A reconnaissance study of the U and Th contents of plutonic rocks of the southeastern Seward Peninsula, Alaska
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Abstract
Large granitic Cretaceous plutons are exposed along and adjacent to an arcuate belt of igneous and high-grade metamorphic rocks in the southeastern Seward Peninsula of Alaska. Reconnaissance studies of these plutons have shown that the Darby pluton has well above average amounts of U and Th (11.2 ppm and 58.7 ppm respectively), the Kachauik pluton ranges from average to above average U and Th (5.7 ppm and 22.5 ppm respectively), and the Bendeleben pluton contains average amounts of U and Th (3.4 ppm and 16.7 ppm respectively). The three plutons show compositional and textural differences indicative of different source materials which may have controlled the distribution of U and Th.
The high U and Th contents of the Darby pluton, similar to that of the Conway Granite of New Hampshire which has been mentioned as a possible low grade Th resource, suggests that this pluton may be a favorable area for economic concentrations of U and Th.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | A reconnaissance study of the U and Th contents of plutonic rocks of the southeastern Seward Peninsula, Alaska |
| Series title | Open-File Report |
| Series number | 75-217 |
| DOI | 10.3133/ofr75217 |
| Year Published | 1975 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 24 p. |
| Country | United States |
| State | Alaska |
| Other Geospatial | southeastern Seward Peninsula |
| Google Analytic Metrics | Metrics page |