Apparent episodicity of magmatic activity based on radiometric age determination: A section in The United States Geological Survey in Alaska: Accomplishments during 1980

Circular 844
By:  and 

Links

Abstract

Results of recent potassium-argon age studies in the Chignik region, Alaska, (Wilson, 1980; Wilson and others, 1982) have suggested a distinct episodicity in igneous activity during Tertiary time. To date work on the Aleutian magmatic arc indicates that plutonic activity took place along the present outer Pacific margin and in the northern Alaska-Aleutian Range batholith (Reed and Lanphere, 1973; Kienle and Turner, 1976; DeLong and others, 1978) in latest Cretaceous and earliest Tertiary time (70-58 m.y.) and was followed by a hiatus lasting until late Eocene ( 45 m.y~) time. Late Eocene to earliest Miocene ( 45-20 m.y.) magmatic activity was followed by a middle Miocene hiatus (10 m.y.). Since that time, magmatic activity in the Aleutian arc has been continuous.

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Apparent episodicity of magmatic activity based on radiometric age determination: A section in The United States Geological Survey in Alaska: Accomplishments during 1980
Series title Circular
Series number 844
DOI 10.3133/70180224
Year Published 1982
Language English
Publisher U.S. Geological Survey
Publisher location Alexandria, VA
Contributing office(s) Alaska Science Center
Description 3 p.
Larger Work Type Report
Larger Work Subtype USGS Numbered Series
Larger Work Title The United States Geological Survey in Alaska: Accomplishments during 1980 (Circular 844)
First page 13
Last page 15
Country United States
State Alaska