Inferences about magma sources and mantle structure from variations of ^(143)Nd/^(144)Nd

DePaolo, D. J. and Wasserburg, G. J. (1976) Inferences about magma sources and mantle structure from variations of ^(143)Nd/^(144)Nd. Geophysical Research Letters, 3 (12). pp. 743-746. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20131216-141125720

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Abstract

Continental flood basalts and mid-ocean ridge (MOR) tholeiitic basalts have distinctly different ^(143)Nd/^(144)Nd which may permit a priori distinction between "continental" and "oceanic" igneous rocks. Initial ^(143)Nd/^(144)Nd of continental igneous rocks through time fall on a Sm/Nd evolution curve with chondritic REE abundance ratio. These observations indicate that many continental igneous rocks are derived from a reservoir with chondritic REE pattern which may represent primary material remaining since the formation of the earth. Oceanic igneous rocks are derived from a different ancient reservoir which has Sm/Nd higher than chondritic. Initial ^(143)Nd/^(144)Nd and ^(87)Sr/^(86)Sr in young basalts from both oceans and continents show a strong correlation suggesting that Sm-Nd and Rb-Sr fractionation events in the mantle may be correlative and caused by the same process. From this correlation Rb/Sr for the earth is inferred to be 0.029.

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Article

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URL	URL Type	Description
http://dx.doi.org/10.1029/GL003i012p00743	DOI	Article
http://onlinelibrary.wiley.com/doi/10.1029/GL003i012p00743/abstract	Publisher	Article

ORCID:

Author	ORCID
Wasserburg, G. J.	0000-0002-7957-8029

Additional Information:

© 1976 American Geophysical Union. Received September 30, 1976, accepted November 4, 1976. We thank J. Gittins, T. Simkin, W. S. Baldridge, H. R. Bowman, W. G. Melson, G. Thompson, Tj. H. van Andel, V. Bowen, T. Bence, A. R. McBirney, A. J. Gancarz, L. T. Silver, and G. Goles for providing samples. This work was supported by NASA Grant NGL 05-002-188 and NSF Grant PHY 76-02724.

Funders:

Funding Agency	Grant Number
NASA	NGL 05-002-188
NSF	PHY 76-02724

Other Numbering System:

Other Numbering System Name	Other Numbering System ID
Caltech Division of Geological and Planetary Sciences	2830

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CaltechAUTHORS:20131216-141125720

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43029

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CaltechAUTHORS

Deposited By:

Ruth Sustaita

Deposited On:

16 Dec 2013 23:47

Last Modified:

09 Mar 2020 13:19

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