Article (Scientific journals)
Deep circulation changes in the Labrador sea since the last glacial maximum: New constraints from Sm-Nd data on sediments
Fagel, Nathalie; Innocent, C.; Stevenson, R. K. et al.
1999In Paleoceanography, 14 (6), p. 777-788
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Keywords :
Sm/Nd; isotope; sediment; Labrador; deep circulation
Abstract :
[en] Sm-Nd concentrations and Nd isotopes were investigated in the fine fraction of two Labrador Sea cores to reconstruct the deep circulation patterns through changes in sedimentary supply since the last glacial stage. Three sources are involved: the North American Shield, Palaeozoic rocks from northeastern Greenland, and 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 setup 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, and 9.2 kyr ago.
Research center :
GEOTOP
Disciplines :
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Earth sciences & physical geography
Author, co-author :
Fagel, Nathalie  ;  Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Innocent, C.
Stevenson, R. K.
Hillaire-Marcel, C.
Language :
English
Title :
Deep circulation changes in the Labrador sea since the last glacial maximum: New constraints from Sm-Nd data on sediments
Publication date :
1999
Journal title :
Paleoceanography
ISSN :
0883-8305
eISSN :
1944-9186
Publisher :
American Geophysical Union, Washington, United States - District of Columbia
Volume :
14
Issue :
6
Pages :
777-788
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
CRSNG - Conseil de Recherches en Sciences naturelles et en Génie [CA]
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