2026-09-16T19:44:51Zhttps://gredos.usal.es/oai/requestoai:gredos.usal.es:10366/1608442024-11-30T01:00:41Zcom_10366_4128com_10366_4055com_10366_3946com_10366_3823col_10366_4129
Gestión del Repositorio Documental de la Universidad de Salamanca
author
Ballegeer, Anne-Marie Clara
author
Flores Villarejo, José Abel
author
Sierro Sánchez, Francisco Javier
author
Rigual Hernández, Andrés Salvador
2024-11-29T12:53:46Z
2024-11-29T12:53:46Z
2022
Ballegeer, A. M., Flores, J. A., Sierro, F. J., & Rigual-Hernández, A. S. (2022). Coccolith dissolution versus productivity changes during the Plio-Pleistocene (3.14–1.80 MA) in the South Atlantic (ODP site 1090). Palaeogeography, Palaeoclimatology, Palaeoecology, 603, 111184.
0031-0182
http://hdl.handle.net/10366/160844
10.1016/j.palaeo.2022.111184
[EN] Calcareous nannofossil assemblages and fragmentation ratios of two coccolithophore species (Coccolithus pelagicus
and Calcidiscus leptoporus) were analysed in samples from ODP Site 1090, South Atlantic (42◦ 54.8′ S, 8◦
53.9′ E), to obtain valuable insights into the paleoceanographic evolution and carbonate preservation trends
during the late Pliocene and Early Pleistocene (3.14–1.80 Ma). Coccolithophore species were identified in a total
of 232 samples. Calcareous nannofossil counts revealed shifts in the assemblages that can be correlated with the
climatic evolution of the Southern Ocean. Between 3.2 and 2.85 Ma, i.e. during the mid-Pliocene Warmth, the
assemblage was dominated by small Gephyrocapsa, a group of species typically associated with upwelling conditions.
The dominance of the opportunistic small Gephyrocapsa group can be linked to a more intense mixing of
the upper water column most likely due to the more southward position of the Subtropical Front (STF) compared
with its present position. After 2.85 Ma, a gradual increase in the cold water species C. pelagicus marked a
progressive cooling of the South Atlantic coupled with a northward shift of the (STF). The changes in the
assemblage composition co-varied with the δ18O record. Periods with isotopically heavier values (glacial) were
dominated by C. pelagicus and periods with lighter values (interglacial) were dominated by very small reticulofenestrids
(VSR; <3 μm). After 2.7 Ma, an intensification of the glacial-interglacial patterns of C. pelagicus and
VSR was registered. The interval between 2.44 and 2.34 Ma was characterised by low abundance of C. pelagicus
and higher biodiversity which are interpreted to be due to a temporal southward movement of the STF interrupting
the previously registered cooling. After 2.0 Ma, the decreasing abundance of C. pelagicus suggests a
slowdown of the relatively intense cooling registered since 2.7 Ma. The fragmentation ratios of C. pelagicus and
C. leptoporus suggest moderate preservation along our interval, with a general trend toward better preservation
after 2.2 Ma. This enhanced preservation has been related to a greater input of the less-corrosive northern
component water mass into the Cape Basin after 2.2 Ma. The lack of significant glacial-interglacial variations in
the fragmentation ratios suggests that the low amplitude of the glacial cycles did not have a substantial impact on
the carbonate preservation throughout the entire interval. During MIS 99–98 (approximately 2.5 Ma), a
remarkably high accumulation of VSR was found and identified as a short (9 ka) event of high productivity. The
timing of this event coincides with that of the Eltanin impact (approximately 2.5 Ma), suggesting that, albeit
speculatively, the two events may be related.
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Calcareous nannofossils
Southern Ocean
Plio-Pleistocene
Palaeoceanography
Eltanin
Nanofósiles
Antártico, Océano
Paleoceanografía
Coccolith dissolution versus productivity changes during the Plio-Pleistocene (3.14–1.80 MA) in the South Atlantic (ODP site 1090)
info:eu-repo/semantics/article
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