钉牢
发表于 2025-3-28 17:25:54
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AMOR
发表于 2025-3-28 19:15:39
Sm-Nd Datingnd ultramafic rocks that are, in general, difficult to date using other methods. The principles of Sm-Nd dating are identical to those of Rb-Sr dating, which have been discussed in detail elsewhere (e.g. Lanphere et al. 1963; Faure 1977). The underlying assumption is that at some time T. in the past
茁壮成长
发表于 2025-3-29 00:55:30
Igneous Processes and Nd Isotopic Variationsng, fractional crystallization, and mixing. With regard to partial melting, the models that will be described here carry the assumption that equilibrium is always maintained between the magma and the residual solid material in the melting rock.
deviate
发表于 2025-3-29 07:02:31
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Flat-Feet
发表于 2025-3-29 07:56:14
Correlation of Nd Isotopic Variations with Other Isotopic Variationsariations of different elements are extremely important. This has become even more obvious with the added information provided by the rare gas isotopes .He, .Ar, and .Xe (e.g. Clarke et al. 1969; Craig et al. 1978a, b; Kurz et al. 1982a, b; Lupton 1983; Staudacher and Allègre 1982; Hart et al. 1979)
obviate
发表于 2025-3-29 12:44:16
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爱花花儿愤怒
发表于 2025-3-29 17:51:58
Oceanic Crust and Mantlemation about the chemical composition of magma sources. Oceanic basalts present the possibility of applying the isotopic data for this purpose in a relatively straightforward way because there is little likelihood that the magmas are modified by contamination with old continental crust between the t