Tucker, Peter; Tauxe, Lisa (1984): The downhole variation of the rock-magnetic properties of DSDP Leg 73 Holes. PANGAEA, https://doi.org/10.1594/PANGAEA.811201, Supplement to: Tucker, P; Tauxe, L (1984): The downhole variation of the rock-magnetic properties of Leg 73 sediments. In: Hsü, KJ; LaBrecque, JL; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 73, 673-685, https://doi.org/10.2973/dsdp.proc.73.129.1984
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The magnetic stability and mean intensity of the natural remanent magnetization (NRM) of Leg 73 sediments (Holes 519 to 523) decreases with the age of the sediment. We demonstrate that these variations are linked with physical and chemical changes in the magnetic grains themselves. Alteration of the magnetic component occurs most rapidly shortly after deposition. A significant magnetic alteration over the topmost few meters of the sediments is thought to be the result of oxidation. The modification of the NRM characteristics through the partial dissolution of the carbonate is largely accounted for by the effects of concentraion of the magnetic minerals. We apply the techniques of rock-magnetism and X-ray fluorescence analysis to clarify the physical and chemical mechanisms that affect the magnetic character of the sediment.
Median Latitude: -27.571743 * Median Longitude: -4.988637 * South-bound Latitude: -29.484200 * West-bound Longitude: -11.666200 * North-bound Latitude: -26.073800 * East-bound Longitude: 3.512300
Date/Time Start: 1980-04-22T00:00:00 * Date/Time End: 1980-05-21T00:00:00
73-519 * Latitude: -26.136700 * Longitude: -11.666200 * Date/Time: 1980-04-22T00:00:00 * Elevation: -3769.0 m * Penetration: 151.6 m * Recovery: 138.1 m * Location: South Atlantic/RIDGE * Campaign: Leg73 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 37 cores; 151.6 m cored; 0 m drilled; 91.1 % recovery
73-521 * Latitude: -26.073800 * Longitude: -10.264500 * Date/Time: 1980-05-02T00:00:00 * Elevation: -4125.0 m * Penetration: 84 m * Recovery: 75.2 m * Location: South Atlantic/HILL * Campaign: Leg73 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 21 cores; 84 m cored; 0 m drilled; 89.5 % recovery
73-522 * Latitude: -26.114000 * Longitude: -5.129700 * Date/Time: 1980-05-06T00:00:00 * Elevation: -4441.0 m * Penetration: 148.7 m * Recovery: 137.6 m * Location: South Atlantic/PLATEAU * Campaign: Leg73 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 36 cores; 143.8 m cored; 5 m drilled; 95.7 % recovery