, phytoplankton, and the nature of the Late Cretaceous and early Cenozoic Arctic Ocean

Magavern, Shelly; Clark, David L.; Clark, Steven L.

doi:10.1016/0025-3227(96)00024-2

Cited by 13 publications

(10 citation statements)

References 29 publications

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“… Magavern et al [1996] reported Sr isotopic results for Eocene fish debris (at ∼45 Ma) from a piston core at Alpha Ridge in the Amerasian Basin that are very similar to ours ( 87 Sr/ 86 Sr = 0.7081–0.7086 versus 0.7078–0.7088). They concluded that the high 87 Sr/ 86 Sr ratios reflected diagenetic alteration and/or Sr gain from surrounding pore waters (cleaning and leaching experiments were not performed in that study).…”

Section: Discussionsupporting

confidence: 83%

Early to middle Eocene history of the Arctic Ocean from Nd‐Sr isotopes in fossil fish debris, Lomonosov Ridge

et al. 2009

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[1] Strontium and neodymium radiogenic isotope ratios in early to middle Eocene fossil fish debris (ichthyoliths) from Lomonosov Ridge (Integrated Ocean Drilling Program Expedition 302) help constrain water mass compositions in the Eocene Arctic Ocean between $55 and $45 Ma. The inferred paleodepositional setting was a shallow, offshore marine to marginal marine environment with limited connections to surrounding ocean basins. The new data demonstrate that sources of Nd and Sr in fish debris were distinct from each other, consistent with a salinity-stratified water column above Lomonosov Ridge in the Eocene. The

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Section: Discussionsupporting

confidence: 83%

Early to middle Eocene history of the Arctic Ocean from Nd‐Sr isotopes in fossil fish debris, Lomonosov Ridge

et al. 2009

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“…The high North Atlantic location and fortuitous combination of abundant and diverse calcitic, siliceous and organic-walled microfossils make Hole 647A a strategic site for linking the virtually carbonate-free, very high northern latitude Palaeogene sediments of the Arctic Ocean (e.g. Clark 1974;Kitchel & Clark 1982;Bukry 1984;Mudie 1985;Mudie et al 1986;Dell-Agnese & Clark 1994;Magavern et al 1996;Backman et al 2008;Sangiorgi et al 2008;St. John 2008;Stickley et al 2009;Suto et al 2009) and of the Norwegian-Greenland Sea (N -G Sea; e.g.…”

Section: Site 647 Microfossils and Existing Chronologymentioning

confidence: 99%

Integrated biomagnetochronology for the Palaeogene of ODP Hole 647A: implications for correlating palaeoceanographic events from high to low latitudes

Firth

Eldrett

Harding

et al. 2012

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Lower Eocene to Oligocene microfossil-rich hemipelagic sediments in ODP Hole 647A, southern Labrador Sea, provide a strategic section for resolving the early history of high North Atlantic climates and ocean circulation, and for correlating with carbonate-poor lower Cenozoic sediments in the Arctic and Nordic seas. Our new, integrated palaeomagneto-and multigroup biostratigraphy (63 dinoflagellate cyst, calcareous nannofossil, planktonic foraminifer and diatom datums) significantly improves Site 647 chronostratigraphy and provides a framework for future studies. This new age model, coupled with provisional d 18 O analyses, provides greater confidence in the location of significant ocean-climate events at this site, including the Eocene-Oligocene transition and the Middle Eocene Climatic Optimum. Early Eocene hyperthermals may also be present near the base of the section. Palaeomagnetic age control is significantly improved in the Eocene, but not in the Oligocene. Revised estimates of sedimentation and biogenic flux indicate changes in supply and preservation that may be climatically controlled. A Lower to Middle Eocene hiatus is more precisely constrained, with a c. 4 million year duration. Age and depth errors quantify the age uncertainties throughout the section. Our revised age model will play an important role in stratigraphic correlation between very high latitude and lower latitude sites. Supplementary material: All tables with ages and age-derived calculations based on the Gradstein et al. (2004) timescale used herein are reproduced as supplementary tables using both the Gradstein et al. (2004) and the Cande & Kent (1995) timescales (Tables DS1-DS6). Discrete sample and shipboard pass-through cryomagnetometer palaeomagnetic data, planktonic foraminifer and fine fraction (,20 mm) stable isotope data, raw and processed core GRA density data, and specifications and results of GRA density spectral analyses are also provided as supplementary tables (Tables DS7-DS11). These tables are available at www.geolsoc.org.uk/SUP18546. Downloaded from J. V. FIRTH ET AL. J. V. FIRTH ET AL. J. V. FIRTH ET AL. } HO Nannotetrina spp.; LO of D. hesslandii (equivalent to R. bisecta). 1 HO Nannotetrina fulgens. 2 LO R. bisecta between top and base of C18r.

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“…As suggested by the taxonomic composition of fossil diatom flora , the Horton River section in the Northwest Territories is inferred to have been located further out on the shelf at the time of deposition, closer to a connection with the Western Interior Seaway (Magavern et al, 1996;Jenkyns et al, 2004;Davies et al, 2009). Other localities investigated by were located at inner shelf settings, similar to the sections on Devon Island.…”

Section: Paleogeographic Setting and Paleoecologymentioning

confidence: 99%

“…In terms of paleogeography, the Late Cretaceous Arctic Ocean was largely isolated by surrounding land masses, but paleobiogeographic evidence (including distributions of diatoms) indicates the existence of shallow marine connections between lower latitude waters and the otherwise land-locked Arctic Ocean, through the Western Interior Seaway and Turgai Strait (Magavern et al, 1996;Baraboshkin et al, 2003).…”

Section: Cretaceous Arcticmentioning

confidence: 99%

“…In the Late Cretaceous, the Arctic Ocean apparently shared only shallow water connections with water bodies to the south (Magavern et al, 1996;Baraboshkin et al, 2003), and the coast was located south of the localities discussed in this paper (Núñez-Betelu et al, 1995a;Falcon-Lang et al, 2004). As suggested by the taxonomic composition of fossil diatom flora , the Horton River section in the Northwest Territories is inferred to have been located further out on the shelf at the time of deposition, closer to a connection with the Western Interior Seaway (Magavern et al, 1996;Jenkyns et al, 2004;Davies et al, 2009).…”

Section: Paleogeographic Setting and Paleoecologymentioning

confidence: 99%

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Taxonomic composition, paleoecology and biostratigraphy of Late Cretaceous diatoms from Devon Island, Nunavut, Canadian High Arctic

Witkowski

Harwood

Chin

2011

Cretaceous Research

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, phytoplankton, and the nature of the Late Cretaceous and early Cenozoic Arctic Ocean

Cited by 13 publications

References 29 publications

Early to middle Eocene history of the Arctic Ocean from Nd‐Sr isotopes in fossil fish debris, Lomonosov Ridge

Early to middle Eocene history of the Arctic Ocean from Nd‐Sr isotopes in fossil fish debris, Lomonosov Ridge

Integrated biomagnetochronology for the Palaeogene of ODP Hole 647A: implications for correlating palaeoceanographic events from high to low latitudes

Taxonomic composition, paleoecology and biostratigraphy of Late Cretaceous diatoms from Devon Island, Nunavut, Canadian High Arctic

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