Deep Thermohaline Circulation Across the Closure of the Central American Seaway

Öğretmen, Nazik; Schiebel, Ralf; Jochum, Klaus Peter; Stoll, Brigitte; Weis, Ulrike; Repschläger, Janne; Jentzen, Anna; Haug, Gerald H.; Galer, Steve

doi:10.7185/gold2021.3266

Cited by 5 publications

(11 citation statements)

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“…wuellerstorfi in the time Interval I , from 5.2 Ma until 3.3 Ma strongly vary from 0.9 mmol/mol up to 4.7 mmol/mol, but show a constant increase (Figure 3a). A similar increase is notable in Na/Ca values (Figures 3a and 3e; Öğretmen et al., 2020a). The PCA for Interval I confirms this trend, with high factor loadings of Mn/Ca in PC 1 and Na/Ca in PC 2 (Tables S2 and S3 in Supporting Information ).…”

Section: Discussionsupporting

confidence: 73%

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High Precision Femtosecond Laser Ablation ICP‐MS Measurement of Benthic Foraminiferal Mn‐Incorporation for Paleoenvironmental Reconstruction: A Case Study From the Plio‐Pleistocene Caribbean Sea

Öğretmen

Schiebel

Jochum

et al. 2022

Geochem Geophys Geosyst

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Trace elements in foraminiferal calcite are among the most commonly used proxies for reconstructing paleoenvironmental conditions. For instance, Mg/Ca of foraminifer test carbonate is proxy of past temperature variations of ambient seawater (Friedrich et al., 2013;Lear et al., 2000;Nürnberg et al., 1996). B/Ca is used as a surface seawater pH proxy (Yu et al., 2007). In contrast to the proxies of environmental conditions during shell formation, some trace elements are considered proxy of dissolution or encrustation of the original test carbonate. For example, trace metal oxides may crystallize through post-mortem secondary precipitation processes such as authigenic coatings on the foraminifer test (Boyle, 1983) and vigorous cleaning techniques are required for their removal (Barker et al., 2003). Nevertheless, a recent study demonstrates that such cleaning methods cause dissolution of the inner calcite resulting in removal of potentially important environmental indicators including Mn (Fritz-Endres & Fehrenbacher, 2020). Novel results suggest Mn is preferentially incorporated in the ontogenetic carbonate lattice to enhance its chemical stability (Soldati et al., 2016;Son et al., 2019).In oxygenated waters, manganese is dissolved at low concentration (van Hulten et al., 2017), with a residence time of up to 60 years in the water column below 1,500 m (Martin & Knauer, 1980). In seafloor sediments, Mn is found in oxidized forms only in the uppermost oxic layer, and mobilizes under suboxic and anoxic conditions as Mn(II) as well as Mn(III)-ligand complexes (Trouwborst et al., 2006), being an indicator of

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Section: Discussionsupporting

confidence: 73%

“…wuellerstorfi were adopted from Öğretmen et al. (2020b) and plotted against the new C . mundulus trace element data (Figures 3d–3f).…”

Section: Methodsmentioning

confidence: 99%

High Precision Femtosecond Laser Ablation ICP‐MS Measurement of Benthic Foraminiferal Mn‐Incorporation for Paleoenvironmental Reconstruction: A Case Study From the Plio‐Pleistocene Caribbean Sea

Öğretmen

Schiebel

Jochum

et al. 2022

Geochem Geophys Geosyst

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“…Despite the present low range in Pacific equatorial δ 18 Osw values, modern Atlantic-Caribbean surface waters record a salinity value ~3‰ less than the modern EEP (Haug et al, 2001;Garcia et al, 2006;Schmidt et al, 2016;Öğretmen et al, 2020), equating to ~1.5‰ lower in mean δ 18 Osw values (Ravelo and Hillaire-Marcel, 2007). This salinity contrast was fully established by ~4.2 Ma (Haug et al, 2001), and consistent breaching of Atlantic-Caribbean waters over the still-submerged isthmus may have occurred as late as 1.9 Ma (Coates and Obando, 1996;Keller et al, 1989;Schmidt et al, 2016).…”

Section: Pliocene Eep Paleoceanographymentioning

confidence: 89%

Paleoecology and evolutionary response of planktonic foraminifera to the Plio-Pleistocene Intensification of Northern Hemisphere Glaciations

Woodhouse

Procter²,

Jackson³

et al. 2022

Preprint

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Abstract. The Plio-Pleistocene is associated with many important climatic and paleoceanographic changes which have shaped the biotic and abiotic nature of the modern world. The closure of the Central American Seaway and the development and intensification of northern hemisphere icesheets had profound global impacts on the latitudinal and vertical structure of the oceans triggering the extinction and radiation of many marine groups. In particular, marine calcifying planktonic foraminifera, that are sensitive to water column structure, exhibited a series of extinctions as global temperatures fell. By analyzing high-resolution (~5 kyr) sedimentary records from the Eastern Equatorial Pacific Ocean, complimented with global records from the novel Triton dataset, we document the biotic changes in this microfossil group, within which three species displayed isochronous co-extinction, and species with cold-water affinity increase in dominance. We suggest that these changes are associated with the terminal stages of the closure of the Central American Seaway and mark the initiation of a world in which cold- and deep-dwelling species became increasingly more successful.

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“…ruber specimens were picked from the Caribbean ODP Site 999A (10 H 04 35‐37) from size fraction 315–400 μm. The age of the fossil 999A sample is 5.6 Ma (Öğretmen et al., 2020).…”

Section: Methodsmentioning

confidence: 99%

Mesocrystalline Architecture in Hyaline Foraminifer Shells Indicates a Non‐Classical Crystallisation Pathway

Arns

Evans

Schiebel

et al. 2022

Geochem Geophys Geosyst

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Calcareous foraminifers are an abundant group of planktic and benthic marine unicellular organisms, which together constitute an important component of the global carbon cycle (Langer, 2008;Schiebel, 2002). Foraminifer shells (tests) can resist dissolution and diagenesis over millions of years, and hence provide an outstanding archive for climate reconstruction at high time resolution from sediment cores, which is possible via empirical calibration of chemical or physical characteristics of the shells of recent species (e.g., Fischer & Wefer, 1999;Katz et al., 2010). Despite their importance as a paleoclimate archive, the biomineralization of foraminifers is not mechanistically understood in detail, which leaves the fundamental relationship between environmental parameters and proxy data enigmatic. For example, the possible presence of residues of metastable carbonate phases such as vaterite was only recently discovered (Jacob et al., 2017), and the delivery of ions to the biomineralization site is an ongoing topic of debate (

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Deep Thermohaline Circulation Across the Closure of the Central American Seaway

Cited by 5 publications

References 0 publications

High Precision Femtosecond Laser Ablation ICP‐MS Measurement of Benthic Foraminiferal Mn‐Incorporation for Paleoenvironmental Reconstruction: A Case Study From the Plio‐Pleistocene Caribbean Sea

High Precision Femtosecond Laser Ablation ICP‐MS Measurement of Benthic Foraminiferal Mn‐Incorporation for Paleoenvironmental Reconstruction: A Case Study From the Plio‐Pleistocene Caribbean Sea

Paleoecology and evolutionary response of planktonic foraminifera to the Plio-Pleistocene Intensification of Northern Hemisphere Glaciations

Mesocrystalline Architecture in Hyaline Foraminifer Shells Indicates a Non‐Classical Crystallisation Pathway

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