A multiproxy approach to the climate and marine productivity variations along MIS 5 in SE Brazil: A comparison between major components of calcareous nannofossil assemblages and geochemical records

Costa, Karen Badaraco; Cabarcos, Eloy; Santarosa, Ana Cláudia Aoki; Battaglin, Beatriz Bidoli Fernandes; Toledo, Felipe Antonio de Lima

doi:10.1016/j.palaeo.2016.02.032

Cited by 16 publications

(12 citation statements)

References 111 publications

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“…Dentre as pesquisas com foraminíferos planctônicos no sul e sudeste da Margem Continental Brasileira (MCB), destacam-se alguns trabalhos voltados para a paleoceanografia e paleoclimatologia nas bacias de Campos (Arz et al, 1999;Costa et al, 2016;, Santos (Toledo et al, 2007(Toledo et al, a, b, 2008Pivel et al, 2010Pivel et al, , 2011Pivel et al, , 2013Ferreira et al, 2012Ferreira et al, , 2014Chiessi et al, 2014;Lessa et al, 2016;Gonzales et al, 2017;Santos et al, 2017) e Pelotas (Rodrigues & Carvalho, 1980;Chiessi et al, 2008Chiessi et al, , 2014Chiessi et al, , 2015Razik et al, 2013;Voigt et al, 2015;Campos et al, 2017), além da área adjacente na Margem Continental Argentina (Chapori et al, 2015;Voigt et al, 2015). Outros trabalhos são voltados para a bioestratigrafia do Quaternário, destacando-se os estudos nas bacias de Campos (Vicalvi, 1997;Vicalvi, 2013;Portilho-Ramos et al, 2014 a, b;Duarte et al, 2017), Santos (Portilho-Ramos et al, 2006;Ferreira et al, 2012;Vicalvi, 2013;Portilho-Ramos et al, 2014 b;Toledo et al, 2016) e Pelotas (Vicalvi, 1977;Carvalho, 1980;Rodrigues & Carvalho, 1980).…”

Section: Introductionunclassified

Lysocline and CCD Fluctuations Record in Pelotas Basin During the Late Quaternary

et al. 2018

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Os foraminíferos planctônicos são bons indicadores de idade e variações paleoclimáticas, sendo amplamente utilizados na datação relativa, análise de bacias sedimentares e em correlações estratigráficas. No talude inferior da Bacia de Pelotas há uma dificuldade para elaborar modelos paleoclimáticos devido à baixa qualidade dos remanescentes fósseis, que podem ser facilmente dissolvidos ou remobilidados. Porém, a baixa preservação, quando bem quantificada, pode se tornar um indicador paleoceanográfico, uma vez que a não preservação ocorre em função de variações ambientais mensuráveis. O objetivo deste estudo é identificar variações da fauna de foraminíferos planctônicos e a preservação de CaCO 3 registradas em dois testemunhos na Bacia de Pelotas, e relacionálas a mudanças paleoceanográficas ocorridas na região. Os testemunhos foram coletados na operação Geomar VII, no talude inferior da Bacia de Pelotas. As amostras foram preparadas com a metodologia padrão para análises paleomicrontológicas. O zoneamento paleoclimático foi elaborado baseado na presença ou ausência de carbonato e na ocorrência de espécies do plexo Globorotalia menardii, cujos desaparecimentos e reaparecimentos têm relação com oscilações climáticas de intervalos glaciais e interglaciais. Considerando que não há mudança textural significativa nas fácies, os dois testemunhos foram subdivididos em cinco intervalos, mesclando a presença ou ausência de foraminíferos (volume de pelágicos) e a presença ou ausência do plexo G. menardii. Os intervalos com boa preservação de carbonato foram atribuídos aos Estágios Isotópicos Marinhos (EIM) 5 e 1. Os intervalos sem preservação de carbonato foram atribuídos a um deslocamento ascendente da lisoclina e da Profundidade de Compensação do Carbonato (CCD, do inglês Carbonate Compensation Depth). No final do Pleistoceno foi registrado um rebaixamento da lisoclina e da CCD, em função da transição do EIM 2 para o EIM 1 ou do limite Pleistoceno/Holoceno. Finalmente, o limite das biozonas Y e Z foi identificado entre 0,4 e 0,3 m em um dos testemunhos do talude inferior da Bacia de Pelotas.

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Section: Introductionunclassified

Lysocline and CCD Fluctuations Record in Pelotas Basin During the Late Quaternary

et al. 2018

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“…Through these distributions, we can infer that the abundance of coccoliths did not cause changes in the FF. The primary process involved in these changes in the FF was the contribution of external silt-clay minerals associated with terrigenous supply, as observed by Costa et al (2016).…”

Section: Sedimentary Processes As a Function Of Sea-level Variationsmentioning

confidence: 91%

“…The second might be variation in fluvial discharge. In other words, with more precipitation, a higher terrigenous sediment supply would lead to higher values of these proxies during humid periods (Behling et al, 2000;Costa et al, 2016). The third might be percentage dilution of the continental material due to mixing with biogenic marine particles/material.…”

Section: Main Sedimentary Process Driversmentioning

confidence: 99%

“…As primary producers, environmental parameters control coccolithophore distribution and include nutrient availability, light, and temperature (Winter et al, 1994). These factors make this fossil group a valuable tool in paleoceanographic and paleoproductivity reconstructions (Flores et al, 1999(Flores et al, , 2000Toledo et al, 2007;Saavedra-Pellitero et al, 2011;Leonhardt et al, 2013;Cabarcos et al, 2014;Costa et al, 2016). Therefore, combining coccolithophore records with geochemical sedimentary proxies is ideal for understanding how climate change in past environments affected these organisms, especially in regard to paleoproductivity (Zhou et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Marine Paleoproductivity From the Last Glacial Maximum to the Holocene in the Southwestern Atlantic: A Coccolithophore Assemblage and Geochemical Proxy Perspective

Pedrão

Hirama²,

Tomazella³

et al. 2022

Front. Earth Sci.

