Chemical fractionation and its relationship to the distribution of thorium and uranium in a zoned granite batholith

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Scientific paper

Major element and radiometric analyses were performed on 79 samples from the Enchanted Rock batholith, Llano Uplift, Texas. The major element data are in agreement with earlier work that the batholith is not zoned in the classical manner, from more mafic rocks along the margins to more felsic in the core, but rather in a more complex fashion. Evidence is offered to suggest that the magma fractionated before and/or during emplacement rather than after. Anomalously high thorium and uranium values can be correlated with the presence of allanite and abundant sphene, whereas the decrease in uranium content with increasing fractionation may be a result of increasingly effective oxidative processes during magmatic crystallization. Thus the distribution of thorium and uranium within the batholith is controlled by secondary, rather than primary, processes.

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