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No Nd-142 Excess in the Early Archean Isua Gneiss IE 715-28There is abundant evidence for the existence of 146Sm in the early solar system and for preservation of effects in the 146Sm-142Nd system in differentiated meteorites ([1]; see recent discussion in Stewart et al. 1994). Information from the 182Hf-182W system, as revised by new careful work [2-3] also indicates that the Earth s core formed relatively early. It is in principle possible for early-formed crust and mantle reservoirs on Earth to have preserved evidence for 146Sm if such reservoirs were produced with high Sm/Nd fractionation and if they have remained isolated and closed since ~4.3 Ga. The mean life of 146Sm of 149 Ma is sufficiently long to make this an intriguing possibility.
Document ID
20030110807
Document Type
Conference Paper
Authors
Papanastassiou, D. A. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Sharma, M. (Dartmouth Coll. Hanover, NH, United States)
Ngo, H. H. (California Inst. of Tech. Pasadena, CA, United States)
Wasserburg, G. J. (California Inst. of Tech. Pasadena, CA, United States)
Dymek, R. F. (Washington Univ. Saint Louis, MO, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Lunar and Planetary Science XXXIV
Subject Category
Geophysics
Funding Number(s)
PROJECT: RTOP 344-31-55-01
Distribution Limits
Public
Copyright
Public Use Permitted.

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