Uranium contents of glassy and devitrified andesites and dacites, Mount Mazama, Oregon
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Abstract
By direct comparison of devitrified and granophyrically crystallized specimens with nonhydrated glassy materials from the same units, Rosholt and coworkers (Rosholt and Noble, 1969; Rosholt et al., 1971) showed that specimens of primarily crystallized but otherwise unaltered peralkaline and subalkaline rhyolite from the western United States had lost from 30 to 80 percent of the uranium that they originally possessed. They suggested that uranium was lost both during crystallization, perhaps as the volatile hexafluoride, and/or later through the action of ground water. Similar results have been obtained by Shatkov et al. (1970) and Kovalev and Maylasova (1973).
Zielinski (1978) compared the uranium contents of paired nonhydrated glassy and primarily devitrified phases of a number of subalkaline rhyolitic lavas and tuffs from various localities in the western United States. He found a generally smaller degree of uranium loss than had been observed by Rosholt et al. (1971) for peralkaline materials. In addition, Zielinski noted that older specimens had, as a group, lost a greater percentage of their original uranium than had younger rocks and suggested that uranium is generally lost progressively over periods of many millions of years.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Uranium contents of glassy and devitrified andesites and dacites, Mount Mazama, Oregon |
| Series title | Economic Geology |
| DOI | 10.2113/gsecongeo.75.1.127 |
| Volume | 75 |
| Issue | 1 |
| Year Published | 1980 |
| Language | English |
| Publisher | Society of Economic Geologist |
| Contributing office(s) | Central Energy Resources Science Center |
| Description | 3 p. |
| First page | 127 |
| Last page | 129 |
| Country | United States |
| State | Oregon |
| Other Geospatial | Mount Mazama |
| Google Analytic Metrics | Metrics page |