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Testing the stratigraphic consistency of Pleistocene microfossil bioevents identified on the Alpha and Lomonosov Ridges, Arctic Ocean
Stockholms universitet, Institutionen för geologiska vetenskaper.ORCID iD: 0000-0003-0276-1973
Stockholms universitet, Institutionen för geologiska vetenskaper.ORCID iD: 0000-0002-6046-1488
Stockholms universitet, Institutionen för geologiska vetenskaper.ORCID iD: 0000-0002-6458-6245
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Number of Authors: 5
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2021 (English)In: Arctic, Antarctic and Alpine research, ISSN 1523-0430, E-ISSN 1938-4246, Vol. 53, no 1, p. 309-323Article in journal (Refereed) Published
Abstract [en]

Two different biostratigraphic approaches are used to identify Marine Isotope Stage 11 (MIS 11) in Arctic Ocean sediments. On the Lomonosov Ridge, globally calibrated nannofossil bioevents constrain the age of sediments back to MIS 13 (Core LOMROG12-3PC). In the Amerasian Basin the unique occurrence of the planktonic foraminifer Turborotalita egelida is increasingly used as a marker for MIS 11. However, the T. egelida horizon has only been dated using cyclostratigraphy. Here we bridge these approaches through investigation of a new core (AO16-8GC) from the Alpha Ridge, Amerasian Basin. AO16-8GC is easily correlated to LOMROG12-3PC and contains the T. egelida horizon, allowing the first comparison between the biostratigraphy of both regions. Based on the nannofossil biochronology of LOMROG12-3PC, the most convincing lithologic correlation between the Alpha and Lomonosov Ridge cores places the T. egelida horizon between MIS 15 and MIS 17. This potentially older age for the T. egelida biohorizon emphasizes the need for continued caution in interpreting paleoceanographic records predating MIS 6, until further work can reconcile the nanno- and microfossil biostratigraphies that are emerging for middle Pleistocene sediments of the central Arctic Ocean.

Place, publisher, year, edition, pages
2021. Vol. 53, no 1, p. 309-323
Keywords [en]
Arctic, biostratigraphy, foraminifera, geochronology, paleoceanography
National Category
Earth and Related Environmental Sciences
Research subject
SWEDARCTIC 2016, Arctic Ocean 2016
Identifiers
URN: urn:nbn:se:polar:diva-8878DOI: 10.1080/15230430.2021.1988356ISI: 000724552300001OAI: oai:DiVA.org:polar-8878DiVA, id: diva2:1629915
Available from: 2021-12-13 Created: 2022-01-19Bibliographically approved

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Vermassen, FlorO'Regan, MattWest, GabrielCoxall, Helen K.
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