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Table 1 Parameters of apatite (U–Th–Sm)/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.No. of grains analyzed[4He] (ncc)Mass
(mg)
aMean FT[U]
(ppm)
[Th]
(ppm)
[Sm]
(ppm)
Th/Ub[eU]
(ppm)
Corrected age ± 1σ
(Ma)
Grain length
(µm)
Grain half width
(μm)
cMWARdSDeGrain morphology
FST03123443846510.0280.00300.697.923.4311.72.9514.88.0 ± 0.5 g138.046.50T
FST03123453846810.0300.00190.6514.424.0200.81.6620.910.1 ± 0.6 g114.540.30T
FST03124663874620.0270.00370.6619.847.8231.72.4132.12.9 ± 0.2147.342.73.42 × 1T
FST03124673874930.0230.00470.627.117.3191.92.4212.05.7 ± 0.4 g137.336.33.82T, 1T, 0T
FST03200856597110.0170.00160.6225.140.7141.11.6235.34.1 ± 0.3131.934.60T
FST03200876597710.1120.00160.624.313.2121.63.067.9121.8 ± 7.6 g118.236.80T
FST03204346779010.0250.00430.7413.522.8181.11.6819.73.4 ± 0.2131.057.40T
FST03204356779310.0130.00340.7110.324.1182.12.3516.82.8 ± 0.2120.952.80T
Weighted mean age ± 95% CI 3.2 ± 0.2
FST04123473847410.0720.00290.6930.724.7210.80.8037.48.1 ± 0.5169.441.10T
FST04123483847710.0840.00260.6720.215.5185.60.7724.716.5 ± 1.0173.342.52T
FST04123493848010.0240.00280.6726.020.7205.90.8031.83.4 ± 0.2187.042.52T
FST04123503848310.0400.00370.7217.618.5172.61.0522.75.6 ± 0.3165.846.90T
FST04200886598010.0460.00490.7423.326.2171.71.1230.23.6 ± 0.2194.549.90T
FST04200896598310.2070.00480.7435.729.2171.40.8243.311.3 ± 0.7198.648.80T
FST04200906598610.1240.00320.7263.857.9414.10.9179.35.7 ± 0.4200.347.81T
FST04204376779910.0750.00510.7512.614.9125.01.1816.79.9 ± 0.6139.160.20T
FST04204386780210.1030.00350.7121.922.1157.11.0127.812.6 ± 0.8186.243.10T
FST04204396780510.0510.00290.7020.223.2166.11.1526.47.9 ± 0.5135.746.30T
Weighted mean age ± 95% CI N/A
FST05123523848910.0300.00310.677.423.9282.03.2414.38.8 ± 0.5 g162.947.82T
FST05123543849510.1040.00580.745.512.7302.42.329.922.6 ± 1.4 g195.059.62T
FST05124693875520.0290.00470.678.019.5261.82.4213.85.7 ± 0.4149.744.24.91T,0T
FST05124703875820.0620.00710.7316.929.1228.81.7224.84.1 ± 0.3138.552.011.51T, 0T
FST05124713876120.0340.01020.772.315.7242.56.877.15.6 ± 0.3167.668.412.12 × 1T
Weighted mean age ± 95% CI 4.9 ± 0.8
FST06123553849810.0460.00290.7125.719.4173.10.7531.06.1 ± 0.4196.045.81T
FST06123563850110.0620.00720.729.64.8125.70.4911.39.0 ±0.6 g184.643.60T
FST06123573850410.0740.00400.7332.124.2158.20.7538.55.4 ± 0.3183.746.70T
FST06124723876420.0530.00480.6716.111.2152.10.7019.47.2 ± 0.4148.044.10.62 × 2T
FST06124733876720.0710.00840.7213.07.0139.90.5415.36.4 ± 0.4198.049.29.72 × 2T
Weighted mean age ± 95% CI 6.2 ± 0.6
FST07123593851011.3070.00400.7737.110.9476.10.2941.885.1 ± 5.3162.863.51T
FST07123603851311.7670.00780.7822.78.6298.90.3826.193.7 ± 5.8198.068.92T
FST07123613877012.6250.00690.8140.514.2481.00.3546.087.2 ± 5.4204.472.91T
FST07123623877310.7720.00290.7330.410.6450.80.3535.089.3 ± 5.5181.748.41T
Weighted mean age ± 95% CI 88.6 ± 8.8
