The Magnetic View on the Marine Paleoenvironment
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Fig. 9. Central equatorial Atlantic core GeoB 1505-2. Records of susceptibility K, frequency dependence of susceptibility Kfd%' hematite to magnetite index S-O.3T and magnetite grain-size index M.r /~r compared to the 8 18 0
SPECMAP stack (Imbrie et aI. 1984). The anhysteretic remanence Mar was imparted in a constant field of 0.038 mT
and a peak alternating field of 0.1 T. The isothermal remanence M ir has been acquired at a peak field of 0.1 T, the
saturating field for S-03T was 0.8 T. The trends marked at the right side of each plot denote the 'first-order' significance of the respective parameter. For magnetically complex lithologies these simplified classifications may be
inadequate. A sand layer and three tephra layers influence all records. Predominantly cold climatic stages are shaded.