Microfossil fragmentation across the Paleocene-Eocene transition at ODP Site 1209 (North Pacific): implication for reconstructing nannofossil fluxes
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2023
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| _version_ | 1867171377392386048 |
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| author | Pige, Nicolas Suan, Guillaume Buiron, Eddy Langlois, Vincent J Mehir, Alyssa Vinçon-Laugier, Arnauld Mattioli, Emanuela |
| author_facet | Pige, Nicolas Suan, Guillaume Buiron, Eddy Langlois, Vincent J Mehir, Alyssa Vinçon-Laugier, Arnauld Mattioli, Emanuela |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | We present a database of microfossil fragmentation and nannofossil assemblages during the Paleocene-Eocene transition at ODP Site 1209 leg 198 (North Pacific). We propose a new method based on nannofossil fragment counts to reconstruct an all-inclusive nannofossil absolute abundances (entire nannofossils plus fragments). Using nannofossil assemblages and foraminiferal-based dissolution proxies we detect a 400 kyrs dissolution event occurring some 300 kyrs before the Paleocene-Eocene Thermal Maximum. A total of 56 samples were analysed using a scanning electron microscope (SEM) and 28 were analysed with a light-polarized microscope. Samples were prepared using a slightly modified version of the settling method described by Beaufort et al. (2014; doi:10.1038/nprot.2014.028). For each sample, the depth (slightly modified from Westerhold et al. (2018; doi:10.1029/2017PA003306), weight and studied surface area are reported. The counts, absolute and relative abundances of entire nannofossils and fragment groups benefit from a confidence interval at 95% (calculated according to Suchéras-Marx et al., 2019; doi:10.1016/j.marmicro.2019.101751) as well as the nannofossil fragmentation. A statistical treatment (Analysis of Variance) of the main nannofossil groups was performed using the software Past4.0 to compare the results of the analysis performed using SEM and light-polarized microscope. The reconstruction of nannofossil abundance using the different categories of placolith fragments is provided with the 95% confidence interval. Overgrown and dissolution were assessed using a Discoaster spp. overgrowth scale based on Dedert et al. (2014; doi:0.1016/j.marmicro.2013.12.004) and dissolution proxies (planktonic foraminifera fragmentation %, benthic/planktonic ratio %, sediment coarse fraction %). All these proxies have a 95% confidence interval except the coarse fraction from which the weighting error is provided. Finally, our database includes 73 bulk carbonate isotope measurements of the δ13C and δ18O. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_956786 |
| institution | PANGAEA |
| language | en |
| publishDate | 2023 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Microfossil fragmentation across the Paleocene-Eocene transition at ODP Site 1209 (North Pacific): implication for reconstructing nannofossil fluxes Pige, Nicolas Suan, Guillaume Buiron, Eddy Langlois, Vincent J Mehir, Alyssa Vinçon-Laugier, Arnauld Mattioli, Emanuela Calcareous nannofossils; Microfossil fragmentation; Paleocene-Eocene transition We present a database of microfossil fragmentation and nannofossil assemblages during the Paleocene-Eocene transition at ODP Site 1209 leg 198 (North Pacific). We propose a new method based on nannofossil fragment counts to reconstruct an all-inclusive nannofossil absolute abundances (entire nannofossils plus fragments). Using nannofossil assemblages and foraminiferal-based dissolution proxies we detect a 400 kyrs dissolution event occurring some 300 kyrs before the Paleocene-Eocene Thermal Maximum. A total of 56 samples were analysed using a scanning electron microscope (SEM) and 28 were analysed with a light-polarized microscope. Samples were prepared using a slightly modified version of the settling method described by Beaufort et al. (2014; doi:10.1038/nprot.2014.028). For each sample, the depth (slightly modified from Westerhold et al. (2018; doi:10.1029/2017PA003306), weight and studied surface area are reported. The counts, absolute and relative abundances of entire nannofossils and fragment groups benefit from a confidence interval at 95% (calculated according to Suchéras-Marx et al., 2019; doi:10.1016/j.marmicro.2019.101751) as well as the nannofossil fragmentation. A statistical treatment (Analysis of Variance) of the main nannofossil groups was performed using the software Past4.0 to compare the results of the analysis performed using SEM and light-polarized microscope. The reconstruction of nannofossil abundance using the different categories of placolith fragments is provided with the 95% confidence interval. Overgrown and dissolution were assessed using a Discoaster spp. overgrowth scale based on Dedert et al. (2014; doi:0.1016/j.marmicro.2013.12.004) and dissolution proxies (planktonic foraminifera fragmentation %, benthic/planktonic ratio %, sediment coarse fraction %). All these proxies have a 95% confidence interval except the coarse fraction from which the weighting error is provided. Finally, our database includes 73 bulk carbonate isotope measurements of the δ13C and δ18O. |
| title | Microfossil fragmentation across the Paleocene-Eocene transition at ODP Site 1209 (North Pacific): implication for reconstructing nannofossil fluxes |
| topic | Calcareous nannofossils; Microfossil fragmentation; Paleocene-Eocene transition |
| url | https://doi.org/10.1594/PANGAEA.956786 |