Isotopes isotopic systematics

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Isotope systematics. There are two Ra isotopes in the Th series, which is shown in Figure 3, and determining the behavior of these Ra isotopes requires consideration of the closely related Th isotopes as well. The factors affecting the groundwater concentrations of each relevant nuclide in the series are ... 

Kaufman A, Wasserburg GJ, Porcelli D, Bar-Matthews M, Ayalon A, Halicz L (1998) U-Th isotope systematics and U-series ages of speleothems from Soreq Cave, Israel and climatic correlations. Earth Planet Sci Lett 156 141-155... 

Sharp, Z. D., Atudoreia, V., Panarellob, H. O., Fernandezb, J. and Douthitt, C. (2003) Hydrogen isotope systematics of hair archeological and forensic applications. Journal of Archaeological Science 30, 1709. 

Three distinct nebular phenomena can in principle contribute to the discordant Mg isotopic systematics late formation of individual anorthites followed by gentle compaction of B2 inclusions, selective secondary alteration of anorthites after inclusion formation, and initial heterogeneities in 26A1 similar to those observed in stable isotopes. The fact that data from anorthites in both B2 inclusions are used to construct the two new Al-Mg correlation lines suggests that whatever processes(es) or... 

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Figure 8. Plot of Li isotopic composition vs. Na O content of eclogites from Trescolmen, Swiss Alps (Zack et al. 2003). Data from pairs of bulk rock ( ) and omphacite mineral separate (O) samples, indicating that bulk rocks generally preserve isotopic systematics of these rocks. Well-preserved, high pressure metamorphosed basaltic rocks were interpreted to retain much of their elemental character, and as such were good recorders of the residue remaining after subduction dehydration. The data indicated that originally isotopically heavy altered sea floor basalt could be transformed during subduction into some of the isotopically lightest materials in the Earth system.

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