Magnetic Reversals On The Ocean Floor

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Magnetic reversals on the ocean floor.

The past record of geomagnetic reversals was first noticed by observing the magnetic stripe anomalies on the ocean floor. Most dry land has a modest elevation above sea level while most of the ocean floor is about 3 kilometers or 2 miles lower down. The area of in between depths e g. Morley frederick john vine and drummond hoyle matthews made.

When magma flows out of a mid ocean ridge small magnetic minerals in the magma align themselves to point in the direction of the earth s current magnetic north. Where the ocean is about 1 kilometer deep is much less. Magnetic reversals moving continents 16. It was determined that the rock of the ocean floor had bands of embedded iron oxides that alternately pointed toward geographic north and geographic south.

Past field reversals can be and have been recorded in the frozen ferromagnetic or more accurately ferrimagnetic minerals of consolidated sedimentary deposits or cooled volcanic flows on land. It is known that leading up to a magnetic reversal the strength of the field. In the 1950s ocean going research vessels recorded puzzling data based on the magnetism of the ocean floor.