Nd isotopic variations and petrogenetic models

Nd isotopic variations and petrogenetic models The decay of 147Sm to 143Nd allows 143Nd/144Nd to be used to trace Sm/Nd fractionation in long time‐scale geologic processes. 143Nd/144Nd has been measured in terrestrial rock samples of different ages to establish the characteristics of Nd isotopic evolution in the crust and mantle. The evolution of 143Nd/144Nd in the mantle indicates Sm/Nd essentially equal to that of chondrites, and implies a chondritic REE distribution for the earth. Variations in 143Nd/144Nd do exist in the mantle, however, indicating Sm/Nd heterogeneity and the existence of distinct mantle reservoirs with characteristic 143Nd/144Nd. 143Nd/144Nd in average crustal rocks today is much lower than found in recent mantle samples and reflects their age and low Sm/Nd. Oceanic tholeiites and alkali basalt are derived from sources with Sm/Nd which has been 5‐10% greater than chondritic over the age of the earth. Alkali basalt can not be derived from mantle reservoirs which have been light REE‐enriched for long times. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Research Letters Wiley

Nd isotopic variations and petrogenetic models

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Publisher
Wiley
Copyright
© 1976 by the Chinese Geophysical Society
ISSN
0094-8276
eISSN
1944-8007
DOI
10.1029/GL003i005p00249
Publisher site
See Article on Publisher Site

Abstract

The decay of 147Sm to 143Nd allows 143Nd/144Nd to be used to trace Sm/Nd fractionation in long time‐scale geologic processes. 143Nd/144Nd has been measured in terrestrial rock samples of different ages to establish the characteristics of Nd isotopic evolution in the crust and mantle. The evolution of 143Nd/144Nd in the mantle indicates Sm/Nd essentially equal to that of chondrites, and implies a chondritic REE distribution for the earth. Variations in 143Nd/144Nd do exist in the mantle, however, indicating Sm/Nd heterogeneity and the existence of distinct mantle reservoirs with characteristic 143Nd/144Nd. 143Nd/144Nd in average crustal rocks today is much lower than found in recent mantle samples and reflects their age and low Sm/Nd. Oceanic tholeiites and alkali basalt are derived from sources with Sm/Nd which has been 5‐10% greater than chondritic over the age of the earth. Alkali basalt can not be derived from mantle reservoirs which have been light REE‐enriched for long times.

Journal

Geophysical Research LettersWiley

Published: May 1, 1976

References

  • A redetermination of the relative abundances of the isotopes of carbon, nitrogen, oxygen, argon, and potassium
    Nier, Nier
  • A Programmable Magnetic Field Mass Spectrometer with On‐line Data Processing
    Wasserburg, Wasserburg; Papanastassiou, Papanastassiou; Nenow, Nenow; Bauman, Bauman

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