Analysis of Strandline Tilt Directions in Relation to Ice Centers and Postglacial Crustal Deformation, Laurentide Ice Sheet

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Abstract
Tilt directions on former water planes (marine and glacial lake) for 36 sites within the area of the former Laurentide Ice Sheet are projected toward the geometrical center of the ice sheet. Six zones are indicated on the basis of tilt intersections; of these, at least five have been considered as glacial dispersal centers at one time or another. The six zones are: Central Hudson Bay, southeastern Hudson Bay/James Bay, central Labrador-Ungava, northwest Hudson Bay, east of Great Slave Lake, and between the St. Lawrence and James Bay. All have geographical proximity to lows on the Free Air gravity anomaly map, but only two are indicated on current maps of postglacial uplift and rates of recovery. Late-glacial movement of ice centers might cause the migration of the loci of postglacial uplift; there is some evidence for such events but more information is required. The areas of tilt intersections form a broad U around Hudson Bay with one in the center. The U follows the present height of land and could reflect the Laurentide ice divide at its maximum stage. In this interpretation the maximum and late-glacial ice divides are not geographically displaced.

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