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Evidence from coupled (Sm-147)-(Nd-143) and (Sm-146)-(Nd-142) systematics for very early (4.5-Gyr) differentiation of the earth's mantle
- Source :
- Nature. 360(6406)
- Publication Year :
- 1992
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 1992.
-
Abstract
- Evidence for early differentiation of the earth's mantle is presented based on measurements of Nd-143/Nd-144 and Nd-142/Nd-144 ratios in an approximately 3.8 Gyr-old supracrustal rock from Isua, West Greenland. Coupled (Sm-146,147)-(Nd-142,143) systematics suggest that the fractionation of Sm/Nd took place 4.44-4.54 Gyr ago, due to extraction of a light rare earth element-enriched primordial crust.
- Subjects :
- Geophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00280836
- Volume :
- 360
- Issue :
- 6406
- Database :
- NASA Technical Reports
- Journal :
- Nature
- Publication Type :
- Report
- Accession number :
- edsnas.19930037852
- Document Type :
- Report
- Full Text :
- https://doi.org/10.1038/360728a0