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Book Chapter

Migration of mantle-derived uranium and thorium within the crust

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Published:
January 01, 1977

Abstract

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.

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Contents

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
Volume
3
ISBN electronic:
9781629812069
Publication date:
January 01, 1977

GeoRef

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