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Table 2 Concentrations and isotopic ratios of micrometeorites collected from Antarctic snow

From: Mineralogy and noble gas isotopes of micrometeorites collected from Antarctic snow

Sample ID (weight) Temperature (°C) 4He 3He/4He 22Ne 20Ne/22Ne 21Ne/22Ne 36Ar 38Ar/36Ar 40Ar/36Ar 84Kr 132Xe
D03IB067 400 470 0.00023 ± 0.00012 0.100 13 ± 11 ND 4.53 0.184 ± 0.062 215 ± 44 0.024 0.010
(0.1 μg) 650 19,700 0.000240 ± 0.000017 7.18 11.77 ± 0.40 0.0258 ± 0.0094 13.0 0.204 ± 0.044 125 ± 40 0.122 ND
  1800 8470 0.000227 ± 0.000022 20.0 11.45 ± 0.33 0.0307 ± 0.0087 39.9 0.201 ± 0.013 214.5 ± 9.4 0.395 0.048
Total   28,640 0.000236 ± 0.000014 27.3 11.54 ± 0.27 0.0294 ± 0.0068 57.4 0.200 ± 0.014 194 ± 12 0.541 0.058
D03IB068 400 88.0 ND ND ND ND 6.38 0.193 ± 0.066 223 ± 31 0.098 0.019
(0.1 μg) 650 691 0.00040 ± 0.00015 3.56 12.33 ± 1.18 0.028 ± 0.012 8.85 0.221 ± 0.064 216 ± 40 0.089 0.007
  1800 1020 0.000450 ± 0.000060 3.93 11.78 ± 0.79 0.040 ± 0.020 33.9 0.187 ± 0.011 227.4 ± 9.7 0.400 0.059
Total   1799 0.000429 ± 0.000068 7.49 12.04 ± 0.70 0.035 ± 0.012 49.1 0.194 ± 0.016 225 ± 11 0.587 0.085
D10IB020 400 1.16 ND ND ND ND 2.51 0.229 ± 0.084 195 ± 58 0.006 0.005
(0.2 μg) 650 247 0.00026 ± 0.00016 0.257 9.9 ± 4.0 ND 3.85 0.186 ± 0.054 153 ± 60 0.031 ND
  1800 3270 0.000249 ± 0.000015 9.49 11.41 ± 0.37 0.0255 ± 0.0058 41.3 0.1926 ± 0.0056 236.3 ± 5.9 0.800 0.111
Total   3518 0.000250 ± 0.000018 9.75 11.37 ± 0.37 0.0255 ± 0.0058 47.7 0.1940 ± 0.0079 227.4 ± 7.6 0.836 0.116
D10IB049 400 ND ND ND ND ND 1.60 0.154 ± 0.071 294 ± 43 0.028 0.009
(0.3 μg) 650 32.2 ND 0.279 14.2 ± 2.8 ND 3.15 0.173 ± 0.059 150 ± 47 0.042 0.002
  1800 303 0.000385 ± 0.000077 6.83 11.63 ± 0.53 0.0250 ± 0.0031 21.1 0.190 ± 0.010 188.0 ± 7.6 0.276 0.038
Total   335 0.000385 ± 0.000077 7.11 11.73 ± 0.52 0.0250 ± 0.0031 25.9 0.185 ± 0.012 189.8 ± 8.9 0.345 0.050
D10IB130 400 2.40 ND ND ND ND 6.19 0.173 ± 0.051 242 ± 28 0.023 0.022
(0.1 μg) 650 1120 0.00068 ± 0.00014 5.30 12.79 ± 0.71 0.0236 ± 0.0081 12.5 0.190 ± 0.027 93 ± 49 0.064 ND
  1800 3180 0.000900 ± 0.000035 34.5 12.84 ± 0.32 0.0291 ± 0.0036 57.4 0.187 ± 0.013 140 ± 12 0.322 0.063
Total   4302 0.000844 ± 0.000046 39.8 12.83 ± 0.29 0.0284 ± 0.0033 76.1 0.186 ± 0.011 141 ± 12 0.409 0.084
D03IB057 400 ND ND ND ND ND 5.45 0.16 ± 0.11 238 ± 39 0.017 0.014
(0.1 μg) 650 ND ND ND ND ND 4.84 0.22 ± 0.10 137 ± 101 0.109 0.006
  1800 28.0 ND 2.06 10.14 ± 0.95 0.029 ± 0.023 41.1 0.182 ± 0.015 266.3 ± 8.8 0.807 0.118
Total   28.0   2.06 10.14 ± 0.95 0.029 ± 0.023 51.4 0.184 ± 0.019 251 ± 13 0.933 0.138
D10IB170 400 ND ND ND ND ND 5.34 0.202 ± 0.073 236 ± 36 0.088 0.018
(0.1 μg) 650 ND ND 0.245 10.4 ± 7.2 ND 6.86 0.218 ± 0.057 190 ± 50 0.098 0.012
  1800 19.5 ND 4.53 10.88 ± 0.77 0.025 ± 0.014 24.2 0.196 ± 0.016 241 ± 11 0.248 0.041
Total   19.5   4.78 10.85 ± 0.81 0.025 ± 0.014 36.4 0.201 ± 0.018 231 ± 13 0.434 0.071
  1. Concentrations are shown in 10−6 cm3 standard temperature and pressure (STP)/g. Uncertainties for gas abundance (cm3 STP) were calculated to be ~10 % considering the stability of sensitivities and variation of background levels of the mass spectrometer
  2. ND values not determined due to low gas abundances