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Relation of Diagenetic Alteration and Soil-Forming Processes to the Uranium Deposits of the Southeast Texas Coastal Plain

Published online by Cambridge University Press:  01 January 2024

Alice D. Weeks  and
D. Hoye Eargle
Alice D. Weeks
Affiliation:
U.S. Geological Survey, Washington, D.C., and Austin, Texas, USA
D. Hoye Eargle
Affiliation:
U.S. Geological Survey, Washington, D.C., and Austin, Texas, USA
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Abstract

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The Upper Eocene Jackson Group is the chief host rock of the uranium deposits in the Karnes area of the southeast Texas Coastal Plain. It is highly tuffaceous and the uranium deposits are within approximately 100 ft of the unconformity with the overlying Catahoula Tuff (Miocene?). Glass shards, fragments of sanidine and plagioclase, grains of finegrained volcanic rocks, and biotite and other minerals in these sediments were highly reactive chemically, causing complex diagenetic alteration and the development of alkaline carbonate pore water. Extensive caliche development and silica induration associated with a recent hotter, drier climate favored the concentration of uranium. The origin of these shallow uranium deposits is believed to have been controlled by the complex diagenesis of the highly reactive volcanic detritus, by development of a “builtin” solvent for uranium (the alkaline carbonate pore water), and by climatic, structural, and permeability conditions that allowed concentration and deposition of uranium rather than dilution and dispersal. The tuffaceous rocks are considered to have been the source of the uranium and associated molybdenum, phosphorus, and arsenic.

Type
Symposium on Bentonites and Texas Uranium Deposits
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 10 , February 1961 , pp. 23 - 41
Copyright
Copyright © Clay Minerals Society 1961

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