Precise determination of initial ϵNd from Sm-Nd isochron data
作者： I.R. Fletcher , K.J.R. Rosman
DOI: 10.1016/0016-7037(82)90138-7
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摘要: Current methods for evaluating Sm-Nd isochron data determine initial ϵNd (ϵNdi) values by extrapolation to 147Sm144Nd = 0, resulting in unnecessarily large uncertainties. It is shown that of ϵNdi can be optimised determining the present 143Nd144Nd composition a hypothetical sample having chrondritic SmNd. This method determination requires only simple translation its implementation using standard line-fitting techniques, and particularly advantageous providing precise suites limited compositional range close chondritic SmNd. A constructing error (uncertainty) polygons appropriate (ϵNdi, T) discussed, optimumϵNdi are tabulated all published Precambrian isochrons.
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