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Alkaline Igneous Rocks in the Eastern Alaska Range.

Authors
Foley-JY
Source
Alaska State Dept of Natural Resources College Alaska Geol Rept 73 1982 :1-5
Link
NIOSHTIC No.
10006440
Abstract
Previously unreported, alkaline igneous rocks occur in the eastern Alaska range as two dike swarms, one near the West Fork of the Robertson River and another to the east near the Tok River. These rocks intrude the underlying preCambrian and possibly younger, crystalline metamorphic terrane and are believed to be the youngest igneous rocks in the area. A single potassium-argon age date (69.2 +/- 1.5 million years) on biotite indicates that a local, late Cretaceous thermal event was associated with a stage of alkaline magmatism.
Publication Date
19820101
Document Type
OP;
Fiscal Year
1982
Identifying No.
OP 29-82
NIOSH Division
AFOC;
Source Name
Alaska State Dept. of Natural Resources, College, Alaska, Geol. Rept. 73, 1982, PP. 1-5
State
AK;
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division