Figure F3. Comparison of four frequently used semiquantitative determinations for the clay mineral assemblages based on single peak intensities (PS2206-4 Gakkel-Ridge, water depth = 2993 m). Calculation by Vogt (1997) is based on Biscaye’s factors and XRD pattern analysis techniques (1964, 1965). Systematic decrease in illite mineral group content calculated after Pearson and Small (1988) is due to the determination of a fifth mineral group, the mixed-layered clays, which is basically deducted from the illite group. MIS = marine isotope stage.
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