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an N C")!:t Ln co ..... N [I') "" In (\1(") 1f' U") to ..... N ("') C"r.!
u-) cD rDD w w r--: r....: r-..:: r-..: r....: coco cO cDa:ia)ai
I I I I I I I I I i I I I
I
I I i i i 1
150
200
250
300
350
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Age [ka) and 0 18 0 Stages
.2
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Fig. 11. Central equatorial Atlantic core GeoB 1505-2. (a) The predicted susceptibility core log ~re (solid line)
defined as the sum of five estimated partial susceptibilities is in excellent agreement (goodness-of-fit R = 0.986)
with the measured susceptibilities Kobs (dots). Carbonate-free dry mass susceptibilityXcfdm (dashed curve), which
was determined on the basis of CaC0 3 (Zabel et al. 1998) and porosity data, exhibits a similar general pattern as
bulk susceptibility. The core GeoB 1505-2 susceptibility record thus largely delineates flux shifts in terrigenous
material, whereas variable carbonate dilution of the magnetic mineral assemblage is only a secondary effect. (b)
Partial susceptibilities Ksp, Ksd, Khe ' and ~d as percentages of Kj>re - Kdia. The negative diamagnetic term Kdia was
excluded to provide a carbonate-free record of relative changes III the magnetic mineral assemblage. Dissolution
events in sub-stages 6.3,6.5,7.1 , 7.5, 8.3 and stage 10 are documented by a distinct coarsening of magnetite grainsize at K minima. (c) SPECMAP oxygen isotope stack (Imbrie et al. 1984).
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an N C")!:t Ln co ..... N [I') "" In (\1(") 1f' U") to ..... N ("') C"r.!
u-) cD rDD w w r--: r....: r-..:: r-..: r....: coco cO cDa:ia)ai
I I I I I I I I I i I I I
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Age [ka) and 0 18 0 Stages
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E
(I)
Fig. 11. Central equatorial Atlantic core GeoB 1505-2. (a) The predicted susceptibility core log ~re (solid line)
defined as the sum of five estimated partial susceptibilities is in excellent agreement (goodness-of-fit R = 0.986)
with the measured susceptibilities Kobs (dots). Carbonate-free dry mass susceptibilityXcfdm (dashed curve), which
was determined on the basis of CaC0 3 (Zabel et al. 1998) and porosity data, exhibits a similar general pattern as
bulk susceptibility. The core GeoB 1505-2 susceptibility record thus largely delineates flux shifts in terrigenous
material, whereas variable carbonate dilution of the magnetic mineral assemblage is only a secondary effect. (b)
Partial susceptibilities Ksp, Ksd, Khe ' and ~d as percentages of Kj>re - Kdia. The negative diamagnetic term Kdia was
excluded to provide a carbonate-free record of relative changes III the magnetic mineral assemblage. Dissolution
events in sub-stages 6.3,6.5,7.1 , 7.5, 8.3 and stage 10 are documented by a distinct coarsening of magnetite grainsize at K minima. (c) SPECMAP oxygen isotope stack (Imbrie et al. 1984).