First report of (U–Th)/He thermochronometric data across Northeast Japan Arc: implications for the long-term inelastic deformation

Earth, Planets and Space

Table 1 Summary of sample parameters

Sample	Region	Rock type	E-lon. (deg.)	N-lat. (deg.)	Elv. (m asl)	Weighted mean He age ± 95% CI (Ma)		AHe T _c (°C)
Sample	Region	Rock type	E-lon. (deg.)	N-lat. (deg.)	Elv. (m asl)	Apatite	Zircon	AHe T _c (°C)
A02-ST01	AbM	CrGr	140.49643	37.71979	96	49.6 ± 3.0		51.9
A02-ST02	AbM	CrGr	140.67009	37.75609	300	64.3 ± 9.5		51.4
A02-ST03	AbM	CrGr	140.81441	37.78157	172	63 ± 15		50.6
A02-ST04	OBR	CrGr	140.37499	37.79742	282	11.2 ± 1.4	39.6 ± 7.4	62.0
A02-ST05	OBR	CrGr	140.11011	37.80026	620	1.5 ± 0.1	N/A	76.1
A02-ST06	OBR	CrGr	140.34019	37.96475	404	2.5 ± 1.7	N/A	72.1
A02-ST07	AsM	CrGr	139.92652	38.12244	434	10.3 ± 0.6	27.2 ± 3.3	63.8
A02-ST08	OBR	CrGr	140.07998	38.10221	236	6.8 ± 0.9	N/A	64.4
A02-ST09	AsM	CrGr	139.84943	38.21464	456	11.1 ± 2.3	11.0 ± 2.4	58.7
A02-ST12	AsM	CrGr	139.74319	38.24726	245	11.4 ± 0.8		64.4
A02-ST13	AsM	CrGr	139.62478	38.33835	97	5.2 ± 0.9	N/A	68.5
A02-ST15	AsM	CrGr	139.46802	38.36962	44	9.7 ± 0.7	30.7 ± 4.8	63.8

He ages are shown as weighted mean (see also Tables 2, 3). N/A denotes that weighted mean ages were not adopted. AHe T _c is the closure temperature of the AHe system considering the cooling rate of each sample; detailed calculations are shown in the body text
AbM Abukuma Mountains, OBR Ou Backbone Range, AsM Asahi Mountains, CrGr Cretaceous granitoid