Archeointensity estimates of a tenth-century kiln: first application of the Tsunakawa–Shaw paleointensity method to archeological relics

Earth, Planets and Space

Table 6 Acceptable results of the Tsunakawa–Shaw experiment

Specimen	NRM₀ (A/m)	MAD_N (°)	ARM0₀ (A/m)	MDF_A0 (mT)	LTD (%)	First heating					Second heating					H_past (μT)
Specimen	NRM₀ (A/m)	MAD_N (°)	ARM0₀ (A/m)	MDF_A0 (mT)	LTD (%)	Slope_A0	Slope_N	f _N	r _N	ΔAIC_N	Slope_A1	Slope_T	f _T	r _T	ΔAIC_T	H_past (μT)
BH1J	1.21	0.8	0.394	35	2.1	0.989	1.07	0.959	0.998	37.2	1.03	1.01	1.01	1.00	8.43	53.3
BH2K	2.24	0.8	1.03	39	3.5	1.05	0.931	0.980	0.999	14.4	1.00	0.993	1.00	1.00	− 1.97	46.5
BH4N	0.541	1.1	0.281	36	2.6	1.00	0.938	0.970	1.00	− 0.81	0.997	0.998	0.999	1.00	− 0.21	46.9
BH6D	1.21	1.1	0.617	39	5.1	0.996	0.950	0.755	0.999	29.4	1.01	0.992	0.997	1.00	7.41	47.5
BH6E	1.09	1.1	0.631	41	2.4	1.03	0.857	0.914	0.999	38.3	1.00	0.979	0.938	0.999	− 1.83	42.8
BH7K	1.55	0.6	0.805	40	3.0	1.07	0.964	0.763	1.00	− 0.04	1.01	0.978	0.749	1.00	4.81	48.2
BH8L	3.54	0.6	1.60	42	2.2	1.19	1.01	0.859	0.996	33.1	0.993	1.02	0.995	1.00	1.48	50.3
BH8M	2.64	0.6	1.11	44	3.2	1.07	0.991	0.935	0.998	56.5	1.01	1.01	0.959	1.00	17.2	49.6
Average (H_past) = 48.1 ± 3.1

NRM₀, the initial NRM intensity before LTD; MAD_N, the maximum angler deviation of NRM; ARM₀₀, the initial ARM₀ intensity before LTD; MDF_A0, the median destructive field of ARM0; LTD (%), the low-temperature demagnetized fraction of ARM0; Slope_A0, slopes of ARM spectra for coercivity in the ARM0–ARM1 diagrams; Slope_N, slopes of the linear segments in the NRM-TRM1* diagrams; f_N is the NRM fractions of the linear NRM-TRM1* segments; r_N, correlation coefficients of the linear NRM-TRM1* segments; ΔAIC_N, the AIC difference between the linear and quadratic fit of NRM-TRM1* diagrams; Slope_A1, slopes of ARM spectra for Hc in the ARM0–ARM1 diagrams; Slope_T, slopes of the linear segments in the TRM1–TRM2* diagrams; f_T, the TRM1 fractions of the linear TRM1–TRM2* segments; r_T, correlation coefficients of the linear TRM1–TRM2* segments; ΔAIC_T, the AIC difference between linear and quadratic fit of TRM1–TRM2* diagrams; H_past, the estimated paleointensity