In:
Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 100, No. C4 ( 1995-04-15), p. 7019-7025
Abstract:
A better knowledge of boundary conditions near a grounding line is critical for understanding the behavior of ice shelves and floating glaciers. We show here thatsignificant information can be gained from a high‐resolution isotopic and textural studyof marine ice accreted at the bottom of a floating glacier near its grounding line. Two different types of marine ice have been found. Type 1 is bubble‐and debris‐free icewith properties which, we believe, can be explained by intrusion of brackish water inopen basal fissures. Closing of the fissures by progression of a freezing front from thesides is precluded, and filling by frazil ice is favored. Type 2 is made of thin, clear iceand debris layers which are thought to have formed when a subglacial water‐filledsediment enters into contact with seawater and is subjected to freezing under a double‐diffusion process. The paper also stresses that in a δD‐δ 18 O diagram the alignment of marine ice samples on a mixing line does not necessarily imply a mixture of continental water and seawater in varying proportions.
Type of Medium:
Online Resource
ISSN:
0148-0227
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1995
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