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Document Type

Research

Keywords

Fayette Structural Zone, gravity anomaly, gravity profile, basement

Abstract

A gravity survey was conducted over approximately 2600 square kilometers of northeast Iowa. The survey was undertaken to provide detailed gravity coverage at approximately one mile intervals and to investigate the sources of gravity anomalies in the study area. An additional objective was to verify with gravity data the presence of the Fayette Structural Zone, previously identified on the basis of magnetic linears. Four hundred and twenty-seven gravity stations were occupied and data from these stations combined with extant data from the Geological Survey Bureau of the Iowa Department of Natural Resources to produce the gravity interpretation. A Bouger gravity anomaly map was prepared and profile analysis undertaken to examine the source-configuration of intrusive bodies located within the basement of the study area. The gravity data, when combined with available magnetic and drill hole information, indicate a predominantly felsic basement with several gabbro and ultramafic intrusive bodies. Modeling of the gravity data failed to confirm either faulting or a dike at the presumed location of the Fayette Structural zone.

Publication Date

September-December 1993

Journal Title

Journal of the Iowa Academy of Science

Volume

100

Issue

3-4

First Page

72

Last Page

77

Copyright

© Copyright 1993 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf