Mineralogy and noble gas isotopes of micrometeorites collected from Antarctic snow

Okazaki, Ryuji; Noguchi, Takaaki; Tsujimoto, Shin-ichi; Tobimatsu, Yu; Nakamura, Tomoki; Ebihara, Mitsuru; Itoh, Shoichi; Nagahara, Hiroko; Tachibana, Shogo; Terada, Kentaro; Yabuta, Hikaru

doi:10.1186/s40623-015-0261-8

Earth, Planets and Space

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

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
ND values not determined due to low gas abundances

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