Radiometric dating of intrusive rocks in the Cottonwood area, Utah
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Abstract
Recently completed fission-track and K-Ar dating of zircon, sphene, apatite, muscovite, biotite, and hornblende indicate that the Clayton Peak stock was intruded 37-41 m.y. ago, the Alta stock about 32-33 m.y. ago, and the Little Cottonwood stock between 24 and 31 m.y. ago. Pb-a ages on zircon, though showing the same sequence, are about twice as great and are inferred to represent a partial
mixing of inherited Precambrian zircons. Acceptance of a middle Tertiary age for the Little Cottonwood stock requires revision of earlier
interpretations that it could be as old as Late Cretaceous. K-Ar dates also indicate that the Keetley Volcanics are 32 to 35 m.y. old, and a
single date of 37.3 m.y. was obtained on the Traverse Volcanics, suggesting that they are more closely related to volcanic activity in the
adjoining Oquirrh Mountains.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Radiometric dating of intrusive rocks in the Cottonwood area, Utah |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 1 |
| Issue | 2 |
| Year Published | 1973 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 6 p. |
| First page | 173 |
| Last page | 178 |
| Country | United States of America |
| State | Utah |
| Other Geospatial | Litte Cottonwood Stock |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |