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26 km of offset on the Lake Clark fault since late Eocene time

Professional Paper 1709-A

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Abstract

Aeromagnetic data over the Lake Clark Fault reveal a north-trending band of magnetic anomalies that are right-laterally offset about 26 km across the fault. The magnetic anomalies correlate spatially with a belt of dated 34-39-Ma granitic plutons. Thus, the Lake Clark Fault has had ~26 km of right-lateral offset in the past 34-39 Ma. The Castle Mountain Fault, which lies along the strike of the Lake Clark Fault to the east-northeast, must have had a similar or, possibly, greater amount of offset. We infer the presence of an additional right-lateral strike-slip fault about 35 km northwest of the Lake Clark Fault, herein named the 'Telequana Fault,' on the basis of 11 km of right-lateral offset of a north-trending band of magnetic anomalies.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
26 km of offset on the Lake Clark fault since late Eocene time
Series title:
Professional Paper
Series number:
1709
Chapter:
A
Edition:
-
Year Published:
2005
Language:
ENGLISH
Description:
4 p.
Larger Work Type:
Report
Larger Work Subtype:
USGS Numbered Series
Larger Work Title:
Studies by the U.S. Geological Survey in Alaska, 2004
Number of Pages:
4
Online Only (Y/N):
Y