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Influence of the Mediterranean outflow on the isotopic composition of neodymium in waters of the North AtlanticMeasurements of the Nd-143/Nd-144 ratio, expressed as epsilon-Nd(0), made in sea water samples obtained at depths from 0 to 4850 m at stations 95, 101, and 30 of North-Atlantic cruise 109-1 of the RV Atlantis II are reported and analyzed. In the 1000-m sample at station 95, determined by salinity, O2, PO4, NO3, SiO2, potential-temperature, and pressure profiles to correspond to the core of the Mediterranean outflow, an epsilon-Nd(0) value of -9.8 + or - 0.6 was found, a significant increase over the layers above and below, where epsilon-Nd(0) is about -12. Mixing estimations give a value for pure Mediterranean waters of approximately -6; continental drainage or volcanic deep-sea sediments are considered possible sources for this more radiogenic Nd. The epsilon-Nd(0) peak in the western North Atlantic (station 30) is found at the surface, and the deep waters are less radiogenic than in the eastern North Atlantic, suggesting multiple Nd sources. Possible origins and distribution mechanisms are discussed.
Document ID
19830062255
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Piepgras, D. J.
(California Inst. of Tech. Pasadena, CA, United States)
Wasserburg, G. J.
(California Institute of Technology Pasadena, CA, United States)
Date Acquired
August 11, 2013
Publication Date
July 20, 1983
Publication Information
Publication: Journal of Geophysical Research
Volume: 88
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
83A43473
Funding Number(s)
CONTRACT_GRANT: NGL-05-002-188
CONTRACT_GRANT: NSF OCE-81-08595
Distribution Limits
Public
Copyright
Other

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