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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 66 (1982)

Issue: 8. (August)

First Page: 1168

Last Page: 1169

Title: Use of Previous HitDigitalNext Hit Potential Field, Geologic, and Remote Sensing Data in Studies of Structure of the Mid-Continent: ABSTRACT

Author(s): E. A. Guinness, R. E. Arvidson

Article Type: Meeting abstract

Abstract:

A great deal of Previous HitdigitalNext Hit potential field, geologic, and remote sensing data exists for the Mid-Continent region of the United States. These data sets are fundamental to the understanding of the

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structure of the crust. As the data are geographically oriented and in Previous HitdigitalNext Hit format, standard image-Previous HitprocessingNext Hit and analysis techniques can be applied. For instance, we have used a spatial filtering technique to interpolate between station locations of gravity and magnetic data to produce gray or color-coded images with continuous coverage throughout the Mid-Continent. The images contain more information than found in standard contour maps, because they can have many more contour intervals, and because they preserve local details of anomaly patterns.

As an example of applicability of these techniques, gravity images registered and overlayed with magnetic, geologic, and remote sensing data lead to the identification of a Precambrian rift structure that begins at a break in the Mid-Continent gravity high in southeast Nebraska, extends across Missouri in a northwest-southeast direction, and intersects the Mississippi Valley graben. The rift structure is about 435 mi (700 km) long and 75 to 100 mi (120 to 160 km) wide. It is expressed in gravity images as a low with a Bouguer amplitude of about -34 milligals below regional values. Some of the discrete positive magnetic anomalies in Missouri are located along the borders of the gravity low. The gravity feature cuts across a major age boundary within the Precambrian basement.

Finally, digitally enhanced thermal infrared images show a distinct alignment of linear structures with the gravity feature. The linears in some places correspond to mapped high-angle normal faults, to drape folds over relief within the Precambrian basement, and in some places, to extensions of mapped structures.

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Copyright 1997 American Association of Petroleum Geologists