Article (Scientific journals)
Sm-Nd isotope systematics in deep-sea sediments: clay-size versus coarser fractions
Innocent, C.; Fagel, Nathalie; Hillaire-Marcel, C.
2000In Marine Geology, 168 (1-4), p. 79-87
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Keywords :
clay minerals; deep-sea sediments; Last Glacial maximum; Northwest Atlantic; Nd-144/Nd-143
Abstract :
[en] Sm-Nd studies were carried out on Last Glacial and Holocene sediments from the Labrador Sea. Three grain-size fractions were analyzed for each sediment: the clay-size fraction (<2 mu m), the fine cohesive silts (2-10 mu m) and the coarse silts (10-63 mu m) In most cases, Sm-Nd signatures are different from one grain-size to another. In addition, different Sm-Nd signatures are derived from the clay-size fractions compared to the cohesive silt fraction, indicating that the cohesive fraction is heterogeneous and that distinct origins in terms of source-areas are implied. Silt fractions record the influence of supplies from the North American Precambrian Shield, whereas clay-size fractions (<2 mu m) are more sensitive to sedimentary input from the Eastern Basins, in relation with deep currents. Coupling Sm-Nd studies on silt and clay fractions may be a powerful tool to unravel the evolution of deep circulations versus detrital supplies. (C) 2000 Elsevier Science B.V. All rights reserved.
Disciplines :
Earth sciences & physical geography
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Author, co-author :
Innocent, C.
Fagel, Nathalie  ;  Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Hillaire-Marcel, C.
Language :
English
Title :
Sm-Nd isotope systematics in deep-sea sediments: clay-size versus coarser fractions
Publication date :
2000
Journal title :
Marine Geology
ISSN :
0025-3227
eISSN :
1872-6151
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
168
Issue :
1-4
Pages :
79-87
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
CRSNG - Conseil de Recherches en Sciences naturelles et en Génie [CA]
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