Physics
Scientific paper
Nov 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962gecoa..26.1115p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 26, Issue 11, pp.1115-1135
Physics
3
Scientific paper
Over 135 samples of the upper Cretaceous Mancos shale have been analysed for uranium, thorium, and potassium by chemical and radiometric means. These samples were collected from 16 localities in Colorado, Utah, Arizona and New Mexico. The average concentrations found in the Mancos shale samples are 10·2 p.p.m. thorium, 3·7 p.p.m. uranium, and 1·9 per cent potassium as metal. The average Th/U ratio is 3·1. For the most part, the variations in the thorium, uranium and potassium concentrations are gradual and take place over large distances. Thorium, Th/U ratio and potassium tend to decrease and uranium tends to increase with distance from the upper Cretaceous shoreline. The K/Th ratio in the shale, including sandy intertongues, shows remarkedly little variation on a regional basis. Laboratory studies indicate that the uranium in the Mancos shale is present largely in the fine-grained primary resistate minerals, and the thorium occurs in the fine-grained secondary resistates or fixed in or on clays.
Adams John A. S.
Pliler R.
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