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Abstract
Radiometric dates of a high-grade uranium ore from the Hogback No. 4 mine in Dakota Sandstone near Gallup, N. Mex., indicate a late Pleistocene age of mineralization. The 206Pb/238U and 207Pb/235U apparent ages of about 70 000 yr and 100000 yr, respectively, are discordant, but are in broad agreement with the discordant 230Th/238U and 231Pa/235U apparent ages of 130000 yr and 78000 yr, respectively. Although it is not clear how the analyzed sample relates to the main period of mineralization at this mine, these dates are consistent with previous age limits suggested for Dakota Sandstone uranium-ores.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Pleistocene apparent ages by U-Pb isotope and U-series methods for uranium ore in Dakota Sandstone near Gallup, New Mexico |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 5 |
| Issue | 6 |
| Year Published | 1977 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 4 p. |
| First page | 669 |
| Last page | 672 |
| Country | United States |
| State | New Mexico |
| City | Gallup |
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