Precise determination of initial Nd from Sm-Nd isochron data

Details Precise determination of initial Nd from Sm-Nd isochron data Precise determination of initial Nd from Sm-Nd isochron data

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.1983f&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Issue 10, pp.1983-1987

Computer Science

22

Scientific paper

Current methods for evaluating Sm-Nd isochron data determine initial Nd ( Nd i ) values by extrapolation to 147 Sm / 144 Nd = 0, resulting in unnecessarily large uncertainties. It is shown that values of Nd i can be optimised by determining the present 143 Nd / 144 Nd composition of a hypothetical sample having chrondritic Sm / Nd . This method of determination requires only a simple data translation for its implementation using standard line-fitting techniques, and is particularly advantageous in providing precise Nd i values for sample suites of limited compositional range close to chondritic Sm / Nd . A method of constructing error (uncertainty) polygons appropriate to the optimised ( Nd i , T ) values is discussed, and optimum Nd i values are tabulated for all published Precambrian Sm-Nd isochrons.

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