Calcareous nannofossil during the Paleocene Eocene Thermal Maximum in sediments of Walvish Ridge
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2009
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| _version_ | 1867168559089582080 |
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| author | Raffi, Isabella Backman, Jan Zachos, James C Sluijs, Appy |
| author_facet | Raffi, Isabella Backman, Jan Zachos, James C Sluijs, Appy |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Compositions and abundances of calcareous nannofossil taxa have been determined in a ca 170 kyrs long time interval across the Paleocene/Eocene boundary at 1-cm to 10-cm resolution from two ODP Sites (1262, 1263) drilled along the flank of the Walvis Ridge in the South Atlantic. The results are compared to published data from ODP Site 690 in the Weddell Sea. The assemblages underwent rapid evolution over a 74 kyrs period, indicating stressed, unstable and/or extreme photic zone environments during the PETM hyperthermal. This rapid evolution, which created 5 distinct stratigraphic horizons, is consistent with the restricted brief occurrences of malformed and/or weakly calcified morphotypes. The production of these aberrant morphotypes is possibly caused by major global scale changes in carbon cycling in the ocean-atmosphere system, affecting also photic zone environments. No marked paleoecologically induced changes are observed in abundances of the genera Discoaster, Fasciculithus and Sphenolithus at the Walvis Ridge sites. Surprisingly, there is no significant correlation in abundance between these three genera, presumed to have had a similar paleoecological preference for warm and oligotrophic conditions. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_774062 |
| institution | PANGAEA |
| language | en |
| publishDate | 2009 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Calcareous nannofossil during the Paleocene Eocene Thermal Maximum in sediments of Walvish Ridge Raffi, Isabella Backman, Jan Zachos, James C Sluijs, Appy 208-1262A; 208-1262B; 208-1263C; 208-1263D; DRILL; Drilling/drill rig; Joides Resolution; Leg208; Ocean Drilling Program; ODP; Walvis Ridge, Southeast Atlantic Ocean Compositions and abundances of calcareous nannofossil taxa have been determined in a ca 170 kyrs long time interval across the Paleocene/Eocene boundary at 1-cm to 10-cm resolution from two ODP Sites (1262, 1263) drilled along the flank of the Walvis Ridge in the South Atlantic. The results are compared to published data from ODP Site 690 in the Weddell Sea. The assemblages underwent rapid evolution over a 74 kyrs period, indicating stressed, unstable and/or extreme photic zone environments during the PETM hyperthermal. This rapid evolution, which created 5 distinct stratigraphic horizons, is consistent with the restricted brief occurrences of malformed and/or weakly calcified morphotypes. The production of these aberrant morphotypes is possibly caused by major global scale changes in carbon cycling in the ocean-atmosphere system, affecting also photic zone environments. No marked paleoecologically induced changes are observed in abundances of the genera Discoaster, Fasciculithus and Sphenolithus at the Walvis Ridge sites. Surprisingly, there is no significant correlation in abundance between these three genera, presumed to have had a similar paleoecological preference for warm and oligotrophic conditions. |
| title | Calcareous nannofossil during the Paleocene Eocene Thermal Maximum in sediments of Walvish Ridge |
| topic | 208-1262A; 208-1262B; 208-1263C; 208-1263D; DRILL; Drilling/drill rig; Joides Resolution; Leg208; Ocean Drilling Program; ODP; Walvis Ridge, Southeast Atlantic Ocean |
| url | https://doi.org/10.1594/PANGAEA.774062 |