Figure F53. Ternary diagrams showing effects of addition of detrital and authigenic clays to basaltic volcaniclastic material. Inset diagrams show placement of enlarged portions of ternary diagrams on which data are plotted. A. CaO-Al2O3-K2O (CAK) diagram. B. MgO-Al2O3-Fe2O3(T) (MAF) diagram; total iron as Fe2O3T. Symbols distinguish vitric tuffs (red left-pointing triangles) and siltstones (gray triangles). Groups 1 and 2 distinguish samples having, respectively, higher proportions of detrital clay, inferred from their proportionate increase in Al2O3. (See "Diagenesis and Alteration vs. a Detrital Component," , and "Provenance," ). Additional symbols are as follows: small open triangles = glasses from Kilauea and Puna Ridge (Clague et al., 1995); small dots = normal mid-ocean-ridge basalt (N-MORB) glasses from the Pacific-Antarctic East Pacific Rise; large purple dots = N-MORB glass from DSDP Site 501 and three portions of its palagonitized rim (Noack et al., 1983). Fields for kaolinite (K), illite (I), and continental montmorillonite (M) are from Grim (1964). Average pelagic clay (PC) is from Cronan and Toombs (1969). The saponite-nontronite (sap and non) fields (inset diagrams only) are for vein and replacement clays in basalts of DSDP Hole 504B (Honnorez et al., 1983). See "Geochemistry" in the "Explanatory Notes" chapter for a discussion on error.

Figure F53. Ternary diagrams showing effects of addition of detrital and authigenic clays to basaltic volcaniclastic material. Inset diagrams show placement of enlarged portions of ternary diagrams on which data are plotted. A. CaO-Al₂O₃-K₂O (CAK) diagram. B. MgO-Al₂O₃-Fe₂O₃(T) (MAF) diagram; total iron as Fe₂O₃^T. Symbols distinguish vitric tuffs (red left-pointing triangles) and siltstones (gray triangles). Groups 1 and 2 distinguish samples having, respectively, higher proportions of detrital clay, inferred from their proportionate increase in Al₂O₃. (See "Diagenesis and Alteration vs. a Detrital Component" and "Provenance", both in "Geochemistry"). Additional symbols are as follows: small open triangles = glasses from Kilauea and Puna Ridge (Clague et al., 1995); small dots = normal mid-ocean-ridge basalt (N-MORB) glasses from the Pacific-Antarctic East Pacific Rise; large purple dots = N-MORB glass from DSDP Site 501 and three portions of its palagonitized rim (Noack et al., 1983). Fields for kaolinite (K), illite (I), and continental montmorillonite (M) are from Grim (1964). Average pelagic clay (PC) is from Cronan and Toombs (1969). The saponite-nontronite (sap and non) fields (inset diagrams only) are for vein and replacement clays in basalts of DSDP Hole 504B (Honnorez et al., 1983). See "Geochemistry" in the "Explanatory Notes" chapter for a discussion on error.