Abstract
Uraniferous sandstone deposits commonly resulted when uranium in groundwater precipitated in reducing environments caused by degradation of ancient wood and organic debris. However, the mineralogy of uranium in fossil wood has received relatively little study. Previous microscopic observations of petrified wood from a few uranium mines have demonstrated that uranium in fossil wood primarily involves the oxide mineral uraninite or the silicate mineral coffinite, often in association with metal sulfides such as chalcopyrite. These observations are applicable to primary ore zones that are located below the water table, where oxidation is inhibited. New analyses utilizing scanning electron microscopy and X-ray fluorescence (SEM/EDS) reveal that fossil wood from oxidized ore zones may contain a diverse variety of uranium minerals, including carnotite, tyuyamunite, and zippeite, as well as various vanadate and sulfate minerals. Uranium-bearing common opalized wood and stratiform common opal from two prospects in Nevada, USA, contain no identifiable uranium minerals. Instead, the element is dispersed in trace amounts within the opal.
Highlights
For most of human history, uranium has been an element that had very little usefulness.Uranium-tinted glass is known from 79AD [1]
The purpose of this study is to provide an overview of uranium mineralization in fossil wood from localities in western USA, using optical microscopy, scanning electron microscopy, and energy dispersive X-ray fluorescence spectrometry
In the 1950s the production of uranium for construction of nuclear weapons and nucler power plants provided an incentive for numerous scientific studies, but these investigations were gnerally focused on factors that related to economic geology
Summary
For most of human history, uranium has been an element that had very little usefulness. Uranium-tinted glass is known from 79AD [1]. Pure uranium was first isolated in 1841, and Henri. Until the late 1930s commercial use of uranium was largely limited to uranium oxides that were employed for ceramic glaze and glass tinting. Scientific interest increased after Enrico Fermi’s team observed fission of uranium in 1939. In 1940, the transmutation of uranium to plutonium was discovered. These events marked the beginning of the Atomic Era, when the power of fission was understood to release enormous energy that could be used for nuclear weapons and generation of nuclear power
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