Table 1.

Silicon isotope data for terrestrial and meteorite samples relative to NBS28 as the bracketing standard

Sample	Group	δ29Si	2 SD	2 SE	δ30Si	2 SD	2 SE	n
BHVO-2	Terrestrial basalt	−0.16	0.08	0.01	−0.31	0.12	0.02	57
Carbonaceous chondrites
Allende	CV3	−0.26	0.07	0.01	−0.52	0.13	0.03	26
Angrites
D'Orbigny	Quenched	−0.16	0.06	0.02	−0.36	0.13	0.04	12
NWA1296	Quenched	−0.19	0.08	0.03	−0.42	0.13	0.04	10
NWA2999	Plutonic	−0.17	0.05	0.02	−0.34	0.12	0.04	10
NWA4590	Plutonic	−0.13	0.04	0.01	−0.31	0.09	0.03	10
NWA4931	Plutonic	−0.10	0.06	0.02	−0.23	0.13	0.04	10
Weighted mean		−0.14	0.06		−0.33	0.12		5

δ³⁰Si = [(³⁰Si/²⁸Si)_sample/(³⁰Si/²⁸Si)_standard − 1] × 1,000. All data are whole-rock analyses. 2 SD, 2 × SD; 2 SE, 2 × SD/√n, where n is number of measurements. NWA2999 and NWA4931 are paired specimens. Weights calculated as 1/sd².