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Table 2 Parameters of zircon (U–Th)/He dating

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

Sample code
(A02-)
Lab. No.He No.[4He] (ncc)Mass
(mg)
aMean FT[U]
(ppm)
[Th]
(ppm)
Th/Ub[eU]
(ppm)
Corrected age ± 1σ
(Ma)
Grain length
(µm)
Grain half width
(μm)
cGrain morphology
FST03131054153936.3380.01060.82234.1126.50.41263.818.4 ± 1.1234.163.22T
FST03131064154212.1250.00840.78300.587.20.49321.048.0 ± 3.0e300.543.62T
FST03131074154510.0380.00690.79211.8105.00.58236.429.4 ± 1.8211.852.52T
FST03131084154812.8510.00540.78188.8100.40.34212.420.9 ± 1.3188.850.22T
FST0313528426638.9610.00580.77294.2127.30.43324.139.0 ± 2.4e226.243.82T
Weighted mean age ± 95% CI 21.3 ± 3.3
FST04131104155144.9230.01110.82259.4117.10.36286.990.6 ± 5.6259.458.62T
FST04131114155443.2030.01000.81249.6113.40.25276.281.9 ± 5.1249.656.72T
FST04131124155742.1560.01100.81289.8105.30.42314.688.0 ± 5.5289.852.72T
FST04131134156043.5890.01610.83314.4124.40.35343.677.5 ± 4.8314.462.22T
Weighted mean age ± 95% CI 83.9 ± 8.3
FST0513114415630.6010.00240.71133.286.11.08153.58.4 ± 0.5133.243.02T
FST0513115415660.4270.00470.76187.491.10.99208.89.7 ± 0.6187.445.62T
FST0513116415690.9630.00380.75164.391.41.23185.810.7 ± 0.7164.345.72T
FST0513117415721.1480.00430.75186.886.60.77207.112.4 ± 0.8186.843.32T
Weighted mean age ± 95% CI 9.9 ± 1.0
FST06131184157511.7010.00730.78265.088.80.25285.96.2 ± 0.4265.044.42T
FST06131194157814.8700.01210.82294.4110.00.23320.311.6 ± 0.7294.455.02T
FST06131204158111.2260.00700.78248.890.80.19270.212.5 ± 0.8248.845.42T
FST06131214181023.0650.00860.79266.996.90.85289.76.2 ± 0.4266.948.52T
Weighted mean age ± 95% CI N/A
FST10131234181611.0570.01200.82274.3116.50.77301.720.4 ± 1.3274.358.22T
FST10131244181916.6440.01660.84293.4135.50.70325.318.4 ± 1.1293.467.72T
FST1013125418229.9930.00960.81222.6124.90.50251.917.3 ± 1.1222.662.52T
FST10131224208911.2040.01070.82685.9720.61.05855.210.1 ± 0.6211.574.62T
FST1013530426695.9070.00760.80570.4341.60.60650.69.9 ± 0.6219.853.52T
Weighted mean age ± 95% CI N/A
FST1113126418253.5940.00810.80220.0111.70.45246.313.0 ± 0.8220.055.92T
FST1113127418283.2020.01000.82226.0126.60.45255.813.9 ± 0.9226.063.32T
FST1113128418316.1540.01040.81262.8110.60.48288.826.9 ± 1.7e262.855.32T
FST1113129418343.8440.00950.81232.4118.30.46260.220.6 ± 1.3232.459.12T
FST1113527426609.0870.01140.81177.086.30.49197.333.2 ± 2.1e285.954.32T
Weighted mean age ± 95% CI 14.7 ± 2.3
FST1213130418371.7550.00870.81217.9119.10.34245.915.3 ± 1.0217.959.62T
FST1213131418404.7360.01120.81286.4107.40.27311.619.7 ± 1.2286.453.72T
FST1213132418431.8650.00750.80221.9105.90.34246.817.7 ± 1.1221.952.92T
FST1213133418463.3160.01010.80290.699.50.48314.041.1 ± 2.5e290.649.82T
FST1213526426577.5140.01390.8192.941.50.45102.643.1 ± 2.7e359.651.22T
Weighted mean age ± 95% CI 17.2 ± 2.7
Fish Canyon Tuff Zircon standard
FCT129274074511.2870.01000.80288.1145.60.51322.328.7 ± 1.8272.552.42T
FCT131474158411.6350.01070.81291.4103.30.51315.629.9 ± 1.9291.451.62T
FCT13459423646.8110.00590.78300.0154.80.52336.428.1 ± 1.7211.747.12T
Reference aged ± 1σ 28.01 ± 0.04
  1. N/A denotes a weighted mean age was not adopted because of poor reproducibility
  2. aFT is the a-ejection correction after Farley et al. (1996)
  3. bEffective uranium concentration (U ppm + 0.235 Th ppm) (Shuster et al. 2006)
  4. cGrain morphology: 0T = no terminations, 1T = one termination, 2T = two terminations (Brown et al. 2013)
  5. dThe reference age for Fish Canyon Tuff zircon after Phillips and Matchan (2013)
  6. eGrain age regarded as an outlier