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The isotopic composition of Nd in different ocean masses

Piepgras, D. J. and Wasserburg, G. J. and Dasch, E. J. (1979) The isotopic composition of Nd in different ocean masses. Earth and Planetary Science Letters, 45 (2). pp. 223-236. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20131022-152821831

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Abstract

Sm-Nd data for authigenic ferromanganese sediments from the oceans indicate that the Atlantic, Pacific, and Indian Oceans each have a distinct range in Nd isotopic composition which are characteristic of each ocean basin and reflect the dissolved load of Nd in the water mass. Within each basin, Nd isotopic compositions show some variability but are relatively well defined. Isotopic compositions of Nd measured in these samples are all far less than the ^(143)Nd/^(144)Nd ratios of source rocks with oceanic affinities. Direct measurements of the Nd isotopic composition of seawater presented here support the view that REE in ferromanganese sediments are derived by the direct precipitation of these elements out of seawater. Nd isotopic variations in ferromanganese sediments cannot be explained by contributions from continental detritus. It is therefore believed that the Nd isotopic variations found for ferromanganese sediments represent true variations in the isotopic composition of Nd dissolved in seawater in various ocean masses. These variations reflect primarily the age and ^(147)Sm/^(144)Nd of the continental masses being sampled, which is believed to be the major source of REE in seawater. These variations indicate that the residence time of Nd in seawater must be very short relative to the mixing rates between ocean masses. Nd isotopic studies, both in seawater and sediments should, therefore, be useful as a monitor of ocean currents and interocean mixing over the past several million years.


Item Type:Article
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http://www.sciencedirect.com/science/article/pii/0012821X79901250PublisherArticle
Additional Information:© 1979 Elsevier Scientific. Received May 15, 1979. Revised version received July 26, 1979. This study was initiated in 1978 as a result of the mutual interests of members of both the California Institute of Technology and Oregon State University The analytical work was carried out at Caltech on samples prepared at OSU The results comprised part of the requirements for a degree of Master of Science for D J P who was a graduate student at OSU D J P would like to thank Malcolm McCulloch for providing the necessary laboratory Instruction needed to conduct this research Samples used in this study were provided by J Greenslate, J Honnorez, F McCoy, F Manhelm, W S Moore, J Dymond, T Walsh, and R Senechal J Corliss helped us to obtain the seawater samples This research was supported in part by grants from NSF PHY 76-02724, NSF GX-28675, NSF OCE 77-11101, NASA NGL 05-002-188, and GSA 2382-78.
Funders:
Funding AgencyGrant Number
NSFPHY 76-02724
NSFGX-28675
NSFOCE 77-11101
NASANGL 05-002-188
NASAGSA 2382-78
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences3254
Lunatic Asylum Lab307
Record Number:CaltechAUTHORS:20131022-152821831
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20131022-152821831
Official Citation:D.J. Piepgras, G.J. Wasserburg, E.J. Dasch, The isotopic composition of Nd in different ocean masses, Earth and Planetary Science Letters, Volume 45, Issue 2, November 1979, Pages 223-236, ISSN 0012-821X, http://dx.doi.org/10.1016/0012-821X(79)90125-0. (http://www.sciencedirect.com/science/article/pii/0012821X79901250)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42014
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:22 Oct 2013 22:53
Last Modified:28 Oct 2013 20:47

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