TY  - JOUR
  - M. Thierens, H. Pirlet, C. Colin, K. Latruwe, F. Vanhaecke, J.R. Lee, J.-B. Stuut, J. Titschack, V.A.I. Huvenne, B. Dorschel, A.J. Wheeler, J.-P., Henriet
  - 2012
  - Quaternary Science Reviews
  - 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
  - Published
  - ()
  - 44
  - 229
  - 240
  - The Plio-Pleistocene intensification of Northern Hemisphere continental ice-sheet development isknown to have profoundly affected the global climate system. Evidence for early continental glaciation ispreserved in sediments throughout the North Atlantic Ocean, where ice-rafted detritus (IRD) layers attestto the calving of sediment-loaded icebergs from circum-Atlantic ice sheets. So far, Early-Pleistocene IRDdeposition has been attributed to the presence of high-latitudinal ice sheets, whereas the existence andextent of ice accumulation in more temperate, mid-latitudinal regions remains enigmatic.Here we present results from the multiproxy provenance analysis of a unique, Pleistocene-HoloceneIRD sequence from the Irish NE Atlantic continental margin. There, the Challenger coral carbonatemound (IODP Expedition 307 site U1317) preserved an Early-Pleistocene record of 16 distinctive IRDevents, deposited between ca 2.6 and 1.7 Ma. Strong and complex IRD signals are also identified duringthe mid-Pleistocene climate transition (ca 1.2 to 0.65 Ma) and throughout the Middle-Late Pleistoceneinterval. Radiogenic isotope source-fingerprinting, in combination with coarse lithic component analysis,indicates a dominant sediment source in the nearby BritisheIrish 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 BritisheIrish Isles since the beginning of the Pleistocene.Contemporaneous expansion of both high- and mid-latitudinal ice sheets in the North Atlanticregion is therefore implied at the onset of the Pleistocene. Moreover, it suggests the recurrent establishmentof (climatically) favourable conditions for ice sheet inception, growth and instability in midlatitudinalregions, even in the earliest stages of Northern Hemisphere glacial expansion and in anobliquity-driven climate system.
DA  - 2012/NaN
ER  - 

@article{V115754649,
   = {M. Thierens,  H. Pirlet and  C. Colin,  K. Latruwe and  F. Vanhaecke,  J.R. Lee and  J.-B. Stuut,  J. Titschack and  V.A.I. Huvenne,  B. Dorschel and  A.J. Wheeler,  J.-P. and  Henriet },
   = {2012},
   = {Quaternary Science Reviews},
   = {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},
   = {Published},
   = {()},
   = {44},
  pages = {229--240},
   = {{The Plio-Pleistocene intensification of Northern Hemisphere continental ice-sheet development isknown to have profoundly affected the global climate system. Evidence for early continental glaciation ispreserved in sediments throughout the North Atlantic Ocean, where ice-rafted detritus (IRD) layers attestto the calving of sediment-loaded icebergs from circum-Atlantic ice sheets. So far, Early-Pleistocene IRDdeposition has been attributed to the presence of high-latitudinal ice sheets, whereas the existence andextent of ice accumulation in more temperate, mid-latitudinal regions remains enigmatic.Here we present results from the multiproxy provenance analysis of a unique, Pleistocene-HoloceneIRD sequence from the Irish NE Atlantic continental margin. There, the Challenger coral carbonatemound (IODP Expedition 307 site U1317) preserved an Early-Pleistocene record of 16 distinctive IRDevents, deposited between ca 2.6 and 1.7 Ma. Strong and complex IRD signals are also identified duringthe mid-Pleistocene climate transition (ca 1.2 to 0.65 Ma) and throughout the Middle-Late Pleistoceneinterval. Radiogenic isotope source-fingerprinting, in combination with coarse lithic component analysis,indicates a dominant sediment source in the nearby BritisheIrish 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 BritisheIrish Isles since the beginning of the Pleistocene.Contemporaneous expansion of both high- and mid-latitudinal ice sheets in the North Atlanticregion is therefore implied at the onset of the Pleistocene. Moreover, it suggests the recurrent establishmentof (climatically) favourable conditions for ice sheet inception, growth and instability in midlatitudinalregions, even in the earliest stages of Northern Hemisphere glacial expansion and in anobliquity-driven climate system.}},
  source = {IRIS}
}