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Lecture 11

EATS1010 - The Dynamic Earth and Space Geodesy Lecture 11

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Department
Earth, Space Science and Engineering
Course
ESSE 1010
Professor
Gary Jarvis
Semester
Fall

Description
Lecture 11 Paleomagnetism Ancient or Past Geomagnetic Fields A record of the prevailing magnetic field is frozen into rocks at the time they first solidify from the molten state Magnetism in rocks How do rocks get magnetized? 1. must contain small grains of magnetic minerals a. e.g. magnetite 2. Magnetic grains align their atomic dipoles with Earth’s magnetic field as they cool from molten magma Polar Wandering Either: (1) The continent is motionless and the magnetic pole moves, or (2) the magnetic pole is motionless and the continent
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