Skip to Main Content
Book Chapter

Sources of Magnetic Anomalies over a Sedimentary Basin: Preliminary Results from the Coastal Plain of the Arctic National Wildlife Refuge, Alaska*

By
Jeffrey D. Phillips
Jeffrey D. Phillips
U. S. Geological Survey, Denver, Colorado, USA
Search for other works by this author on:
Richard W. Saltus
Richard W. Saltus
U. S. Geological Survey, Denver, Colorado, USA
Search for other works by this author on:
Richard L. Reynolds
Richard L. Reynolds
U. S. Geological Survey, Denver, Colorado, USA
Search for other works by this author on:
Published:
January 01, 1998

Abstract

As part of tectonic studies by the Energy Program of the U.S. Geological Survey, we have modeled aeromagnetic anomalies over the coastal plain of the Arctic National Wildlife Refuge (ANWR), Alaska. Preliminary models indicate that the lineated, moderate-intensity anomalies produced by shallow sources within the coastal plain are best fit by a series of stratigraphic layers with both normal and reversed remanent magnetization. The layers follow seismically determined stratigraphic and structural boundaries from near the surface to depths of 1 to 2 km. The modeled total magnetic intensities range up to .115 A/m for the reversely magnetized units and up to .069 A/m for the normally magnetized units. Based on these models, we suspect that the magnetic anomalies are primarily the result of detrital remanent magnetization that formed as the sediments were deposited. Another plausible explanation involves chemical remanence, acquired rapidly with respect to geomagnetic polarity reversals, as the marine turbidite sediments accumulated, thus producing a stratigraphically ordered polarity sequence. The high total magnetizations and reversed polarities leave open the additional possibility that thick sequences of originally reversed magnetization were overprinted by normal remanence through some stratigraphically controlled mechanism.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables

Contents

Society of Exploration Geophysicists Geophysical References Series

Geologic Applications of Gravity and Magnetics: Case Histories

Richard I. Gibson
Richard I. Gibson
Search for other works by this author on:
Patrick S. Millegan
Patrick S. Millegan
Search for other works by this author on:
Society of Exploration Geophysicists
Volume
8
ISBN electronic:
9781560801832
Publication date:
January 01, 1998

GeoRef

References

Related

A comprehensive resource of eBooks for researchers in the Earth Sciences

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal