Premium
A satellite magnetic model of northeastern South American Aulacogens
Author(s) -
Longacre M. B.,
Hinze W. J.,
Frese R. R. B.
Publication year - 1982
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl009i004p00318
Subject(s) - magnetic anomaly , lithosphere , geology , rift , geophysics , anomaly (physics) , gravity anomaly , geodesy , seismology , physics , tectonics , paleontology , oil field , condensed matter physics
Magnetic modeling of the Amazon River and Takatu Aulacogens in northeastern South America illustrate the utility of satellite magnetic data in characterizing the properties and structure of the lithosphere. Specifically, reduction of preliminary MAGSAT scalar magnetic anomaly data to an equivalent condition of vertical polarization shows a general correlation between magnetic anomaly minima and the Amazon River and Takatu Aulacogens. Surface gravity data demonstrate a correlative positive anomaly. Spherical earth modeling of the magnetic data indicates a less magnetic crust associated with the aulacogens which is compatible with previous studies over the Mississippi River Aulacogen and Rio Grande Rift in North America.