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.; Hillaire-Marcel, C.

doi:10.1029/1999PA900041

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.

1999 • In Paleoceanography, 14 (6), p. 777-788

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10.1029/1999PA900041

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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/Unit :

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 :

Issue :

Pages :

777-788

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

CRSNG - Conseil de Recherches en Sciences naturelles et en Génie

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