Download e-book for iPad: An Introduction to Marine Geology by M. J. Keen and J. A. Jacobs (Auth.)

By M. J. Keen and J. A. Jacobs (Auth.)

ISBN-10: 0080125050

ISBN-13: 9780080125053

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S. Baffin, by K. S. Manchester). 47 The Topography of the Ocean Floor receives support from levée-like forms associated with it, and from the system of tributaries which joins it. T h e west wall is higher than the east wall. K. S. Manchester has suggested that this can be accounted for by preferential sediment deposition from turbidity currents, caused by the effect of the earth's rotation. The system has not had the attention it deserves. Abyssal hills rise a few hundred metres above the abyssal plains, or are found at the foot of mid-ocean ridges; examples of those which protude from the Iberian plain are seen in Fig.

100 K M . Fig. 5. T h e continental margin off Mexico: typical profiles (after E. Uchupi 280 and K. O. Emery< >). The edges of the continental shelves and the continental slopes are cut in places by canyons, called submarine canyons. These may be V-shaped and several kilometres in width at the top of the V, up to hundreds of ( 8 8) metres in depth and may have steep-sided walls. An example of one from the continental margin of the western part of the North Atlantic, The Topography of the Ocean Floor 41 the Gully, is shown in Figs.

Studies of these anomalies yield information on the geological structure. T n e greater part of the magnetic field of the earth is due to internal causes, but small time-dependent fields are generated externally and are indirectly of solar and lunar origin. These fields include among them the diurnal or daily variation, and if we are interested in the spatial variation of the magnetic field these time-dependent fields must either be negligible or corrections for them should be made. The magnitude of the total field ranges from values of about 30,000 y at the magnetic equator to about 60,000 y at the magnetic poles, and the magnitude of the spatial anomalies of geological origin range from some tens of gamma to some thousands of gamma.

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An Introduction to Marine Geology by M. J. Keen and J. A. Jacobs (Auth.)


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