Introduction

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

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

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13). In the Atlantic Ocean it is called the Mid-Atlantic Ridge, in the Pacific Ocean it is formed by the East Pacific Rise and the Pacific-Antarctic Ridge, and in the Indian Ocean by the Carlsberg Ridge. The various parts can be defined by their topographic forms and by their geophysical characteristics. These ( 1 9 9) are similar but not identical and M e n a r d has questioned the continuity of the system, preferring to regard the various parts as having a similar underlying cause but being in different stages of development.

In fact, analysis of the fields, or of induced currents within the earth, leads to information about the electrical conductivity within the earth, because of the dependence of the fields observed at the earth's surface upon the conductivity of the medium ( 4 5 1 5 0 , 1 6 )5 The particular relevance of such measurements to us beneath. ' is that the oceanic mantle may differ from the continental mantle, and quantitative estimates of the difference in electrical properties can be deduced from observations of the time-varying magnetic fields.

T h e type of margin that may occur depends upon the region; for example, the continental shelf off the eastern seaboard of the United States is relatively 80 70 75 70 65 65 60 60 5£ 5,0 55 45 50 Fig. 2. Bathymétrie chart of Baffin Bay, between Greenland and Canada. T h e sill to the south is Davis Strait, where the water depth is approximately 300 fathoms. Note the wide shelf on the east o f the Bay, and the narrow shelf on the west of the Bay (compiled by K. S. S. Labrador). The Topography of the Ocean Floor 37 wide, whereas off California it is narrow.

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