Thermochronology of hydrothermal alteration zones in the Kii Peninsula, southwest Japan: an attempt for detecting the thermal anomalies and implications to the regional exhumation history

Sueoka, Shigeru; Iwano, Hideki; Danhara, Tohru; Niwa, Masakazu; Kanno, Mizuho; Kohn, Barry P.; Kawamura, Makoto; Yokoyama, Tatsunori; Kagami, Saya; Ogita, Yasuhiro; Hirata, Takafumi

doi:10.1186/s40623-023-01921-5

Earth, Planets and Space

Table 5 Summary of age clusters of ZFT data

From: Thermochronology of hydrothermal alteration zones in the Kii Peninsula, southwest Japan: an attempt for detecting the thermal anomalies and implications to the regional exhumation history

Sample code	n	Central age ± 1σ [Ma]	MSWD	P(χ²)	Dispersion ± 95%CI [%]			Cluster 1 ± 1σ [Ma]	Cluster 2 ± 1σ [Ma]	Cluster 3 ± 1σ [Ma]
HJG1-F	30	24.54 ± 3.89	26	0	83.50	+ 29.6	− 20	22.96 ± 0.93		127.30 ± 8.68
HJG1-0-5 cm	30	37.06 ± 4.61	28	0	65.8	+ 22.0	− 15	22.86 ± 1.30	53.98 ± 2.57	113.03 ± 4.07
HJG1-5-10 cm	30	27.55 ± 2.66	17	0	50.2	+ 17.3	− 12	16.59 ± 1.04	38.34 ± 1.19	122.4 ± 10.8
HJG1-0 m	28	26.53 ± 1.92	6.2	0	34.40	+ 13.65	− 9.3	23.48 ± 0.91	44.99 ± 2.87
HJG1-1 m	30	33.71 ± 2.36	9.9	0	34.99	+ 12.63	− 8.5	26.70 ± 1.37	39.48 ± 2.22	90.36 ± 6.19
HJG1-3 m	30	28.21 ± 1.76	5.5	0	29.98	+ 11.68	− 8.1	25.40 ± 0.86	48.01 ± 2.48
HJG1-10 m	30	26.85 ± 2.30	11	0	43.8	+ 15.3	− 10	26.35 ± 0.75		166.0 ± 21.3
HJG1-20 m	30	25.28 ± 2.07	8.4	0	40.6	+ 14.9	− 10	20.83 ± 1.55	43.62 ± 3.86
HJG2-F	30	33.42 ± 2.90	15	0	44.2	+ 15.8	− 11	27.18 ± 1.05	45.62 ± 1.79	96.47 ± 5.36
HJG2-0-5 cm	30	29.84 ± 3.91	31	0	69.6	+ 23.2	− 15	26.82 ± 0.80		103.28 ± 4.31
HJG2-5-10 cm	30	38.16 ± 4.29	28	0	59.6	+ 19.9	− 13	30.88 ± 0.99		91.15 ± 3.14
HJG2-0 m	30	24.13 ± 1.84	6.7	0	37.55	+ 14.20	− 9.7	26.63 ± 0.80
HJG2-1 m	30	28.63 ± 2.19	6.9	0	37.65	+ 14.19	− 9.7	24.61 ± 1.13	49.29 ± 3.08
HJG2-3 m	30	25.38 ± 1.26	2.6	3.4E-06	20.72	+ 10.29	− 7.8	26.49 ± 0.80
HJG2-10 m	30	29.49 ± 2.75	12	0	47.7	+ 16.8	− 11	21.27 ± 1.00	46.24 ± 1.96	116.6 ± 12.4
HJG4-0 m	30	24.18 ± 1.31	2.9	2.1E-07	22.98	+ 10.93	− 8.1	25.03 ± 0.80
HJG4-1 m	30	28.27 ± 2.17	8.4	0	38.15	+ 14.26	− 9.6	26.04 ± 0.82		76.34 ± 5.52
HJG4-3 m	30	26.42 ± 1.55	4.3	8.2E-14	27.33	+ 11.50	− 8.1	23.61 ± 0.92	41.42 ± 2.68
HJG4-10 m	30	24.28 ± 1.85	9.3	0	38.37	+ 13.77	− 9.3	23.15 ± 0.65		59.75 ± 3.94

The parameters were calculated using IsoplotR (Vermeesch 2018). [MSWD, mean square weighted deviation; P(χ²), the p-value of a chi-square probability for homogeneity; 95%CI, 95% confidence interval]

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