Cretaceous plutonic rocks of St. Lawrence Island, Alaska; a preliminary report
Open-File Report
71-82
By: Bela Csejtey Jr., William Wallace Patton Jr., and Thomas P. Miller
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Abstract
Reconnaissance mapping on St. Lawrence Island, Alaska has revealed seven epizonal granitic plutons of mid-Cretaceous age with a combined outcrop area of about 350 square miles. The plutonic rocks are dominantly quartz monzonite, but include minor amounts of granodiorite, monzonite, syenite, syenodiorite, and alaskite.
The plutons are structurally and petrologically similar to and about the same age as plutons on the Chukotsky Peninsula, U.S.S.R. and in western Alaska. They suggest tectonic continuity between Siberia and Alaska since at least Cretaceous time.
Several mineralized areas containing molybdenum, copper, lead, and zinc sulfides are associated with the plutonic bodies in the western part of the island.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Cretaceous plutonic rocks of St. Lawrence Island, Alaska; a preliminary report |
| Series title | Open-File Report |
| Series number | 71-82 |
| DOI | 10.3133/ofr7182 |
| Year Published | 1971 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | Report: 17 p.; 4 Plates: 27.32 x 12.98 inches or smaller |
| Country | United States |
| State | Alaska |
| Other Geospatial | St. Lawrence Island |
| Google Analytic Metrics | Metrics page |