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Table 3 Summary of all samples’ parameters

From: (U–Th)/He thermochronometric mapping across the northeast Japan Arc: towards understanding mountain building in an island-arc setting

Sample
(“A02-”)
Tectonic unitsGeologyE-lon.
(°)
N-lat.
(°)
Elevation
(m asl.)
Weighted mean age
± 95% CI (Ma)
Tc of AHe
(°C)
Grad.a
(°C/km)
Grad.b
(°C/km)
dD/dta (mm/year)dD/dtb (mm/year)
AHeZHe
FST03Back-arcCrGr139.9540040.45519483.2 ± 0.221.3 ± 3.368.8 ± 10.350 ± 1045 ± 50.37 ± 0.110.41 ± 0.10
FST04Back-arcCrGr140.3478139.74967167N/A83.9 ± 8.3
FST05Back-arcCrGr140.5480839.734441964.9 ± 0.89.9 ± 1.068.0 ± 12.450 ± 1055 ± 50.24 ± 0.080.21 ± 0.06
FST06OBRCrGr140.8303339.597974876.2 ± 0.6N/A64.2 ± 2.150 ± 1055 ± 50.18 ± 0.040.16 ± 0.02
FST07Fore-arcCrGr141.2526939.4517232188.6 ± 8.850.7 ± 10.730 ± 1045 ± 50.02 ± 0.010.01 ± 0.00
FST08Fore-arcCrGr141.6979239.3521750743.7 ± 4.354.5 ± 10.330 ± 1035 ± 50.03 ± 0.010.03 ± 0.01
FST09Fore-arcCrGr141.9476939.4033313145.0 ± 4.556.4 ± 20.030 ± 1035 ± 50.03 ± 0.020.03 ± 0.01
FST10OBRCrGr140.8986739.221285950.9 ± 0.1N/A78.3 ± 8.650 ± 1055 ± 51.44 ± 0.431.31 ± 0.32
FST11OBRCrGr140.8549739.478284115.1 ± 0.514.7 ± 2.368.8 ± 1.950 ± 1045 ± 50.23 ± 0.050.26 ± 0.04
FST12OBRCrGr140.4984239.099862683.7 ± 0.417.2 ± 2.770.2 ± 6.550 ± 1065 ± 50.33 ± 0.080.25 ± 0.04
  1. E-lon. and N-lat. indicate the east longitude and the north latitude of every sample. Weighted mean ages are from Tables 2 and 3, calculated from single grain ages of each sample with IsoplotR (Vermeesch 2018). Ages in parentheses are average ages indicating that weighted mean ages were not adopted because of less reproducibility. Tc denotes the closure temperature of the AHe system based on the Dodson (1973)’s method. Grad.: Geothermal gradients
  2. aUsing the database of Tanaka et al. (2004)
  3. bUsing the layer data of GSJ (2009). dD/dt shows the mean denudation rates since the apparent AHe ages. CrGr Cretaceous granite. OBR Ou Backbone Range. N/A denotes a weighted mean age was not adopted because of a poor reproducibility