FST08123633877610.7700.00680.7619.228.5148.71.4926.646.7 ± 2.9217.161.62T
FST08123643877910.3740.00430.7116.722.6144.31.3522.745.3 ± 2.8211.849.42T
FST08123653878210.5040.00520.7319.825.9138.51.3126.542.1 ± 2.6204.455.12T
FST08123663878510.9320.00840.7820.033.9162.61.7028.741.4 ± 2.6188.473.32T
Weighted mean age ± 95% CI 43.7 ± 4.3
FST09123673878810.1130.00500.743.67.072.91.985.647.5 ± 2.9178.252.80T
FST09123683879110.3700.00880.816.513.9211.02.1210.742.1 ± 2.6207.983.41T
FST09123693879410.1530.00560.753.98.476.02.166.250.7 ± 3.1190.753.90T
FST09123703879710.4570.01860.843.68.572.82.325.942.1 ± 2.6220.791.60T
Weighted mean age ± 95% CI 43.7 ± 4.3
FST10123723880310.0240.00690.7515.776.6128.44.8734.21.1 ± 0.1209.863.12T
FST10125753892360.0350.02040.6912.125.592.22.1118.51.1 ± 0.1187.646.34.46 × 2T
FST10125773892960.0410.02930.7213.728.2103.42.0620.80.8 ± 0.0211.251.86.26 × 2T
Weighted mean age ± 95% CI 0.9 ± 0.1
FST11125793893530.1970.00380.7575.874.6423.80.9895.26.1 ± 0.4169.452.85.81 × 1T, 2 × 0T
FST11125803893830.1550.00660.7546.364.6317.01.4062.94.2 ± 0.3232.955.214.02 × 2T, 1 × 1T
FST11125813894130.2100.00520.7576.642.8287.70.5687.95.1 ± 0.3174.352.96.53 × 2T
FST11125823894430.1970.00480.7462.564.7350.31.0479.35.9 ± 0.4164.356.76.22 × 2T, 1 × 1T
Weighted mean age ± 95% CI 5.1 ± 0.5
FST12125833894730.0330.00350.7519.530.5502.51.5628.93.7 ± 0.2157.155.14.82 × 2T, 1 × 1T
FST12125843895030.0450.00710.7612.925.1447.91.9420.83.5 ± 0.2218.766.74.12 × 2T, 1 × 0T
FST12125853895330.0330.00360.6819.536.7643.11.8831.03.8 ± 0.2221.551.68.12 × 2T, 1 × 1T
FST12125863895630.0390.00550.7315.026.1454.81.7423.23.6 ± 0.2214.655.91.33 × 2T
Weighted mean age ± 95% CI 3.7 ± 0.4
Sample codeLab. No.He No.[4He] (ncc)aMean FTTh/UCorrected age ± 1σ (Ma)
Durango Apatite standard
DUR197686552313.1351.0016.1231.0 ± 1.9
DUR19771658534.9851.0022.2832.3 ± 2.0
DUR19772658563.5671.0016.2431.6 ± 2.0
DUR19769656322.8171.0021.8531.8 ± 2.0
DUR20105661815.1891.0023.3231.7 ± 2.0
DUR201776629118.4201.0022.2930.0 ± 1.9
DUR20430676328.4401.0019.3231.8 ± 2.0
DUR20473678382.7251.0016.3331.8 ± 2.0
Reference agef ± 1σ 32.1 ± 1.7
  1. N/A denotes a weighted mean age was not adopt because of a poor reproducibility
  2. aFT is the a-ejection correction after Farley et al. (1996)—calculated using mass-weighted radius, where more than one grain was analyzed
  3. bEffective uranium content (U ppm + 0.234 * Th ppm + 0.0046 * Sm ppm) (Gastil et al. 1967)
  4. cMWAR is the mass-weighted average radius of apatite crystals analyzed
  5. dStandard deviation of the MWAR is used as a guide for the ‘tightness’ of the range of single crystal radii picked within a sample
  6. eGrain morphology: 0T = no crystal terminations, 1T = one crystal termination and 2T = two crystal terminations (Brown et al. 2013)
  7. fReference age for Durango apatite after McDowell et al. (2005)
  8. gGrain age is regarded as an outlier