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 |