Use of satellite magnetic surveys to interpret deep crustal structure, cratonic paleomargins, and associated (?) metallogenic province in the Central U.S.
published: Nov 27, 1995
Open Access (paper can be downloaded for free)
Deep-seated and broad-scale crustal geologic features can play an important role in the genesis and localization of metallogenic provinces. This is because of crustal tectonism, the intracratonic structural and thermal evolution of deep geologic terranes, and reactivation of major basement fracture zones. Such events can be accompanied by deep magmatism, and upwelling and circulation of mineralizing hydrothermal fluids. Long-wavelength magnetic anomaly data, from NASA's MAGSAT satellite, have been combined here with other geophysical and geological data sets to aid in interpreting the crustal framework for economic resources in the U.S. central Midcontinent. Satellite magnetometry can help define major crustal structure, past tectonic development, geologic provinces and their boundaries, and lower-crustal composition and physical properties. In the U.S. Midcontinent, the major metallic-mineral province (lead/zinc/copper/iron) is centered in the Missouri region. It lies over and around the periphery of lower-crustal terrane, as interpreted from our satellite data, of very strong magnetization and thus anomalous petrology, properties, and metamorphic state.