Skip to main content
U.S. flag

An official website of the United States government

Link between ridge subduction and gold mineralization in southern Alaska

December 31, 1994

40Ar/39Ar geochronology reveals that turbidite-hosted gold deposits in the southern Alaska accretionary prism are the same age as nearby near-trench plutons. These early Tertiary plutons and gold lodes formed above a slab window during subduction of an oceanic spreading center. Ridge subduction is a previously unrecognized tectonic process for the generation of lode gold.