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Table 3 Summary of apatite (U–Th–Sm)/He analytical data

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

Sample Lab. no He no. No. of grains analyzed [4He]
(ncc)
Mass
(mg)
aMean F T [U]
(ppm)
[Th]
(ppm)
[Sm]
(ppm)
Th/U b[eU]
(ppm)
Corrected age ± 1σ
(Ma)
Grain length
(μm)
cGrain radius
(μm)
dGrain morphology
A02-ST01 10297 30458 1 0.538 0.0044 0.75 20.2 26.8 151.7 1.33 26.5 50.1 ± 3.1 204.4 56.3 1T
A02-ST01 10294 30627 1 0.455 0.0047 0.71 16.3 24.3 135.3 1.49 22.0 50.6 ± 3.1 237.9 48.6 2T
A02-ST01 10295 30630 1 0.647 0.0063 0.72 17.1 29.3 155.7 1.71 24.0 48.5 ± 3.0 302.4 49.9 2T
A02-ST01 10296 30633 1 0.547 0.0041 0.74 23.0 27.8 151.2 1.21 29.5 49.4 ± 3.1 205.6 54.0 1T
           Weighted mean age ± 95% CI 49.6 ± 3.0    
A02ST02 14733 47678 1 1.130 0.0059 0.78 31.5 2.2 271.7 0.07 32.0 62.1 ± 3.8 158.0 67.2 2T
A02ST02 14734 47681 1 0.449 0.0038 0.75 21.3 2.3 248.1 0.11 21.8 58.4 ± 3.6 141.3 51.8 0T
A02ST02 14735 47684 1 0.827 0.0036 0.73 34.0 3.6 274.1 0.11 34.8 72.1 ± 4.5 143.9 55.2 2T
A02ST02 14736 47687 1 0.545 0.0039 0.74 21.9 2.8 193.2 0.13 22.6 67.9 ± 4.2 157.0 54.8 2T
           Weighted mean age ± 95% CI 64.3 ± 9.5    
A02-ST03 10298 30461 1 0.334 0.0046 0.70 12.2 20.1 173.7 1.65 16.9 49.9 ± 3.1 240.0 47.8 2T
A02-ST03 10299 30464 1 0.560 0.0029 0.69 6.4 15.0 143.2 2.34 9.9 e224.8 ± 13.9 151.1 43.7 0T
A02-ST03 10300 30467 1 1.097 0.0094 0.80 10.3 18.3 182.9 1.78 14.6 79.8 ± 4.9 268.2 71.8 1T
A02-ST03 10301 30470 1 0.230 0.0021 0.63 20.6 20.9 170.8 1.01 25.5 55.6 ± 3.5 160.8 39.4 2T
A02-ST03 15680 51164 1 0.220 0.0045 0.74 5.7 14.0 133.9 2.46 9.0 59.1 ± 3.7 128.5 59.1 2T
A02-ST03 15681 51167 1 0.459 0.0019 0.66 29.6 20.2 158.1 0.68 34.3 86.5 ± 5.4 107.1 42.0 2T
A02-ST03 15682 51170 1 0.450 0.0028 0.70 17.4 25.5 183.0 1.47 23.4 78.7 ± 4.9 124.5 47.6 2T
           Weighted mean age ± 95% CI 63 ± 15    
A02-ST04 10302 30473 1 0.158 0.0085 0.79 11.0 26.0 214.8 2.36 17.1 11.1 ± 0.7 176.3 69.4 0T
A02-ST04 10303 30476 1 0.053 0.0058 0.76 9.3 16.0 194.0 1.72 13.1 e7.5 ± 0.5 155.9 60.9 0T
A02-ST04 10305 30482 1 0.031 0.0032 0.70 6.2 18.0 253.2 2.90 10.4 10.4 ± 0.6 153.3 45.8 0T
A02-ST04 10363 30663 2 0.052 0.0007 0.72 49.8 78.7 1420.0 1.58 68.3 12.6 ± 0.8 119.0 51.6 0T, 0T
