The use of stable-isotopic ratios of a number of elements (e.g., H, Li, B, C, N, O, and S) is well established in the study of a broad spectrum of geological and environmental problems such as alteration of the oceanic crust, magmatic-crustal interactions, global chemical fluxes, the nature of the Precambrian crust and identifying the source and fate of pollutants (e.g., Taylor 1968; Muelenbachs and Clayton 1976; Muelenbachs 1980; Gregroy and Taylor 1981; Poreda et al. 1986; Spivack and Edmond 1986; Tanaka and Rye 1991; Mojzsis et al. 2001; Wilde et al. 2001; Numata...

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