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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A178 (1981)

First Page: 145

Last Page: 154

Book Title: SG 13: Uranium in Volcanic and Volcaniclastic Rocks

Article/Chapter: Uranium and Thorium in Mid-Cenozoic Rocks of the Mogollon-Datil Volcanic Field, Southwestern New Mexico

Subject Group: Energy Minerals, Etc.

Spec. Pub. Type: Studies in Geology

Pub. Year: 1981

Author(s): Theodore J. Bornhorst (1), Wolfgang E. Elston

Abstract:

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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