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A RAPID METHOD OF DETERMINING DIP OR MAGNETIZATION INCLINATION FROM MAGNETIC ANOMALIES DUE TO DYKE‐LIKE BODIES *
Author(s) -
POWELL D.W.
Publication year - 1965
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1965.tb01929.x
Subject(s) - geology , igneous rock , metamorphic rock , magnetization , igneous petrology , magnetic dip , earth's magnetic field , magnetic anomaly , outcrop , layering , geophysics , natural remanent magnetization , remanence , petrology , geochemistry , seismology , magnetic field , tectonics , physics , volcanism , engineering geology , botany , quantum mechanics , biology
Anomalies due to igneous dykes or layering within metamorphic rocks often approximate to those calculated for geometric dyke models. In aeromagnetic surveys over outcrops of these rocks, where the ‘depth’ is generally the flying height, the ratio in which two geometric functions combine to produce such anomalies can be determined from profiles. This ratio is influenced by geomagnetic latitude, the strike and dip of the ‘dyke’ and its direction of magnetization. It is practicable to solve for either unknown, i.e. dip or magnetization inclination if the other is assumed. Since igneous dykes tend to be vertical and metamorphic rocks are generally inductively magnetized it is geologically valid to make these assumptions.