Open Marien Archief | Vlaams Instituut voor de Zee

Vlaams Instituut voor de Zee

Platform voor marien onderzoek

In:

Open Marien Archief

Het Open Marien Archief van België (OMA) biedt vrije toegang tot de digitale publicaties over de Vlaamse kust en het Belgisch deel van de Noordzee, en alle andere mariene, estuariene en kustgebonden publicaties van Belgische auteurs en wetenschappers en van buitenlandse wetenschappers geaffilieerd aan een Belgische instelling.

Meer info

Nieuwe zoekopdracht
[ meld een fout in dit record ]mandje (1): toevoegen | toon Print-vriendelijke versie

one publication added to basket [202257]
Ice-rafting from the British-Irish ice sheet since the earliest Pleistocene (2.6 million years ago): implications for long-term mid-latitudinal ice-sheet growth in the North Atlantic region
Thierens, M.; Pirlet, H.; Colin, C.; Latruwe, K.; Vanhaecke, F.; Lee, J.R.; Stuut, J.-B.; Titschaeck, J.; Titschack, J.; Huvenne, V.; Dorschel, B.; Wheeler, A.J.; Henriet, J.P. (2012). Ice-rafting from the British-Irish ice sheet since the earliest Pleistocene (2.6 million years ago): implications for long-term mid-latitudinal ice-sheet growth in the North Atlantic region. Quat. Sci. Rev. 44: 229-240. dx.doi.org/10.1016/j.quascirev.2010.12.020
In: Quaternary Science Reviews. Pergamon Press: Oxford. ISSN 0277-3791, meer
Peer reviewed article

Beschikbaar in Auteurs 

Trefwoorden
    Glaciation; Ice sheets; Ice-rafted detritus; Ijskappen; Isotopen; Pleistoceen; AN, North Atlantic [Marine Regions]; Marien
Author keywords
    British-Irish Ice Sheet; Ice-rafted detritus (IRD); NE Atlantic;Pleistocene; Glaciation; Nd-Sr isotopes

Auteurs  Top 
  • Thierens, M.
  • Pirlet, H., meer
  • Colin, C.
  • Latruwe, K.
  • Vanhaecke, F.
  • Lee, J.R.
  • Stuut, J.-B., meer
  • Titschaeck, J.
  • Titschack, J.
  • Huvenne, V., meer
  • Dorschel, B.
  • Wheeler, A.J.
  • Henriet, J.P., meer

Abstract
    The Plio-Pleistocene intensification of Northern Hemisphere continental ice-sheet development is known to have profoundly affected the global climate system. Evidence for early continental glaciation is preserved in sediments throughout the North Atlantic Ocean, where ice-rafted detritus (IRD) layers attest to the calving of sediment-loaded icebergs from circum-Atlantic ice sheets. So far, Early-Pleistocene IRD deposition has been attributed to the presence of high-latitudinal ice sheets, whereas the existence and extent of ice accumulation in more temperate, mid-latitudinal regions remains enigmatic.

    Here we present results from the multiproxy provenance analysis of a unique, Pleistocene-Holocene IRD sequence from the Irish NE Atlantic continental margin. There, the Challenger coral carbonate mound (IODP Expedition 307 site U1317) preserved an Early-Pleistocene record of 16 distinctive IRD events, deposited between ca 2.6 and 1.7 Ma. Strong and complex IRD signals are also identified during the mid-Pleistocene climate transition (ca 1.2 to 0.65 Ma) and throughout the Middle-Late Pleistocene interval. Radiogenic isotope source-fingerprinting, in combination with coarse lithic component analysis, indicates a dominant sediment source in the nearby British–Irish Isles, even for the oldest, Early-Pleistocene IRD deposits. Hence, our findings demonstrate, for the first time, repeated and substantial (i.e. marine-terminating) ice accumulation on the British–Irish Isles since the beginning of the Pleistocene. Contemporaneous expansion of both high- and mid-latitudinal ice sheets in the North Atlantic region is therefore implied at the onset of the Pleistocene. Moreover, it suggests the recurrent establishment of (climatically) favourable conditions for ice sheet inception, growth and instability in mid-latitudinal regions, even in the earliest stages of Northern Hemisphere glacial expansion and in an obliquity-driven climate system.


 Top | Auteurs