020708 Lecture 5 - Lecture 5: February 7, 2008 Magnetic...

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Lecture 5: February 7, 2008 Magnetic field is determined by processes internal to the planet and their influence is observed everywhere in the globe. 580 degree point- rocks would record the magnetic field when melted and solidify - several phases of melting and solidifying - will record the last time they went below 580 - threshold is important: so we don’t erase the record of the past - mid atlantic/ocean ridge (MOR): symmetry in magnetic polarity Oceanic rocks are recycled in subduction zones. opening of the atlantic - increasing away from the ridge showing that the closer you are, the younger you are and the age - can calculate the rate of continental drift and the rate at which the ridge spread? magnetic field - inclination will change depending on the latitude - equator: parallel to the ground - pole: perpendicular to the ground - if in between: shows the inclination, how far you are form the pole - inclination shows the longitude too - minerals show us the inclination as well as N and S, and where the rock was when it recorded the magnetic field - built in compass in each rock - measure age and where the rock was at that time at that formation
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This note was uploaded on 04/04/2008 for the course WTRPLNT 01:460:204 taught by Professor Rosenthal during the Spring '08 term at Rutgers.

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020708 Lecture 5 - Lecture 5: February 7, 2008 Magnetic...

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