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In this study, we associated the variations in coccolithophore assemblages with the variability in major elements (Fe, Ca, and Ti) from the continental slope of the western South Atlantic by investigating two marine sediment cores (GL-824 and GL-1109) to reconstruct paleoceanographic and paleoproductivity changes from the Last Glacial Maximum (LGM) to the present. Terrigenous-supply proxies (Fe/Ca and Ti/Ca) showed a very similar pattern compared with the fine-fraction sediments, higher values throughout the LGM and lower values during the Holocene. The dominant species in the coccolithophore assemblages were Emiliania huxleyi, Gephyrocapsa spp., and Florisphaera profunda, with these species together representing between 82 and 99% of the total assemblage. Additionally, we used three other subordinate species (Umbellosphaera ssp., Rhabdosphaera spp., and Syracosphaera spp.) for paleoproductivity reconstruction. The estimates of primary production using F. profunda and Gephyrocapsa spp. exhibited a similar trend, with higher productivity values during the LGM. Paleoproductivity decreased toward the Late Holocene. Analyzing these results, we observed that the oscillation of relative sea level was the process that controlled paleoproductivity, primarily by changing the position of the main flow of the Brazil Current (BC). During periods of high sea level (low Fe/Ca and Ti/Ca), the BC transported warm and oligotrophic water to the upper slope, preventing any nutrient transport from deeper layers or coastal water. In contrast, during low sea-level periods (high Fe/Ca and Ti/Ca), the offshore displacement of the BC allowed the presence of coastal water (more nutrient-rich than tropical water) and the erosion of the exposed shelf that along with a more enhanced fluvial input provided more nutrients to the photic zone, thus enhancing primary productivity.

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“…Foraminifera are a very diverse group of marine shelly organisms that are commonly used for paleoenvironmental reconstructions using the isotopic or elemental composition that is recorded in their carbonate shell (Costa et al, 2016;Gray and Evans, 2019;Sen Gupta, 2003;Hönisch et al, 2011;Lear and Rosenthal, 2006;Petersen et al, 2018;Raddatz et al, 2017). They first appeared in the Cambrian and, over the course of the Phanerozoic, occupied oceanic settings from coastal waters to the open ocean, as well as the benthic habitats of the deep sea (Goldstein, 1999).…”

Section: Introductionmentioning

confidence: 99%

Host influenced geochemical signature in the parasitic foraminifer Hyrrokkin sarcophaga

Schleinkofer¹,

Evans²,

Wisshak³

et al. 2021

Preprint

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Abstract. Hyrrokkin sarcophaga is a parasitic foraminifer that is commonly found in cold-water coral reefs where it infests the file clam Acesta excavata and the scleractinian coral Lophelia pertusa. Here, we present measurements of the elemental and isotopic composition of this parasitic foraminifer for the first time, analyzed by inductively coupled optical emission spectrometry (ICP-OES), electron probe micro analysis (EPMA) and mass spectrometry (MS).Our results reveal that the geochemical signature of H. sarcophaga depends on the host organism it infests. Sr/Ca ratios are 1.1 mmol mol−1 higher in H. sarcophaga that infest L. pertusa, which could be an indication that dissolved host carbonate material is utilised in shell calcification, given that the aragonite of L. pertusa has a naturally higher Sr concentration compared to the calcite of A. excavata. Similarly, we measure 3.1 ‰ lower δ13C and 0.25 ‰ lower δ18O values in H. sarcophaga that lived on L. pertusa, which might be caused by the direct uptake of the host's carbonate material with a more negative isotopic composition or different pH regimes in these foraminifera (pH can exert a control on the extent of CO2 hydration/hydroxylation) due to the uptake of body fluids of the host. We also observe higher Mn/Ca ratios in foraminifers that lived on A. excavata but did not penetrate the host shell compared to specimen that penetrated the shell, which could be interpreted as a change in food source, changes in the calcification rate, Rayleigh fractionation or changing oxygen conditions.While our measurements provide an interesting insight into the calcification process of this unusual foraminifer, these data also indicate that the geochemistry of this parasitic foraminifer is unlikely to be a reliable indicator of paleoenvironmental conditions using Sr/Ca, Mn/Ca, δ18O or δ13C unless the host organism is known and its geochemical composition can be accounted for.

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A multiproxy approach to the climate and marine productivity variations along MIS 5 in SE Brazil: A comparison between major components of calcareous nannofossil assemblages and geochemical records

Cited by 16 publications

References 111 publications

Lysocline and CCD Fluctuations Record in Pelotas Basin During the Late Quaternary

Lysocline and CCD Fluctuations Record in Pelotas Basin During the Late Quaternary

Marine Paleoproductivity From the Last Glacial Maximum to the Holocene in the Southwestern Atlantic: A Coccolithophore Assemblage and Geochemical Proxy Perspective

Host influenced geochemical signature in the parasitic foraminifer Hyrrokkin sarcophaga

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