Regional magnetic anomaly constraints on continental rifting

• Main Authors: Vonfrese, R. R. B., Hinze, W. J., Olivier, R., Bentley, C. R.
• Format: Other/Unknown Material
• Language: unknown
• Published: 1985
• Subjects: 43; Antarc*; Antarctica
• Online Access: http://ntrs.nasa.gov/search.jsp?R=19850023287

Radially polarized MAGSAT anomalies of North and South America, Europe, Africa, India, Australia and Antarctica demonstrate remarkably detailed correlation of regional magnetic lithospheric sources across rifted margins when plotted on a reconstruction of Pangea. These major magnetic features apparently preserve their integrity until a superimposed metamorphoric event alters the magnitude and pattern of the anomalies. The longevity of continental scale magnetic anomalies contrasts markedly with that of regional gravity anomalies which tend to reflect predominantly isostatic adjustments associated with neo-tectonism. First observed as a result of NASA's magnetic satellite programs, these anomalies provide new and fundamental constraints on the geologic evolution and dynamics of the continents and oceans. Accordingly, satellite magnetic observations provide a further tool for investigating continental drift to compliment other lines of evidence in paleoclimatology, paleontology, paleomagnetism, and studies of the radiometric ages and geometric fit of the continents.