Nd isotopic heterogeneity in late-Hercynian granitic plutons from Central Spain

1. Villaseca González, Carlos
2. Barbero González, Luis C.
3. Rogers, G.
4. Reyes Hernández, Javier
5. Santos Zalduegui, José Francisco

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Abstract

Some Hercynian granitic plutons from Central Spain show variation in initial Nd isotopic ratios defining different trends with increasing silica content. There is a decoupling between the Sr and Nd isotopic systems as these plutons present homogeneous initial Sr ratios. Magmatic processes could explain this Nd isotopic disequilibrium; it is suggested that Nd-bearing restitic or early precipitating accesory phases could control the Nd isotopic heterogeneity of the granites

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