Chemical structure and evolution of the mantle and continents determined by inversion of Nd and Sr isotopic data. I Theoretical metods. II - Numerical experiments and discussion

Details Chemical structure and evolution of the mantle and continents determined by inversion of Nd and Sr isotopic data. I Theoretical metods. II - Numerical experiments and discussion Chemical structure and evolution of the mantle and continents determined by inversion of Nd and Sr isotopic data. I Theoretical metods. II - Numerical experiments and discussion

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..66..177a&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 66, Dec. 1983, p. 177-213. Research supported by the Centre National

Computer Science

Numerical Analysis

44

Chemical Evolution, Earth Crust, Earth Mantle, Geochemistry, Geodynamics, Radioactive Age Determination, Graph Theory, Mathematical Models, Neodymium Isotopes, Numerical Analysis, Strontium Isotopes

Scientific paper

In the first part of the present study, the Rb/Sr and Sm/Nd isotopic systematics of several three-box models are investigated, using mass balance equations and the definition of the mean age of the reservoirs. The geochemical uniqueness of the models, which have been chosen from a large family of posible ones, is evaluated on the basis of elementary graph theory. These models are then solved by means of a total inversion approach. The second part applies this inversion technique to models in which the depleted midocean ridge basalt (MORB) mantle is created by the extraction of continental crust results in a stable and self-consistent set of model data, including uncertainty estimates for all parameters. The fraction of the total mantle which has been depleted depends on whether the lower mantle is virgin, whether the depleted reservoir is presented in Sm/Nd and Rb/Sr systematics by average or extreme MORB values, and whether the bulk earth Nd content is presumed to be similar to E or H chondrites, or is higher than all known meteoric classes.

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