Table 6 Statistical parameters of data trend.
Parameters | Trend | Linear regression R2 | Mann–Kendall test | |
|---|---|---|---|---|
Z-value | P value | |||
δ13Corg | 1 | 0.9434 | – | – |
2 | 0.0282 | –0.52 | 0.602 | |
3 | 0.7171 | – | – | |
4 | 0.9942 | – | – | |
5 | 0.9395 | – | – | |
TOC | 1 | 0.5692 | – | – |
2 | 0.0766 | –0.487 | 0.627 | |
3 | 0.4603 | – | – | |
TI | 1 | 0.3048 | – | – |
2 | 0.8809 | – | – | |
3 | 0.8398 | – | – | |
4 | 0.4062 | – | – | |
5 | 0.9392 | – | – | |
(C27 + C28)/C29 | 1 | 0.5002 | – | – |
2 | 0.7617 | – | – | |
3 | 0.7558 | – | – | |
4 | 0.8208 | – | – | |
5 | 0.0563 | –0.751 | 0.452 | |
6 | 0.9974 | – | – | |
7 | 0.9971 | – | – | |
Pr/Ph | 1 | 0.6676 | – | – |
2 | 0.4828 | – | – | |
3 | 0.9914 | – | – | |
4 | 0.8282 | – | – | |
ETR | 1 | 0.712 | – | – |
2 | 0.2596 | 1.314 | 0.1889 | |
3 | 0.9303 | – | – | |
4 | 0.1614 | –1.608 | 0.108 | |
Clay mineral content | 1 | 0.6596 | – | – |
2 | 0.0019 | –0.05 | 0.96 | |
3 | 0.4204 | – | – | |
GI | 1 | 0.7734 | – | – |
2 | 0.0273 | 0.338 | 0.735 | |
3 | 0.4983 | – | – | |
C30H/C30D | 1 | 0.7208 | – | – |
2 | 0.0138 | –1.072 | 0.284 | |
3 | 0.7267 | – | – | |
