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Color and lithological description of sediment core PS1497-1

Publication Date
DOI: 10.1594/pangaea.228641
  • Ant-V/4
  • Awi_Paleo
  • Color Code Hls-System
  • Depth
  • Bottom/Max
  • Depth
  • Top/Min
  • Filchner Trough
  • Giant Box Corer
  • Lithology/Composition/Facies
  • Munsell Color System (1994)
  • Paleoenvironmental Reconstructions From Marine Sediments @ Awi
  • Polarstern
  • Ps10
  • Ps10/768
  • Ps1497-1
  • Visual Description
  • Archaeology
  • Biology
  • Earth Science
  • Ecology
  • Geography


THE ANTARCTIC PALEOENVIRONMENT: A PERSPECTIVE ON GLOBAL CHANGE , - ANTARCTIC RESEARCH SERIES, VOLUME 56, PAGES 349-376 LATE QUATERNARY CLIMATIC CYCLES AS RECORDED IN SEDIMENTS FROM THE ANTARCTIC CONTINENTAL MARGIN HANNES GROBE AND ANDREAS MACKENSEN Alfred Wegener Institute for Polar and Marine Research, D-2850 Bremerhaven, Germany To reveal the late Quaternary paleoenvironmental changes at the Antarctic continental margin, we test a lithostratigraphy adjusted to a stable isotope record from the eastern Weddell Sea. The stratigraphy is used to produce a stacked sedimentological data Set of 11 sediment cores. We derive a general model of glaciomarine sedimentation and paleoenvironmental changes at the East Antarctic continental margin during the last two climatic cycles (300 kyr). The sedimentary processes considered include biological productivity, ice rafting, current transport, and gravitational downslope transport. These processes are controlled by a complex interaction of sea level changes and paleoceanographic and paleoglacial conditions in response to changes of global climate and local insolation. Sedimenta- tion rates are mainly controlled by ice rafting which reflects mass balance and behavior of the Antarctic ice sheet. The sedimentation rates decrease with distance from the continent and from interglacial to glacial. Highest rates occur at the very beginning of interglacials, i.e., of oxygen isotope events 7.5, 5.5, and 1.1, these being up to 5 times higher than those during glacials. The sediments can be classified into five distinct facies and correlated to different paleoenvironments: at glacial. terminations (isotope events 8.0, 6.0, and 2.0), the Antarctic cryosphere adjusts to new climatic conditions. The sedimentary processes are controlled by the rise of sea level, the destruction of ice shelves, the retreat of sea ice, and the recommenced feeding of warm North Atlantic Deep Water (NADW) to the Circumpolar Deep Water (CDW). During peak wa

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