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Neodymium isotopes in flood basalts from the Siberian Platform and inferences about their mantle sources

DePaolo, D. J. and Wasserburg, G. J. (1979) Neodymium isotopes in flood basalts from the Siberian Platform and inferences about their mantle sources. Proceedings of the National Academy of Sciences of the United States of America, 76 (7). pp. 3056-3060. ISSN 0027-8424. http://resolver.caltech.edu/CaltechAUTHORS:DEPpnas79

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Abstract

The initial isotopic compositions of Nd and Sr in basalts from the Central Siberian Plateau and other major continental flood basalts are reported. The continental flood basalts appear to be the product of partial melting of mantle sources that consist of relatively primitive undifferentiated material and are clearly distinct from midocean ridge basalts, which sample mantle reservoirs that have been modified by extraction of continental crust earlier in earth history. These observations provide fundamental constraints on models of mantle structure and dynamics. Isotopic effects of crustal contamination are clearly recognizable in some continental flood basalts, but these effects can be distinguished from isotopic patterns inherited from the mantle magma sources.


Item Type:Article
Additional Information:© 1979 by the National Academy of Sciences. Contributed by G.J. Wasserburg, April 26, 1979. We thank V.L. Barsukov, Director of the Vernadsky Institute, and Dr. Yuri I. Dmitriyev of the Institute of Geology of Ore Deposits for their generous aid in obtaining samples of the Siberian Traps and providing information on their occurrence. We are indebted to Dr. Umberto Cordani of the University of Sao Paulo, Brazil, for samples of Parana basalts and to Tom Wright and Donald Swanson of the U.S. Geological Survey for samples of Columbia River basalt and unpublished Sr data on sample 73-22, which prompted our analysis of this sample. Discussions with Donald Swanson were also of great aid. Wes Myers of Atlantic Richfield Hanford Company was very helpful in selecting Columbia River basalts, both in the field and the cold storage sheds. English translations of Russian articles describing the petrology of the Siberian basalts are available upon request from G.J.W. This work was supported by grants from the National Aeronautics and Space Administration (NGL 05-002-188) and the National Science Foundation (EAR 76-22494 and EAR 78-12966). This is contribution number 3196 (289) from the Division of Geological and Planetary Sciences. The publication costs of this article were defrayed in part by page charge payment. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. §1734 solely to indicate this fact.
Subject Keywords:strontium isotopes; trace elements; igneous petrology; earth evolution
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Caltech Division of Geological and Planetary Sciences3196
Lunatic Asylum Lab289
Record Number:CaltechAUTHORS:DEPpnas79
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:DEPpnas79
Alternative URL:http://www.pnas.org/cgi/content/abstract/76/7/3056
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8965
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Oct 2007
Last Modified:14 Nov 2014 19:20

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