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Table 3 Cross-correlations between geochemical, microstructural and optical signals in the studied fossil brachiopodCross-correlations are calculated between isotope composition (δ13C and δ18O), minor-element (Mn, Fe, and Mn) concentrations, MCLI, and AFR or ΑF-PCR of the fossil Terebratalia coreanica and Laqueus rubellus shells. Coefficient values in brackets are not statistically significant (p > 0.01)
| δ13C (‰VPDB) | δ18O (‰VPDB) | Mn (ppm) | Fe (ppm) | Sr (ppm) | Mean CL intensity (MCLI: 0–255) | Altered fiber and puncta-filling cement ratio (AF-PCR: %) | |
|---|---|---|---|---|---|---|---|
| Fossil T. coreanica and L. rubellus (n = 36) | |||||||
| δ13C (‰VPDB) | 1 | ||||||
| δ18O (‰VPDB) | 0.9 | 1 | |||||
| Mn (ppm) | −0.71 | −0.71 | 1 | ||||
| Fe (ppm) | −0.51 | −0.43 | 0.61 | 1 | |||
| Sr (ppm) | [0.21] | [0.18] | [−0.42] | [−0.02] | 1 | ||
| Mean CL intensity (MCLI: 0–255) | −0.53 | −0.54 | 0.77 | [0.34] | [−0.23] | 1 | |
| Altered fiber and puncta-filling cement ratio (AF-PCR: %) | −0.75 | −0.76 | 0.75 | 0.6 | [−0.15] | 0.61 | 1 |
| Fossil T. coreanica (n = 22) | |||||||
| δ13C (‰VPDB) | 1 | ||||||
| δ18O (‰VPDB) | 0.9 | 1 | |||||
| Mn (ppm) | −0.77 | −0.72 | 1 | ||||
| Fe (ppm) | [−0.48] | [− 0.35] | 0.54 | 1 | |||
| Sr (ppm) | 0.54 | 0.55 | −0.68 | [− 0.19] | 1 | ||
| Mean CL intensity (MCLI: 0–255) | −0.65 | −0.64 | 0.80 | [0.20] | −0.47 | 1 | |
| Altered fiber and puncta-filling cement ratio (AF-PCR: %) | −0.79 | −0.81 | 0.77 | 0.62 | [−0.44] | 0.63 | 1 |
| Fossil L. rubellus (n = 14) | |||||||
| δ13C (‰VPDB) | 1 | ||||||
| δ18O (‰VPDB) | 0.91 | 1 | |||||
| Mn (ppm) | [−0.65] | − 0.72 | 1 | ||||
| Fe (ppm) | [−0.57] | [− 0.56] | 0.76 | 1 | |||
| Sr (ppm) | [−0.15] | [− 0.20] | [− 0.16] | [0.17] | 1 | ||
| Mean CL intensity (MCLI: 0–255) | [−0.32] | [−0.37] | 0.69 | [0.62] | [0.05] | 1 | |
| Altered fiber and puncta-filling cement ratio (AF-PCR: %) | −0.71 | − 0.71 | 0.71 | [0.57] | [0.31] | [0.55] | 1 |
