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  • 1
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    Constraints on the differentiation of the Earth from the coupled Sm-146,147-Nd-142,143 systematics (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The coupled Sm-Nd systematics are a powerful (albeit analytically challenging) tool for investigating the geodynamic history of the Earth. We have previously reported evidence for a 33 ppm difference of an Isua sample relative to our terrestrial standard. Interpretation yields a formation age range for the depleted mantle (DM) source reservoir of 4.45-4.55 Ga. This is consistent with an epoch of LREE-enriched melt extraction from the mantle (proto-crust formation), soon after magma ocean freeze-up following the putative Moon forming giant impact.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M; p 709-710
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The mean age of mantle and crustal reservoirs (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An analysis of two transport models for trace elements in mantle and crust evolution and related to the observed abundance patterns. In model I, continents are derived by melt extraction over the earth history from undepleted mantle, and the residue forms a depleted mantle which is the current source of mid-ocean ridge basalts. In model II, new additions to continents are derived from a mantle reservoir 2, which becomes more depleted by repeated extraction of melts. The isotopic composition and concentrations of trace elements are shown to reduce to simple mathematical expressions which permit calculations of basic evolutionary parameters. The mean age of the crust mass and isotopic data for the continental crust and the mantle are discussed, concluding with a consideration of their difference in compositions of newly derived crust.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 84; Dec. 10
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A Nd and Sr isotopic study of the Trinity peridotite Implications for mantle evolution (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Field evidence is reported which indicates that the Trinity peridotite in Northern California was partially melted during its rise as part of the upwelling convecting mantle at a spreading center. A Sm-Nd mineral isochron for a plagioclase Iherzolite yielded an age of about 427 Ma which is significantly higher than that expected for depleted mantle during this period. The age is interpreted as the time of crystallization of trapped melt in the plagioclase Iherzolite P-T field, and probably represents the time when the massif was incorporated as a part of the oceanic lithosphere. The Sm-Nd model age of the plagioclase Iherzolite total rock is 3.4 AE. This suggests that the peridotite was derived from a mantle that was depleted early in earth history. Although most available data indicate that the depleted upper mantle has been relatively well stirred through time, the Trinity data suggest that very ancient Nd isotropic values are preserved and chemical and physical heterogeneities are sometimes preserved in the depleted source of midocean ridge basalts as well as the oceanic lithosphere which they intrude.
    Keywords: GEOPHYSICS
    Type: Earth and Planetary Science Letters (ISSN 0012-821X); 68; 3 Ju
    Format: text
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    NASA TECHNICAL REPORTS
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