Skip to Main Content
Book Chapter

Migration of mantle-derived uranium and thorium within the crust

January 01, 1977


The three most readily apparent media for the transport of mantle-derived thorium and uranium to the crust are ultramafic and mafic magmas, alkaline undersaturated magmas, and volatiles. Each type constitutes a distinctive geologic and geochemical environment for the radioelements.

Ocean Basins

Mantle-derived magma has penetrated ocean basins along spreading ridges (Figs. 3, 5) and in plumes. Although irregularly distributed outwardly, the plumes appear to be controlled by regional tectonic features including lineaments and intersections. Along ocean ridges, mantle material intrudes more or less passively in a rising medium. Ocean-ridge magmas range widely in composition from olivine tholeiite to alkali basalt (Aumento, 1967), depending on the degree of partial melting of peridotitic or eclogitic mantle material rising beneath the ridge (Wyllie, 1971, p. 357-359). Most commonly, however, these magmas are tholeiites with very low uranium and thorium contents.

You do not currently have access to this article.

Figures & Tables


AAPG Studies in Geology

Migration of Uranium and Thorium-Exploration Significance

John W. Gabelman
John W. Gabelman
Search for other works by this author on:
American Association of Petroleum Geologists
ISBN electronic:
Publication date:
January 01, 1977




Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal