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The south-central United States magnetic anomalyA positive magnetic anomaly, which dominates the MAGSAT scalar field over the south-central United States, results from the superposition of magnetic effects from several geologic sources and tectonic structures in the crust. The highly magnetic basement rocks of this region show good correlation with increased crustal thickness, above average crustal velocity and predominantly negative free-air gravity anomalies, all of which are useful constraints for modeling the magnetic sources. The positive anomaly is composed of two primary elements. The western-most segment is related to middle Proterozoic granite intrusions, rhyolite flows and interspersed metamorphic basement rocks in the Texas panhandle and eastern New Mexico. The anomaly and the magnetic crust are bounded to the west by the north-south striking Rio Grande Rift. The anomaly extends eastward over the Grenville age basement rocks of central Texas, and is terminated to the south and east by the buried extension of the Ouachita System. The northern segment of the anomaly extends eastward across Oklahoma and Arkansas to the Mississippi Embayment. It corresponds to a general positive magnetic region associated with the Wichita Mountains igneous complex in south-central Oklahoma and 1.2 to 1.5 Ga. felsic terrane to the north.
Document ID
19850023278
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Starich, P. J.
(Purdue Univ. West Lafayette, IN, United States)
Hinze, W. J.
(Purdue Univ. West Lafayette, IN, United States)
Braile, L. W.
(Purdue Univ. West Lafayette, IN, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Publication Information
Publication: Improving the Geol. Interpretation of Magnetic and Gravity Satellite Anomalies
Subject Category
Earth Resources And Remote Sensing
Accession Number
85N31591
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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