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Seismotectonic maps in the vicinity of the lower Wabash Valley,Illinois, Indiana, and Kentucky - Digital Spatial Database:Magnetic dikes

Dates

Publication Date
Start Date
1996
End Date
1996
File Modification Date
2013-05-16 14:07:51

Summary

Hildenbrand and Ravat (1997) inferred the locations of near-surface dikes fromanalyses of high-resolution aeromagnetic data. The lines represent locationsof magnetic highs that they interpreted as dikes. Modeling indicates thedikes are vertical, extend to within 200 m of the surface, and have themagnetic properties of mafic or ultramafic rock. Some of the interpreteddikes coincide with the easternmost Early Permian, mica peridotite andperhaps lamprophyre dikes that Nelson mapped (these are in cover lampdike.)Hildenbrand and Ravat concluded that the interpreted dikes arealso probably Early Permian ultramafic intrusions.

Contacts

Point of Contact :
Susan Rhea
Process Contact :
Susan Rhea
Distributor :
Susan Rhea
Metadata Contact :
Peter N Schweitzer
Originator :
Rhea, Susan

Attached Files

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magdike.xml
Potential Metadata Source

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10.61 KB application/fgdc+xml

Purpose

The data was generated to help in understanding the seismotectonic hazardsin the vicinity of the lower Wabash Valley. This data complements similardata collected in the vicinity of New Madrid, MO(US Geological Survey Open-File Report 95-0574, available via ftp at</http://pubs.usgs.gov/of/1995/ofr-95-0574/>)

Additional Information

Identifiers

Type Scheme Key
processingUrl http://sciencebase.org/metadata/geo-nsdi.er.usgs.gov/metadata/open-file/97-681/magdike.xml

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