Potassium-argon ages of basement rocks from St. George Island, Alaska
Open-File Report
76-733
By: Miles L. Silberman and David Moody Hopkins
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Abstract
St. George Island is one of the Pribilof Islands which lie between 56°35' and 57°11' N. lat. in the Bering Sea, 350 km north of the Aleutian chain. The islands are situated near the margin of the continental platform that underlies most of the northern half of the Bering Sea (fig. 1). The islands are made up mostly of olivine basalt and basanite flows, pillow breccias, pyroclastic deposits, sills and dikes, most of which are nepheline normative (Barth, 1956). The volcanic rocks are late Pliocene to Holocene in age (Cox and others, 1966; D. M. Hopkins and M. L. Silberman, unpub. data) and are interbedded with marine sand and gravel, glacially derived sediments, frost breccia, and windblown sand and silt.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Potassium-argon ages of basement rocks from St. George Island, Alaska |
| Series title | Open-File Report |
| Series number | 76-733 |
| DOI | 10.3133/ofr76733 |
| Year Published | 1976 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 11 p. |
| Country | United States |
| State | Alaska |
| Other Geospatial | St. George Island |
| Google Analytic Metrics | Metrics page |