene and early Eocene dinoflagellate cysts |
| title_fullStr | High Arctic late Paleocene and early Eocene dinoflagellate cysts |
| title_full_unstemmed | High Arctic late Paleocene and early Eocene dinoflagellate cysts |
| title_short | High Arctic late Paleocene and early Eocene dinoflagellate cysts |
| title_sort | high arctic late paleocene and early eocene dinoflagellate cysts |
| url | https://jm.copernicus.org/articles/43/441/2024/jm-43-441-2024.pdf |
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