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Studies by the U.S. Geological Survey in Alaska, 2004
U.S. Geological Survey
Professional Paper 1709-A

26 km of Offset on the Lake Clark Fault Since Late Eocene Time

By Peter J. Haeussler and Richard W. Saltus


aeromagnetic map
Aeromagnetic map of part of south-central Alaska

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.

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For questions about the content of this report, contact Peter Haeussler

Go to other chapters in this series: Haeussler, Peter J., and Galloway, John P., eds., 2005, Studies by the U.S. Geological Survey in Alaska, 2004: U.S. Geological Survey Professional Paper 1709.

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Maintained by: Michael Diggles
Created: October 3, 2005
Last modified: May 2, 2006 (mfd)