Figure F9. Calculated values of clay mineral abundance within bulk sediment samples from DSDP Site 297. See Figure F1, for location and Figure F6, for stratigraphic column. Percentages of total clay minerals are based on X-ray diffraction analyses of random bulk powders (Table T7). Estimates of the percentage contributed by each individual clay mineral are products of total clay (Table T7) times the relative percentage of each clay within the <2-µm size fraction (where %smectite + %illite + %chlorite = 100%) (Table T8). Open circles = estimates derived from SVD (singular value decomposition) method, solid circles = values based on Biscaye (1965) weighting factors.

Figure F9. Calculated values of clay mineral abundance within bulk sediment samples from DSDP Site 297. See Figure F1 for location and Figure F6 for stratigraphic column. Percentages of total clay minerals are based on X-ray diffraction analyses of random bulk powders (Table T7). Estimates of the percentage contributed by each individual clay mineral are products of total clay (Table T7) times the relative percentage of each clay within the <2-µm size fraction (where %smectite + %illite + %chlorite = 100%) (Table T8). Open circles = estimates derived from SVD (singular value decomposition) method, solid circles = values based on Biscaye (1965) weighting factors.