Abstract

The uranium and thorium distributions in seventy two specimens of accessory zircon from granitic rocks have been examined. Frequency distributions of both elements are positively skewed and the distributions are clearly not normal; both distributions approximate lognormality. The dispersion of the thorium concentration is distinctly greater than that of uranium; ionic radii differences may be the cause. The ratio Th U is also positively skewed and whereas the average ratio is 0.47, the modal (most frequent) value is ~0.35. Though not well-developed, there appears to be a distinct correlation between uranium and thorium in the zircon under consideration.

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