Table 2.

The μ¹⁰⁰ Ru values for chromitites and Os-Ir-Ru alloys. Data are corrected using the Nier reduction method unless otherwise specified. The uncertainties associated with individual analyses are the internal error (2SE) associated with the measurement, unless there is only one analysis for the sample in which case the uncertainties are the 2SD of the standards measured during the relevant campaign. The uncertainties for sample means, where n < 3, are reported as the 2SD of the Alfa Asear standard, or the sample, whichever was greater. The uncertainties for sample means, where n ≥ 3, are the 2SE associated with the multiple measurements of the sample. The uncertainties associated with the IAB iron meteorite group are defined by the extent of the error envelop at μ¹⁸⁹Os = 0 for the trend μ¹⁸⁹Os vs. μ¹⁰⁰ Ru, obtained using the ISOPLOT program (Ludwig, 2003). The uncertainties associated with the oceanic mantle are an average of the 2SD of repeated analysis of the Alfa Asear standard from each measurement campaign.

Location/Sample	μ100Ru	±
SOC (UK)
C1	4.0	9.0
C2	4.0	9.0
C3_a	−1.4	5.4
C3_b	−0.1	6.8
C3_c	−1.4	2.7
C3_d	1.3	5.4
C3mean	−0.4	1.3
JOC (US)
M3_6	7.4	6.8
M8_02	−4.5	6.8
L5_3_a	2.6	5.8
L5_3_b	−3.7	5.4
L5_3_c	−5.4	6.7
L5_3_d	1.5	3.9
L5_3_e	2.6	8.1
L5_3mean	−0.5	3.4
Witwatersrand (SA)
B-1_a	0.3*	2.5*
B-1_b	0.4*	3.7*
B-1_c	4.1*	3.3*
B-1_d	1.5*	3.3*
B-1_e	−1.1*	3.0*
B-1_f	−4.4*	3.2*
B-1_g	1.8*	3.4*
B-1mean	0.4*	2.0*
Urals (RU)
Kushva_a	−4.4	5.1
Kushva_b	2.4	3.1
Kushva_c	10.0	3.4
Kushva mean	2.7	10.9
Nizhny Tagil_a	14.9	6.3
Nizhny Tagil_b	3.2	5.0
Nizhny Tagilmean	9.1	7.5
Guli_a	4.3*	6.5*
Guli_b	−4.8*	4.7*
Guli_c	3.9*	3.5*
Guli_d	2.8*	4.0*
Gulimean	1.6*	3.9*
Tasmania (AU)
Bald Hills	−7.8	8.6
Savage River	−6.8	8.6
Papua New Guinea
Yodda_a	1.5	3.3
Yodda_b	6.5	3.3
Yodda_c	4.1	4.7
Yoddamean	4.1	2.9
IAB (MG,sLL)	0.9	3.0
Oceanic mantle	1.2	7.2

^*Data obtained using the measured oxygen reduction scheme.