The effects of meteoric diagenesis on the geochemical composition and microstructure of Pliocene fossil Terebratalia coreanica and Laqueus rubellus brachiopod shells from northeastern Japan

Progress in Earth and Planetary Science

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