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Nd isotopic variations and petrogenetic models
Open accessAbstract
The decay of 147 Sm to 143 Nd allows 143 Nd/144 Nd to be used to trace Sm/Nd fractionation in long time‐scale geologic processes. 143 Nd/144 Nd 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 143 Nd/144 Nd in the mantle indicates Sm/Nd essentially equal to that of chondrites, and implies a chondritic REE distribution for the earth. Variations in 143 Nd/144 Nd do exist in the mantle, however, indicating Sm/Nd heterogeneity and the existence of distinct mantle reservoirs with characteristic 143 Nd/144 Nd. 143 Nd/144 Nd 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.
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Cited by
Trace element and isotopic effects of combined wallrock assimilation and fractional crystallization
DePaolo, D. J. (1981) · Earth and Planetary Science Letters · doi:10.1016/0012-821x(81)90153-9 · Cited by 3,413
Self-citationPrecise determination of SmNd ratios, Sm and Nd isotopic abundances in standard solutions
Wasserburg, G. J., Jacobsen, S. B., DePaolo, D. J., McCulloch, M. T., & Wen, T. (1981) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(81)90085-5 · Cited by 940
Self-citationWood, D. A., Joron, J.-L., & Treuil, M. (1979) · Earth and Planetary Science Letters · doi:10.1016/0012-821x(79)90133-x · Cited by 855
McCulloch, M. T., & Wasserburg, G. J. (1978) · Science · doi:10.1126/science.200.4345.1003 · Cited by 752
Self-citationAlexander, B. W., Bau, M., Andersson, P., & Dulski, P. (2008) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2007.10.028 · Cited by 393
Metadata
- Authors
- DePaolo, D. J., & Wasserburg, G. J.
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 1976-05
- Volume
- 3
- Issue
- 5
- Pages
- 249-252
- ISSN
- 0094-8276 (ISSN-L)
- 1944-8007
- OpenAlex
- W2073426602
- Cited by
- 1,229
- References
- 0
- FWCI
- 21.70
- Type
- journal article
- Language
- en
- Open access
- bronze
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