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A stacked mixing sequence at the base of the Dye 3 Core, Greenland
Author(s) -
Souchez R.,
Bouzette A.,
Clausen H. B.,
Johnsen S. J.,
Jouzel J.
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl01411
Subject(s) - geology , bedrock , entrainment (biomusicology) , mixing (physics) , geomorphology , ice core , ice stream , ice sheet , greenland ice sheet , core (optical fiber) , mineralogy , oceanography , sea ice , cryosphere , materials science , physics , quantum mechanics , rhythm , composite material , aesthetics , philosophy
This paper documents, by a detailed isotopic and gas composition study of the basal ice from the Dye 3 core, a large degree of flow‐induced mixing at the ice sheet base. This mixing results most probably from circular motion in troughs of bedrock undulations and flow separations with some entrainment of the underlying ice. The measured distribution of isotopes and gases in the basal ice is the consequence of successive mixing events having occurred upglacier from the site in an area of very rough bedrock topography. The deformation produced makes it possible for the basal part of the ice sheet to cross the subglacial valley existing in the Dye 3 area.