A02-ST04 10364 30666 2 0.067 0.0073 0.71 7.3 8.6 142.3 1.18 9.3 11.0 ± 0.7 185.5 45.6 0T, 0T
           Weighted mean age ± 95% CI 11.2 ± 1.4    
A02-ST05 10306 30485 1 0.027 0.0047 0.72 38.3 25.0 159.0 0.65 44.2 1.5 ± 0.1 223.6 50.1 2T
A02-ST05 10307 30488 1 0.038 0.0083 0.77 28.0 20.0 138.5 0.71 32.7 1.5 ± 0.1 251.8 62.9 2T
A02-ST05 10308 30491 1 0.024 0.0046 0.72 30.4 28.5 198.4 0.94 37.1 1.6 ± 0.1 203.5 52.4 2T
A02-ST05 10309 30494 1 0.033 0.0048 0.72 47.7 35.9 203.8 0.75 56.1 1.4 ± 0.1 226.1 50.4 2T
           Weighted mean age ± 95% CI 1.5 ± 0.1    
A02-ST06 10310 30497 1 0.043 0.0036 0.70 48.7 84.9 470.9 1.74 68.7 2.1 ± 0.1 161.1 51.6 2T
A02-ST06 10360 30654 1 0.020 0.0034 0.73 14.0 37.3 589.3 2.66 22.8 2.8 ± 0.2 172.8 54.5 1T
A02-ST06 10361 30657 1 0.058 0.0040 0.71 5.4 14.1 150.6 2.61 8.7 e18.6 ± 1.2 135.1 54.2 0T
A02-ST06 15685 51179 1 0.053 0.0027 0.72 6.8 4.7 190.5 0.69 7.9 e27.8 ± 1.7 153.7 52.0 1T
A02-ST06 15915 51501 2 0.022 0.0071 0.74 6.9 10.7 192.1 1.55 9.4 3.5 ± 0.2 184.1 51.9 1T, 1T
           Weighted mean age ± 95% CI 2.5 ± 1.7    
A02-ST07 10314 30509 1 0.078 0.0076 0.78 8.4 11.5 97.4 1.37 11.1 9.6 ± 0.6 182.7 64.4 0T
A02-ST07 10315 30512 1 0.234 0.0065 0.78 26.6 44.6 225.3 1.68 37.1 10.2 ± 0.6 242.4 62.3 1T
A02-ST07 10316 30515 1 0.111 0.0050 0.74 15.5 31.7 117.5 2.05 22.9 10.6 ± 0.7 173.6 53.6 0T
A02-ST07 10317 30518 1 0.055 0.0046 0.74 8.1 16.3 146.7 2.01 11.9 10.8 ± 0.7 231.6 53.3 1T
           Weighted mean age ± 95% CI 10.3 ± 0.6    
A02-ST08 10318 30521 1 0.043 0.0042 0.70 12.8 22.5 197.2 1.76 18.1 6.5 ± 0.4 223.5 47.8 2T
A02-ST08 10319 30524 1 0.042 0.0038 0.73 12.9 22.9 201.7 1.78 18.3 6.6 ± 0.4 216.8 50.1 1T
A02-ST08 10320 30527 1 0.059 0.0040 0.72 14.6 29.0 251.9 1.99 21.4 7.7 ± 0.5 245.1 47.6 1T
A02-ST08 10321 30642 1 0.032 0.0045 0.72 8.7 15.1 154.1 1.74 12.2 6.5 ± 0.4 191.8 53.1 2T
           Weighted mean age ± 95% CI 6.8 ± 0.9    
A02-ST09 10322 30537 1 0.055 0.0022 0.68 21.7 29.6 275.9 1.36 28.7 10.3 ± 0.6 166.3 44.1 1T
A02-ST09 10323 30540 1 0.030 0.0010 0.55 26.1 37.7 500.5 1.44 35.0 12.1 ± 0.8 105.8 34.5 2T
A02-ST09 10325 30546 1 0.034 0.0024 0.68 10.6 21.3 183.6 2.01 15.6 11.0 ± 0.7 114.5 45.5 0T
A02-ST09 10378 30690 2 0.023 0.0037 0.62 6.1 18.8 187.6 3.08 10.5 e7.7 ± 0.5 136.8 36.7 0T, 0T
