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Cursory shipboard magnetic surveys were conducted on the Glomar Challenger's drill rig floor. The surveys included measurement of the field associated with: the drill string, with 1300 m of pipe extended below the ship; the drill pipe stored on the pipe racks at the bow of the ship; and the core racks where the core liners are cut to 1.5-m segments. The results of these measurements indicate that rocks are being exposed to very large magnetic fields associated with the core racks. As a result of these studies, scientists on the Glomar Challenger requested that the steel core racks be replaced by aluminum ones during the dry-dock period subsequent to Leg 75. By utilizing a less magnetic metal, the possibility of remagnetization of core material should be greatly reduced.

Magnetometer Measurements on the Drilling Floor of the Glomar Challenger: Possible Causes of Rock Remagnetization