Sm–Nd isotope systematics in deep-sea sediments: clay-size versus coarser fractions
✍ Scribed by C Innocent; N Fagel; C Hillaire-Marcel
- Book ID
- 104156877
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 477 KB
- Volume
- 168
- Category
- Article
- ISSN
- 0025-3227
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✦ Synopsis
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 mm), the ®ne cohesive silts (2±10 mm) and the coarse silts (10± 63 mm). 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 in¯uence of supplies from the North American Precambrian Shield, whereas clay-size fractions (,2 mm) 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.