Benthic foraminiferal turnover across the Dan-C2 event in the eastern South Atlantic Ocean (ODP Site 1262)

Arreguín-Rodríguez, Gabriela J.; Barnet, James S K; Leng, Melanie J.; Littler, Kate; Kroon, Dick; Schmidt, Daniela N.; Thomas, Ellen; Alegret, Laia

doi:10.1016/j.palaeo.2021.110410

Cited by 11 publications

(8 citation statements)

References 91 publications

(183 reference statements)

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“…3C, Table 2), suggesting that they have similar ecological preferences, including a tolerance for suboxic conditions and refractory organic matter. This interpretation is consistent with that for other buliminiids, which are usually cylindrical and tapered and associated with high fluxes of low-quality organic matter (Koutsoukos et al 1990; Coccioni and Galeotti 1993; Gooday 1993; Ortiz et al 2011; Orabi and Khalil 2014; Deprez et al 2017; Arreguín-Rodriguez et al 2021). Thus, B. fabilis can be used as an additional indicator of environments with refractory organic matter and suboxic conditions.…”

Section: Discussionsupporting

confidence: 89%

Spatial heterogeneity in benthic foraminiferal assemblages tracks regional impacts of paleoenvironmental change across Cretaceous OAE2

Bryant

Belanger²

2023

Paleobiology

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The impact of global climate events on local ecosystems can vary spatially. Understanding this potential heterogeneity can illuminate which environments will be most impacted and the proximal drivers of ecosystem responses. Cenomanian–Turonian marine deposits of the Western Interior Seaway (WIS) record paleoceanographic changes associated with the Greenhorn transgression and the onset of Oceanic Anoxic Event 2 (OAE2). They provide an ideal setting to study basin-wide paleoecological responses during a global perturbation. Here, we integrate benthic foraminiferal assemblages from before, during, and after OAE2 via multivariate ordination analysis to examine spatial patterns in faunal responses across the western United States on a common scale and to interrogate a previously defined faunal marker commonly used for basin-wide correlation, the Benthonic Zone (BZ). We identify oxygenation and organic matter quality as primary and secondary controls of faunal variation across the 10 stratigraphic records and use this variation to infer paleoenvironmental changes. Stratigraphic trends reveal, in contrast to previous studies, deoxygenation at the onset of OAE2. They also reveal temporal patterns in oxygenation and productivity consistent with the gradual northward migration of a southern water mass into the WIS. This spatial heterogeneity hinders the use of the BZ as a temporal marker, because assemblages change in response to diachronous environmental change, and thus timing of the BZ with respect to OAE2 is not consistent across the basin. Our study demonstrates that regional processes can overshadow ecosystem responses to global events and underscores the importance of considering how changes in the position of water masses impact the expression of global biogeochemical perturbations.

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Section: Discussionsupporting

confidence: 89%

Spatial heterogeneity in benthic foraminiferal assemblages tracks regional impacts of paleoenvironmental change across Cretaceous OAE2

Bryant

Belanger²

2023

Paleobiology

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“…However, it has been noted that, in deep marine sediments (Walvis Ridge and ODP Site 1262), benthic foraminifera were not affected by this hyperthermal event, although they did go through periods of environmental stress before the onset of Dan‐C2 (Arreguín‐Rodríguez et al . 2021). It is also important to note that the poor calcareous nannofossil and foraminifera fauna recovered by Concheyro et al .…”

Section: Discussionmentioning

confidence: 99%

Ostracods from the Cretaceous–Palaeogene boundary at El Matuasto Section, Neuquén Basin, Argentina: taxonomy, palaeoecological and palaeobiogeographical inferences

