Potassium-argon ages of basement rocks from Saint George Island, Alaska
Journal of Research of the U.S. Geological Survey
By: D.M. Hopkins and M.L. Silberman
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Abstract
Potassium-argon ages from basement granitic rocks that intrude serpentinized peridotite on St. George Island, Alaska, range from 50 to 57 million years, with an initial argon isochron age. interpreted as a minimum figure, of 52 ± 2 m.y. The age of the granitic rocks and their association with serpentinized peridotite near the continental margin, which apparently marks the site of a Mesozoic subduction zone, suggest that the position of the subduction zone shifted southward to the Aleutian Trench in early Tertiary time.
Suggested Citation
Hopkins, D., Silberman, M., 1978, Potassium-argon ages of basement rocks from Saint George Island, Alaska: Journal of Research of the U.S. Geological Survey, v. 6, no. 4, p. 435-438.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Potassium-argon ages of basement rocks from Saint George Island, Alaska |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 6 |
| Issue | 4 |
| Year Published | 1978 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 4 p. |
| First page | 435 |
| Last page | 438 |
| Country | United States |
| State | Alaska |
| Other Geospatial | Saint George Island |