Table 4 Redox environment indexes for mudstone
Indexes | Data range/avg | Redox | References | ||
|---|---|---|---|---|---|
| Â | Â | Anaerobic | Poor oxygen | Oxidizing | Â |
V/Ni | 3.8–17.29/6.52 |  > 1 | < 1 | Jones and Manning (1994) | |
V/ (Ni + V) | 0.78–0.95/0.85 |  > 0.6 | 0.46–0.6 | < 0.46 | Jones and Manning (1994) |
U/Th | 0.27– 7.98/2.18 |  > 1.25 | 0.75–1.25 | < 0.75 | Jones and Manning (1994) |
Ceanom | − 0.2022–0.0409/− 0.03431.0062 | > − 0.1 | < − 0.1 | Elderfield and Greaves (1982) | |