Ceolin,

Santos Filho,

Concheyro

et al. 2024

Papers in Palaeontology

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This work presents a taxonomic, palaeoecological and palaeobiogeographical study of the ostracod fauna around the Cretaceous–Palaeogene boundary from the El Matuasto section, Neuquén Basin, Argentina. The analysis of 64 samples resulted in the recovery of 82 marine ostracod species, of which four are new: Hemiparacytheridea condilomata, Paramunseyella stictus, Hysterocythereis acuminata and Aleisocythereis? picnus. In addition, the genera Sapucariella, Monoceratina, Aracajuia, Microceratina and Pelecocythere are reported for the first time from the Neuquén Basin. Palaeoecological inferences indicate fluctuations in abundance and diversity, occurring alongside environmental change from an inner to medium shelf during the Maastrichtian and to an outer shelf in the Danian. The Maastrichtian fauna was less abundant than that in the Danian, which shows a rapid recovery after the Cretaceous–Palaeogene boundary. During the Danian, a small interval also shows a sudden decrease in abundance and diversity that could potentially be related to the Dan‐C2 event. In addition, the described genera and species in this study suggest a strong palaeobiogeographical affinity with the Paraíba Basin, northeastern Brazil.

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“…Following the Chicxulub impact, the absolute abundance of benthic foraminifera increased (Arreguín-Rodríguez et al, 2021) and bottom water temperature (BWT ) rose by ~3℃ in the tropical Pacific and by 1.5−2℃ in the South Atlantic (Jung et al, 2013;Barnet et al, 2018), while SST oscillated between 23−34℃ in the south-western Tethys (Keller and Lindinger, 1989). More importantly, dust clouds and possible sulfate aerosols resulting in the impact winter would only circulate within the atmosphere for an extremely short duration, with estimates ranging from less than ten years (Kring, 2003) to millennia at most (Galeotti et al, 2004).…”

Section: Variations Of Pco 2 Concentration Documenting Vibrant Climat...mentioning

confidence: 99%

Longer-term terrestrial responses in the aftermath of the end-Cretaceous mass extinction

Wang

et al. 2023

Preprint

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Mass-extinction with instantaneous and short-term effects on extreme climate and deteriorated ocean environment across the Cretaceous/Paleogene boundary (K/PgB) has been verified by an array of geological records, however, a longer-term (~100−1000 Kyr) post-K/PgB variation remain poorly understood, particularly due to the scarcity of terrestrial records. This study presents carbon isotope analyses of pedogenic carbonates in the Nanxiong Basin, South China to reconstruct carbon cycles and atmospheric CO concentrations (pCO) spanning 70.0–62.0 Ma. Combined with data from Songliao Basin (China) and Tornillo Basin (USA), δC displays a post-K/PgB (66.0-64.5 Ma) vibration that is correlative to the surface ocean but mirroring to the bottom ocean. The vibration shows a pattern of collapse and smooth towards rebound, constituting a process of ~400 Kyr (millennia) deterioration, ~300 Kyr stabilization and ~800 Kyr recovery for the longer-term ecosystem and environment. A similar pattern is observed for the reconstructed pCO, correlating to changes of sea surface temperature (SST) but contrasting bottom water temperature (BWT). With the discrepancy of longer-term proxy variations, it is proposed that ecosystems and environments in terrestrial and surface ocean had experienced a more unstable, difficult and erratic recovery process and were much more sensitive to climatic changes than in deep ocean for ~1.5 million years in the aftermath of the end-Cretaceous mass extinction. In addition, the decoupling of proxy variations from expected effects implies Deccan volcanism and Chicxulub impact may not have played a key role in the longer-term CO perturbation and environmental change following the K/PgB.

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Benthic foraminiferal turnover across the Dan-C2 event in the eastern South Atlantic Ocean (ODP Site 1262)

Cited by 11 publications

References 91 publications

Spatial heterogeneity in benthic foraminiferal assemblages tracks regional impacts of paleoenvironmental change across Cretaceous OAE2

Spatial heterogeneity in benthic foraminiferal assemblages tracks regional impacts of paleoenvironmental change across Cretaceous OAE2

Ostracods from the Cretaceous–Palaeogene boundary at El Matuasto Section, Neuquén Basin, Argentina: taxonomy, palaeoecological and palaeobiogeographical inferences

Longer-term terrestrial responses in the aftermath of the end-Cretaceous mass extinction

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