CGRG Bibliography of Canadian Geomorphology
Search Results
Author : Gray, J.T.
Date : 2001.
Title : Patterns of ice flow and deglaciation chronology for southern coastal margins of Hudson Strait and Ungava Bay.
Publication : Marine geology of Hudson Strait and Ungava Bay, Eastern Arctic Canada: Late Quaternary sediments, depositional environments, and late glacial-deglacial history derived from marine and terrestrial studies. Edited by B. Maclean; Geological Survey of Canada, Bulletin
Issue : 566:
Page(s) : 31-55.
Abstract
Erosional features, erratic occurrences, and carbonate drift distribution on the southern margins of Hudson Strait revealed divergent flow from northern Ungava Peninsula into west-central Hudson Strait, and convergent flow from southern Ungava Peninsula, central Quebec-Labrador, and Torngat Mountains dispersal centres into Ungava Bay. Convergence of ice flows from Hudson Strait and Ungava Bay is suggested by easterly flow overriding the northern Labrador peninsula. In west-central Hudson Strait, only islands and promontories were affected by a Hudson Strait ice stream, that later gave way to northeasterly flow off Ungava Peninsula. Ice retreat in the Torngat Mountains of northern Labrador was succeeded by invasion of easterly flowing and coalescent Ungava Bay and Hudson Strait ice, resulting in the north-trending Sheppard Lake moraines, and glacially dammed lakes farther south. Carbon 14 mollusc dates from Deception Bay indicate an ephemeral opening of Hudson Strait prior to 10 ka BP, but general deglaciation of east-central Hudson Strait occurred at ca. 9 ka BP, with Ungava Bay finally free from ice after 7 ka BP. Late easterly flows across Akpatok Island and 14C ages cannot be easily reconciled with late glacial resurgence of ice northward from Quebec-Labrador across an ice-free Hudson Strait to Noble Inlet on south Baffin Island.
Bibliography of Canadian Geomorphology