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  • McKay, ClaireLund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science (author)

A comparison of benthic foraminiferal Mn/Ca and sedimentary Mn/Al as proxies of relative bottom-water oxygenation in the low-latitude NE Atlantic upwelling system.

  • Article/chapterEnglish2015

Publisher, publication year, extent ...

  • 2015-09-18
  • Copernicus GmbH,2015
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:nrm-1500
  • https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-1500URI
  • https://doi.org/10.5194/bg-12-5415-2015DOI
  • https://lup.lub.lu.se/record/8074203URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Trace element incorporation into foraminiferal shells (tests) is governed by physical and chemical conditions of the surrounding marine environment, and therefore foraminiferal geochemistry provides a means of palaeo-oceanographic reconstructions. With the availability of high-spatial-resolution instrumentation with high precision, foraminiferal geochemistry has become a major research topic over recent years. However, reconstructions of past bottom-water oxygenation using foraminiferal tests remain in their infancy. In this study we explore the potential of using Mn / Ca determined by secondary ion mass spectrometry (SIMS) as well as by flow-through inductively coupled plasma optical emission spectroscopy (FT-ICP-OES) in the benthic foraminiferal species Eubuliminella exilis as a proxy for recording changes in bottom-water oxygen conditions in the low-latitude NE Atlantic upwelling system. Furthermore, we compare the SIMS and FT-ICP-OES results with published Mn sediment bulk measurements from the same sediment core. This is the first time that benthic foraminiferal Mn / Ca is directly compared with Mn bulk measurements, which largely agree on the former oxygen conditions. Samples were selected to include different productivity regimes related to Marine Isotope Stage 3 (35–28 ka), the Last Glacial Maximum (28–19 ka), Heinrich Event 1 (18–15.5 ka), Bølling Allerød (15.5–13.5 ka) and the Younger Dryas (13.5–11.5 ka). Foraminiferal Mn / Ca determined by SIMS and FT-ICP-OES is comparable. Mn / Ca was higher during periods with high primary productivity, such as during the Younger Dryas, which indicates low-oxygen conditions. This is further supported by the benthic foraminiferal faunal composition. Our results highlight the proxy potential of Mn / Ca in benthic foraminifera from upwelling systems for reconstructing past variations in oxygen conditions of the sea floor environment as well as the need to use it in combination with other proxy records such as faunal assemblage data.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Groeneveld, JeroenLund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science,University of Bremen(Swepub:lu)geol-jgl (author)
  • Filipsson, HelenaLund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science(Swepub:lu)geol-h_f (author)
  • Gallego-Torres, D. (author)
  • Whitehouse, Martin J.,1962-Naturhistoriska riksmuseet,Enheten för geovetenskap,Nordsim(Swepub:nrm)martwhit (author)
  • Toyofuku, T. (author)
  • Romero, O.E. (author)
  • KvartärgeologiGeologiska institutionen (creator_code:org_t)

Related titles

  • In:Biogeosciences: Copernicus GmbH12, s. 5415-54281726-41701726-4189

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