Evaluation and application of foraminiferal element/calcium ratios: Assessing riverine fluxes and environmental conditions during sapropel S1 in the Southeastern Mediterranean
| Autor: | Mojtahid, M., Hennekam, R., De Nooijer, L., Reichart, G.-J., Jorissen, F., Boer, W., Le Houedec, S., De Lange, G. J., Stratigraphy & paleontology, Stratigraphy and paleontology, Geochemistry, Marine geochemistry & chemical oceanography |
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| Přispěvatelé: | Laboratoire de Planétologie et Géodynamique [UMR 6112] (LPG), Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Stratigraphy & paleontology, Stratigraphy and paleontology, Geochemistry, Marine geochemistry & chemical oceanography |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Mediterranean climate
010506 paleontology Salinity 010504 meteorology & atmospheric sciences Oceanography 01 natural sciences Mg/Ca 14. Life underwater 0105 earth and related environmental sciences Productivity Stable isotopes Stable isotope ratio Sapropel S1 Palaeontology Paleontology Hypoxia (environmental) Sapropel Plankton Levantine basin Oxygenation 13. Climate action Benthic zone [SDU]Sciences of the Universe [physics] Na/Ca Ba/Ca Seawater Mn/Ca |
| Zdroj: | Marine Micropaleontology Marine Micropaleontology, Elsevier, 2019, 153, pp.101783-. ⟨10.1016/j.marmicro.2019.101783⟩ Marine Micropaleontology, 153. Elsevier |
| ISSN: | 0377-8398 |
| DOI: | 10.1016/j.marmicro.2019.101783⟩ |
| Popis: | Paleostudies often rely on foraminiferal calcite chemistry, which reflect past sea water condition through so-called proxy relationships. One way to evaluate robustness of these proxy relationships is to test them in well-studied and during well-constrained climate transitions. The southeastern (SE) Mediterranean is a perfect natural laboratory with a large range of past environmental conditions. These range from low productivity well-ventilated waters like they are at present, to poorly ventilated, high productivity conditions during sapropels. We here explore the reliability of recently developed foraminiferal-based proxies (Ba/Ca, Mn/Ca, Na/Ca) as tracers for changes in productivity, oxygenation and salinity during the most recent sapropel S1. We use laser ablation ICP-MS analyses of the planktonic G. ruber and six benthic species (B. alata, G. affinis, G. altiformis, G. orbicularis, H. boueana, U. peregrina). Our results show that planktonic Ba/Ca is a reliable tracer for Ba2+-enriched Nile outflow, where benthic Ba/Ca traces enhanced paleo(export) productivity relatively well. The interpretation of Mn/Ca data is less straightforward, and the low values may suggest a lower precipitation of Mn-oxides under prevailing hypoxia. The decrease in planktonic and benthic Na/Ca is coherent with excess Nile runoff lowering salinities in the |
| Databáze: | OpenAIRE |
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