           Weighted mean age ± 95% CI 11.1 ± 2.3    
A02ST12 14741 47702 1 0.126 0.0067 0.77 13.1 14.7 134.8 1.12 16.6 12.0 ± 0.7 210.1 56.2 0T
A02ST12 14742 47705 1 0.193 0.0049 0.77 16.0 4.6 109.0 0.29 17.1 e24.4 ± 1.5 132.8 60.8 0T
A02ST12 14743 47708 1 0.245 0.0096 0.81 20.1 7.9 135.6 0.39 22.0 11.8 ± 0.7 207.3 67.8 0T
A02ST12 14744 47711 1 0.213 0.0090 0.81 21.2 5.6 110.5 0.26 22.5 10.6 ± 0.7 174.0 71.7 0T
           Weighted mean age ± 95% CI 11.4 ± 0.8    
A02-ST13 10326 30549 1 0.041 0.0071 0.77 3.9 7.8 223.0 2.00 5.7 e10.4 ± 0.6 146.2 69.3 0T
A02-ST13 10327 30552 1 0.084 0.0090 0.78 13.5 23.9 433.8 1.77 19.1 5.0 ± 0.3 250.8 59.6 0T
A02-ST13 10328 30555 1 0.067 0.0035 0.73 33.4 42.6 408.2 1.28 43.4 5.0 ± 0.3 195.0 51.1 1T
A02-ST13 10329 30558 1 0.093 0.0089 0.79 14.0 19.2 463.8 1.37 18.5 5.7 ± 0.4 211.3 64.9 0T
           Weighted mean age ± 95% CI 5.2 ± 0.9    
A02-ST15 10330 30561 1 0.086 0.0034 0.74 15.4 51.0 353.1 3.31 27.4 10.1 ± 0.6 148.4 61.6 1T
A02-ST15 10331 30564 1 0.054 0.0057 0.75 5.9 22.5 220.9 3.81 11.2 9.1 ± 0.6 148.4 61.6 0T
A02-ST15 10332 30567 1 0.073 0.0021 0.65 11.3 39.2 280.6 3.47 20.5 e21.4 ± 1.3 174.0 41.1 1T
A02-ST15 10379 30693 2 0.064 0.0054 0.68 7.6 26.6 215.2 3.50 13.9 10.1 ± 0.6 118.6 47.8 0T, 0T
           Weighted mean age ± 95% CI 9.7 ± 0.7    
Durango apatite standard                
Durango 10337 30455 3.937 1.00 15.81 31.2 ± 1.9
Durango 10359 30621 9.678 1.00 15.59 31.7 ± 2.0
Durango 10381 30699 9.738 1.00 17.09 33.8 ± 2.1
           Weighted mean age ± 95% CI 32.2 ± 2.3    
           fReference age ± 1σ: 32.1 ± 1.7    
  1. The weighted mean ages and the errors were obtained using Isoplot ver. 4.15 (Ludwig 2012)
  2. aFT is α-ejection correction after Farley et al. (1996)
  3. bEffective uranium concentration, weights U and Th for their alpha productivity, computed as [U] + 0.235[Th] (Shuster et al. 2006)
  4. cMass-weighted average radius is adopted for multi-grain analysis
  5. dCrystal morphology: 2T = idiomorphic whole grain, 1T = broken crystal with 1 termination, 0T = broken grains with no terminations (Brown et al. 2013)
  6. eAnalysis not included in weighted mean age calculation
  7. fThe reference age of Durango apatite is from McDowell et al. (2005)