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Review of radiometric data from the Yukon crystalline terrane, Alaska and Yukon Territory.

January 1, 1985

The results of > 20 yr of geochronological studies in the Yukon crystalline terrain of east-central Alaska and W Yukon Territory suggest at least six igneous and thermal (metamorphic?) events. Plutonism during Mississippian, early Jurassic, mid-Cretaceous, late Cretaceous and early Tertiary times is indicated. Evidence also indicates that Mississippian, early Jurassic, late early-Cretaceous, and late Cretaceous thermal (metamorphic?) events have affected parts of the terrain. The western part was affected by a significant regional metamorphic event in late early-Cretaceous time, followed by a terrain-wide mid-Cretaceous plutonic event. The pattern of K/Ar ages allows division of the terrain into domains, bounded by NE-trending lineaments. The K/Ar ages (204) are tabulated, with K/Ar ages of 10 mineral pairs.-P.Br.

Citation Information

Publication Year 1985
Title Review of radiometric data from the Yukon crystalline terrane, Alaska and Yukon Territory.
DOI
Authors Frederic H. Wilson, James G. Smith, Nora B. Shew
Publication Type Article
Publication Subtype Journal Article
Series Title Canadian Journal of Earth Sciences
Series Number
Index ID 70013085
Record Source USGS Publications Warehouse
USGS Organization

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