Reversals of the Earth's Magnetic Field

Couverture
Cambridge University Press, 24 nov. 1994 - 346 pages
By measuring the direction and intensity of magnetism in rocks of different ages, a record of the Earth's magnetic field in the past can be obtained. This book deals with the particular case of reversals of the Earth's magnetic field. These have played a major role in the development of plate tectonics and in establishing a geological time scale.The magnetism of rocks is discussed in some detail with a warning of possible misinterpretations of the record. The latest observational results and theories are reviewed with special attention to the structure and geometry of the transition field.Changing conditions at the core-mantle boundary, their effect on reversals, the generation of plumes and the possible correlation of reversals with tectonic changes, ice ages or mass extinctions are thoroughly discussed, including suggested periodicities in the reversal record and in other geophysical data.
 

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Table des matières

1 The Earths magnetic field
1
2 The magnetization of rocks
35
3 The morphology of geomagnetic reversals
59
4 Geomagnetic excursions
87
5 Models for reversals
124
6 Transition fields
179
7 Magnetostratigraphy
226
8 The Earths magnetic field and other geophysical phenomena
258
References
294
Index
341
Cover
346
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