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    Widespread Antarctic glaciation during the Late Eocene

    Carter, Andrew and Riley, T. and Hillenbrand, C.-D. and Rittner, M. (2016) Widespread Antarctic glaciation during the Late Eocene. Earth & Planetary Science Letters , ISSN 0012-821X.

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    Abstract

    Marine sedimentary rocks drilled on the southeastern margin of the South Orkney microcontinent in Antarctica (Ocean Drilling Program Leg 113 Site 696) were deposited between ∼36.5Ma to 33.6Ma, across the Eocene–Oligocene climate transition. The recovered rocks contain abundant grains exhibiting mechanical features diagnostic of iceberg-rafted debris. Sand provenance based on a multi-proxy approach that included petrographic analysis of over 275,000 grains, detrital zircon geochronology and apatite thermochronometry rule out local sources (Antarctic Peninsula or the South Orkney Islands) for the material. Instead the ice-transported grains show a clear provenance from the southern Weddell Sea region, extending from the Ellsworth–Whitmore Mountains of West Antarctica to the coastal region of Dronning Maud Land in East Antarctica. This study provides the first evidence for a continuity of widespread glacier calving along the coastline of the southern Weddell Sea embayment at least 2.5million yrs before the prominent oxygen isotope event at 34–33.5Ma that is considered to mark the onset of widespread glaciation of the Antarctic continent.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): Eocene–Oligocene transition, Antarctica, glaciation, IRD, provenance
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Depositing User: Professor Andrew Carter
    Date Deposited: 30 Nov 2016 16:24
    Last Modified: 30 Nov 2016 16:24
    URI: http://eprints.bbk.ac.uk/id/eprint/16774

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