Variation of thorium and uranium in selected granitic rocks

Details Variation of thorium and uranium in selected granitic rocks Variation of thorium and uranium in selected granitic rocks

Sep 1961

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961gecoa..25...99r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 25, Issue 2, pp.99-109

Computer Science

5

Scientific paper

A selected suite of granitic rocks representing both individual differentiation sequences and a broad sampling of granites from North America have been analysed for thorium, uranium, and potassium by -ray spectrometry. In the White Mountain and Oliverian series of New Hampshire both the thorium and uranium contents and the Th/U ratio tend to increase with igneous evolution. In the Southern California batholith the thorium and uranium contents increase during differentiation, but the Th/U ratio is constant. The general tendency for the Th/U ratio to increase with petrogenetic evolution is shown by a comparison of the Th/U ratio with the ratio of potassium feldspar to plagioclase for a broad sampling of granitic rocks. This increase is probably caused by oxidation during magmatic differentiation

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