Postglacial Isobases from Northern Ellesmere Island and Greenland: New Data

Author:

England John,Bednarski Jan

Abstract

Over seventy new 14C dates on former relative sea levels from Hall Land, northwest Greenland, and Clements Markham Inlet, northern Ellesmere Island, are combined with previous data to revise the regional isobases for this area. These isobases show : 1) a centre of maximum postglacial emergence over northwest Greenland extending to; 2) an intervening cell of lower emergence over northeast Ellesmere Island which was isostatically-dominated by the Greenland Ice Sheet; in turn, extending to 3) a higher centre of emergence over the Grant Land Mountains, northernmost Ellesmere Island, associated with the independent history of local ice caps there. Radiocarbon dates from raised marine shorelines show a 2000 year lag between glacial unloading on northwest Greenland and northernmost Ellesmere Island. This lag in glacioisostatic adjustments suggests a considerable range in the glacier response times and/or glacioclimatic regimes in this area. Throughout the area the last ice limit was ca. 5-60 km beyond present ice margins. Maximum emergence at these ice limits is marked by shorelines built into a full glacial sea which range from 124 m asl in Clements Markham Inlet to 150 m asl in Hall Land. This indicates that similar emergence (120-150 m) in other areas does not necessarily require the removal of entire ice sheets although this has been commonly assumed in the literature. The geophysical implications of this warrant consideration.

Publisher

Consortium Erudit

Subject

Paleontology,Geology

Reference26 articles.

1. ANDREWS, J. T. (1968) : Pattern and cause of variability of postglacial uplift and rate of uplift in arctic Canada, Journal of Geology, 76, p. 404-425.

2. ANDREWS, J. T. (1970) : A geomorphic study of postglacial uplift with particular reference to arctic Canada, Institute of British Geographers, London, England, Special Publication, 2, 156 p.

3. BEDNARSKI, J. (1984) : Glacier fluctuations and sea level history of Clements Markham Inlet, northern Ellesmere Island, Ph.D. thesis, The University of Alberta, Edmonton, Alberta, 232 p.

4. BEDNARSKI, J. (1986) : Late Quaternary glacial and sea level events, Clements Markham Inlet, Northern Ellesmere Island, Arctic Canada, Canadian Journal of Earth Sciences, 23, p. 1343-1355.

5. BLAKE, W., Jr. (1970): Studies of glacial history in arctic Canada. I. Pumice, radiocarbon dates, and differential postglacial uplift in the eastern Queen Elizabeth Islands, Canadian Journal of Earth Sciences, 7, p. 634-664.

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