Table 4 EDS point analysis of different regions (wt%)
Position | C | N | O | Na | Al | Si | S | Cl | K | Ca | Fe | Zr | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Fillers | Surface | P1 | 5.3 | / | 2.5 | / | 0.3 | 1.7 | / | / | / | 0.3 | 90.0 | / |
Cross-section | P2 (near surface) | 21.5 | / | 26.8 | / | / | 1.1 | / | / | / | / | 45.9 | 3.2 | |
P3 (further from surface) | 24.5 | / | 18.3 | / | 0.3 | 0.7 | 17.7 | / | 0.2 | / | 35.0 | 3.2 | ||
Skeleton of porous structures | surface | P4 (near fillers) | 6.9 | / | 26.2 | / | 0.7 | 2.1 | 0.7 | 0.3 | / | / | 63.2 | / |
P5 (further from fillers) | 18.1 | / | 25.4 | 0.4 | 2.4 | 12.2 | 0.6 | 0.2 | 0.3 | 0.2 | 40.2 | / | ||
Cross-section | P6 (further from fillers) | 28.3 | / | 36.8 | / | 0.3 | 19.8 | / | / | / | / | 19.8 | / | |
P7 (in shallow pits) | 20.3 | / | 47.1 | / | / | 31.1 | / | / | / | / | 1.5 | / | ||
Brown deposits | Surface | P8 | 6.4 | / | 28.6 | / | 3.0 | 7.7 | 0.5 | / | 2.4 | / | 51.5 | / |
Cross-section | P9 (the outermost layer) | 71.7 | / | 10.1 | 1.3 | 1.3 | 2.2 | 0.8 | 1.1 | 0.4 | 0.1 | 0.4 | / | |
P10 (the bottommost layer) | 11.0 | 1.7 | 31.1 | / | 9.2 | 3.4 | 1.7 | / | / | / | 41.8 | / | ||
Translucent granules | Cross-section | P11 (in porous skeletons) | 13.3 | 2.4 | 40.6 | / | / | 38.1 | / | / | / | / | 0.3 | / |
