10Be data from meltwater channels suggest that Jameson Land, east Greenland, was ice-covered during the last glacial maximum

Lena Håkansson, Jason P. Briner, Ala Aldahan, Göran Possnert

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Along the northeast Greenland continental margin, bedrock on interfjord plateaus is highly weathered, whereas rock surfaces in fjord troughs are characterized by glacial scour. Based on the intense bedrock weathering and lack of glacial deposits from the last glaciation, interfjord plateaus have long been thought to be ice-free throughout the last glacial maximum (LGM). In recent years there is growing evidence from shelf and fjord settings that the northeast Greenland continental margin was more extensively glaciated during the LGM than previously thought. However, little is still known from interfjord settings. We present cosmogenic 10Be data from meltwater channels and weathered sandstone outcrops on Jameson Land, an interfjord highland north of Scoresby Sund. The mean exposure age of samples from channel beds (n=3) constrains on the onset of deglaciation on interior Jameson Land to 18.5±1.3-21.4±1.9ka (for erosion conditions of 0-10mm/ka, respectively). This finding adds to growing evidence that the northeast Greenland continental margin was more heavily glaciated during the LGM than previously thought.

Original languageEnglish
Pages (from-to)452-459
Number of pages8
JournalQuaternary Research
Volume76
Issue number3
DOIs
Publication statusPublished - Nov 2011

Keywords

  • Cosmogenic isotopes
  • Glaciation
  • Greenland
  • Jameson Land
  • Last glacial maximum
  • Meltwater channels
  • Sandstone
  • Weathering

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Earth-Surface Processes
  • General Earth and Planetary Sciences

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