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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
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Siliceous rocks related to ash-flow tuff cauldrons of the mid-Cenozoic Mogollon-Datil province tend to become more silicic with time; their mean uranium contents rise from 2.8 to 5.2 ppm. Intermediate-composition noncauldron rocks tend to become more mafic with time; mean uranium contents remain constant at 2.3 ppm. Mean thorium contents of all rocks vary sympathetically with SiO2 (5 ppm & 50% SiO2; 25 ppm & 77% SiO2). No commercial uranium deposits are known, but anomolously high uranium occurs in comendites, andesites in which K2O>Na2O, and some mineralized areas. Moat and ring-fracture deposits of cauldrons tend to be depleted in uranium relative to thorium.
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