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  • 2010-2014  (3)
  • 2014  (3)
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  • 2010-2014  (3)
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  • 1
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    Palynological analyses of the sediments around the Miocene/Pliocene boundary in ODP Hole 151-911A (2014)
    PANGAEA
    In:  Supplement to: Grøsfjeld, Kari; De Schepper, Stijn; Fabian, Karl; Husum, Katrine; Baranwal, Soma; Andreassen, Karin; Knies, Jochen (2014): Dating and palaeoenvironmental reconstruction of the sediments around the Miocene/Pliocene boundary in Yermak Plateau ODP Hole 911A using marine palynology. Palaeogeography, Palaeoclimatology, Palaeoecology, 414, 382-402, https://doi.org/10.1016/j.palaeo.2014.08.028
    Details
    Publication Date: 2024-01-09
    Description: The late Neogene evolution of the Arctic to Subarctic region is poorly understood due to few available records and poor age control. At the margin of the Arctic Ocean, Yermak Plateau Ocean Drilling Program (ODP) Hole 911A is strategically located for establishing a stratigraphic framework for the Arctic. Here we present dinoflagellate cyst and acritarch data from 24 stratigraphic levels in the lower part (474.26-505.64 metres below the seafloor (mbsf)) of ODP Hole 911A. The marine palynomorphs indicate a latest Miocene to earliest Pliocene age (between 5.8 and 5.0 Ma) for the base of the hole based on the co-occurrence of the dinoflagellate cyst Barssidinium evangelineae and acritarch Lavradosphaera crista. Our age estimate for the sediments can possibly be further refined to 5.0-5.33 Ma based on the presence of Achomosphaera andalousiensis suttonensis, which apparently has a range restricted to the Pliocene. An age close to the Miocene/Pliocene boundary agrees with the planktonic foraminifer data. Together with recently available magnetostratigraphic data, the base of the hole is likely to be placed at ~5.2 Ma. This new chronostratigraphy is a first step towards a better understanding of the late Neogene palaeoenvironment for the Yermak Plateau and also for the wider Arctic to Subarctic region. The terrestrial and fresh water palynomorphs were most likely redistributed and/or displaced from the shelf towards deeper parts of the basin during contourite deposition under the influence of the West Spitsbergen Current. The in situ marine dinoflagellate cyst assemblage contains a mixture of cool water and thermophilic taxa, indicating sea-ice free, cool-temperate, warmer than present conditions at the Yermak Plateau. Rivers were likely the source for the freshwater influence.
    Keywords: 151-911A; Achomosphaera andalousiensis andalousiensis; Achomosphaera andalousiensis suttonensis; Acritarcha; Acritarcha, standard error; Acritarcha indeterminata; Acritarcha per unit mass; Amiculosphaera umbraculum; Barssidinium evangelineae; Barssidinium graminosum; Barssidinium pliocenicum; Barssidinium spp.; Bitectatodinium raedwaldii; Bitectatodinium tepikiense; Botryococcus spp.; Brigantedinium spp.; Cymatiosphaera invaginata; Cymatiosphaera spp.; DEPTH, sediment/rock; Dinoflagellate cyst; Dinoflagellate cyst, standard error; Dinoflagellate cyst indeterminata; Dinoflagellate cyst per unit mass; Dinoflagellate cyst reworked; Dinoflagellate cyst reworked, standard error; Dinoflagellate cyst reworked per unit mass; DRILL; Drilling/drill rig; Dry mass; DSDP/ODP/IODP sample designation; Echinidinium euaxum; Filisphaera filifera; Filisphaera microornata; Foraminifera, linings; Habibacysta tectata; Impagidinium aculeatum; Impagidinium pallidum; Impagidinium patulum; Impagidinium sp.; Impagidinium spp.; Invertocysta lacrymosa; Invertocysta tabulata; Joides Resolution; Laboratory code/label; Lavradosphaera crista; Lavradosphaera lucifer; Leg151; Lejeunecysta mariae; Lejeunecysta spp.; Lingulodinium machaerophorum; Lycopodium clavatum, standard deviation; Lycopodium clavatum markers counted; Lycopodium clavatum spores per tablet; Lycopodium tablets; Nematosphaeropsis labyrinthus; North Greenland Sea; Number of taxa; Ocean Drilling Program; ODP; Operculodinium? eirikianum crebrum; Operculodinium? eirikianum eirikianum; Operculodinium centrocarpum; Operculodinium sp.; Pediastrum spp.; Pentapharsodinium dalei; Protoceratium reticulatum; Sample code/label; Selenopemphix dionaeacysta; Spiniferites elongatus; Spiniferites falcipedius; Spiniferites spp.; Sumatradinium sp.; Tasmanites; Trinovantedinium glorianum; Trinovantedinium variabile
    Type: Dataset
    Format: text/tab-separated-values, 1521 data points
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    DATA PANGAEA
  • 2
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    Effect of early Pliocene uplift on late Pliocene cooling in the Arctic–Atlantic gateway (2014)
    In:  EPIC3Earth and Planetary Science Letters, 387, pp. 132-144, ISSN: 0012-821X
    Details
    Publication Date: 2015-10-03
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 3
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    Arctic Ocean glacial history (2014)
    PERGAMON-ELSEVIER SCIENCE LTD
    In:  EPIC3Quaternary Science Reviews, PERGAMON-ELSEVIER SCIENCE LTD, 92, pp. 40-67, ISSN: 0277-3791
    Details
    Publication Date: 2016-02-02
    Description: While there are numerous hypotheses concerning glacialeinterglacial environmental and climatic regime shifts in the Arctic Ocean, a holistic view on the Northern Hemisphere’s late Quaternary ice-sheet extent and their impact on ocean and sea-ice dynamics remains to be established. Here we aim to provide a step in this direction by presenting an overview of Arctic Ocean glacial history, based on the present state-of-the-art knowledge gained from field work and chronological studies, and with a specific focus on ice-sheet extent and environmental conditions during the Last Glacial Maximum (LGM). The maximum Quaternary extension of ice sheets is discussed and compared to LGM. We bring together recent results from the circum-Arctic continental margins and the deep central basin; extent of ice sheets and ice streams bordering the Arctic Ocean as well as evidence for ice shelves extending into the central deep basin. Discrepancies between new results and published LGM ice-sheet reconstructions in the high Arctic are highlighted and outstanding questions are identified. Finally, we address the ability to simulate the Arctic Ocean ice sheet complexes and their dynamics, including ice streams and ice shelves, using presently available ice-sheet models. Our review shows that while we are able to firmly reject some of the earlier hypotheses formulated to describe Arctic Ocean glacial conditions, we still lack information from key areas to compile the holistic Arctic Ocean glacial history.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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    PAPER (OA)
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