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Foraminiferal Mn/Ca...
Foraminiferal Mn/Ca as Bottom-Water Hypoxia Proxy: An Assessment of Nonionella stella in the Santa Barbara Basin, USA
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- Brinkmann, I. (author)
- Lund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science
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- Ni, S. (author)
- Lund University,Lunds universitet,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Kvartärgeologi,Geologiska institutionen,Centre for Environmental and Climate Science (CEC),Faculty of Science,Quaternary Sciences,Department of Geology
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- Schweizer, M. (author)
- Angers University
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- Oldham, V. E. (author)
- Woods Hole Oceanographic Institution
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- Quintana Krupinski, N. B. (author)
- Lund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science
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- Medjoubi, K. (author)
- Synchrotron SOLEIL
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- Somogyi, A. (author)
- Synchrotron SOLEIL
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- Whitehouse, M. J. (author)
- Swedish Museum of Natural History
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- Hansel, C. M. (author)
- Woods Hole Oceanographic Institution
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- Barras, C. (author)
- Angers University
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- Bernhard, J. M. (author)
- Woods Hole Oceanographic Institution
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- Filipsson, H. L. (author)
- Lund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science
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(creator_code:org_t)
- 2021
- 2021
- English.
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In: Paleoceanography and Paleoclimatology. - 2572-4517. ; 36:11
- Related links:
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http://dx.doi.org/10... (free)
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
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- Hypoxia is of increasing concern in marine areas, calling for a better understanding of mechanisms leading to decreasing dissolved oxygen concentrations ([O2]). Much can be learned about the processes and implications of deoxygenation for marine ecosystems using proxy records from low-oxygen sites, provided proxies, such as the manganese (Mn) to calcium (Ca) ratio in benthic foraminiferal calcite, are available and well calibrated. Here we report a modern geochemical data set from three hypoxic sites within the Santa Barbara Basin (SBB), USA, where we study the response of Mn/Caforam in the benthic foraminifer Nonionella stella to variations in sedimentary redox conditions (Mn, Fe) and bottom-water dissolved [O2]. We combine molecular species identification by small subunit rDNA sequencing with morphological characterization and assign the SBB N. stella used here to a new phylotype (T6). Synchrotron-based scanning X-ray fluorescence (XRF) imaging and Secondary Ion Mass Spectrometry (SIMS) show low Mn incorporation (partition coefficient DMn < 0.05) and limited proxy sensitivity of N. stella, at least within the range of dissolved [O2] (2.7–9.6 μmol/l) and Mnpore-water gradients (2.12–21.59 μmol/l). Notably, even though intra- and interspecimen Mn/Ca variability (33% and 58%, respectively) was only partially controlled by the environment, Mn/Caforam significantly correlated with both pore-water Mn and bottom-water [O2]. However, the prevalent suboxic bottom-water conditions and limited dissolved [O2] range complicate the interpretation of trace-elemental trends. Additional work involving other oxygenation proxies and samples from a wider oxygen gradient should be pursued to further develop foraminiferal Mn/Ca as an indicator for hypoxic conditions.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Keyword
- benthic foraminifera
- Deoxygenation
- micro-analytical techniques
- Mn
- Ca
- proxy calibration
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Brinkmann, I.
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Ni, S.
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Schweizer, M.
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Oldham, V. E.
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Quintana Krupins ...
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Medjoubi, K.
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show more...
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Somogyi, A.
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Whitehouse, M. J ...
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Hansel, C. M.
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Barras, C.
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Bernhard, J. M.
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Filipsson, H. L.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geology
- Articles in the publication
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Paleoceanography ...
- By the university
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Lund University