Reversals of the Earth's Magnetic Field
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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1 The Earths magnetic field
2 The magnetization of rocks
3 The morphology of geomagnetic reversals
4 Geomagnetic excursions
5 Models for reversals
6 Transition fields
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analysis anomalies axial dipole basalts behaviour Biwa Blake event boundary Cenozoic chron Cobb Mountain component conﬁguration conﬁned conﬁrmed convection correlation Creer Cretaceous dating deep-sea sediments dipole ﬁeld dynamo Earth Planet Earth’s magnetic ﬁeld equations estimated ﬁeld reversal Figure ﬁrst ﬁt ﬂooding ﬂows ﬂuctuations ﬂuid ﬂux frequency geological geological timescale Geomag geomagnetic excursion geomagnetic ﬁeld geomagnetic reversal Geophys hemisphere Iaramillo identiﬁed inclination Kent Lake Biwa Lake Mungo Laschamp latitudes lava ﬂows layer Lett longitude magnetic polarity magnetite magnetostratigraphic Mankinen mantle McFadden Miocene Mono Lake non-dipole ﬁeld normal and reversed normal polarity observed obtained occurred Olduvai Paciﬁc palaeointensity palaeomagnetic palaeomagnetic record period Pleistocene polarity intervals polarity reversals polarity timescale polarity transition pole reﬂect remanent reversal record reversed polarity rocks samples Section secular variation sedimentary sedimentation rate sediments self-reversal sequence showed signiﬁcant Steens Mountain subchron suggested superchron temperature transition ﬁeld VGP paths volcanic