CGRG Bibliography of Canadian Geomorphology
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Author : Fagel, N.; Innocent, C.; Stevenson, R.K.; and Hillaire-Marcel, C.
Date : 1999.
Title : Deep circulation changes in the Labrador Sea since the last glacial maximum: new constraints from Sm-Nd data on sediments.
Publication : Paleoceanography
Issue : 14(6):
Page(s) : 776-788.
Abstract
Sm-Nd concentrations and Nd isotopes were investigated in the fine fraction of two Labrador Sea cores to reconstruct deep circulation pattern through changes in sedimentary supply since the last glacial stage. Three sources are involved: the North American Shield, the Palaeozoic rocks from northeastern Greenland and the Mid-Atlantic volcanism. The variable input of these sources provides constraints on the relative sedimentary supply, in conjunction with inception of deep currents. During the last glacial stage, a persistent but sluggish current occurred inside the Labrador Basin. An increasing discharge of volcanic material driven by the North East Atlantic Deep Water is documented since 14.3 kyr, signaling the set-up of a modern-like deep circulation pattern throughout the Labrador, Irminger and Iceland basins. During the last deglacial stage, the isotopic record was punctually influenced by erosion processes related mainly to ice-sheet instabilities, especially 11.4, 10.2 a nd 9.2 kyr ago.
Bibliography of Canadian Geomorphology