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Primary magnetization components in Plio-Pleistocene sediments at Sites 650, 651, 652, and 654 are carried by titanomagnetite, and can be resolved by progressive thermal demagnetization. Messinian balatino-type gypsum and the underlying Tortonian sediments at Site 654 and the pre-Pliocene sediments at Site 652 also appear to carry a primary magnetization. In contrast, at Hole 653A, the detrital titanomagnetite has been partially altered by reducing diagenetic conditions in the Plio-Pleistocene sediments. Demagnetization techniques resolved secondary and composite magnetization components which usually have steep downward inclinations. Natural remanent magnetization (NRM), saturation isothermal magnetization (SIRM) intensity, and susceptibility tend to decrease downcore, whereas the coercivity of the NRM increases downcore. Microscopic (SEM) observation of pitted titanomagnetites coated by secondary iron sulfide, and an increase in the ratio of ferrous/ferric iron downcore, indicate that the changes in magnetic properties can be explained by progressive reduction of detrital titanomagnetite to iron sulfide.

Contrasting Magnetic Properties in Leg 107 Sediments: Preservation and Alteration of Titanomagnetite at Adjacent Sites