Table 2.

Isotopic results for Mg-suite samples. Sr isotopic composition fractionation corrected to ⁸⁶Sr/⁸⁸Sr=0.1194. The average value for ⁸⁷Sr/⁸⁶Sr obtained for NIST-987 Sr=0.7102561±0.0000013 (n=5), but the data in the table are reported relative to a value of 0.71025. Nd is fractionation corrected to ¹⁴⁶Nd/¹⁴⁴Nd=0.7219, with ¹⁴³Nd/¹⁴⁴Nd reported relative to a value of 0.512115 for the JNdi Nd standard. Hf is fractionation corrected to ¹⁷⁹Hf/¹⁷⁷Hf=0.7325 and reported relative to a value of ¹⁷⁶Hf/¹⁷⁷Hf=0.282160 in the JMC-475 Hf standard. All fractionation correction is done assuming exponential mass dependency. ¹⁴²Nd/¹⁴⁴Nd and ¹⁷⁶Hf/¹⁷⁷Hf are corrected for neutron capture as explained in the text. The LLNL Hf isotopic data were measured on an unspiked aliquot.

	77215 WR	77215-WR (LLNL)	77215 Plag	77215 Px	78238 WR	76355 WR	67667 WR
weight (g)	0.0685	0.1200	0.0159	0.0128	0.0911	0.1372	0.0742
[Rb] ppm	2.67		6.59	1.09	1.40	0.998	0.587
[Sr] ppm	92.6		216	7.80	83.8	157	117
87Rb/86Rb	0.0834		0.0884	0.4041	0.0483	0.0183	0.0145
87Sr/86Sr	0.704124		0.704723	0.724811	0.702287	0.700235	0.700043
2σ	0.000004		0.000003	0.000010	0.000004	0.000004	0.000004
[Sm] ppm	3.520		8.350	2.224	2.425	1.104	2.812
[Nd] ppm	12.13		47.78	6.082	8.386	3.689	8.805
147Sm/144Nd	0.1754		0.1566	0.2210	0.1748	0.1810	0.1930
143Nd/144Nd	0.512016		0.511491	0.513320	0.511988	0.512171	0.512538
2σ	0.000004		0.000004	0.000005	0.000001	0.000002	0.000004
142Nd/144Nd	1.141812		1.141806	1.141831	1.141816	1.141817	1.141829
2σ	0.000008		0.000007	0.000010	0.000003	0.000004	0.000008
[Lu] ppm	0.642	0.671	0.444	0.897	0.370	0.115	0.395
[Hf] ppm	2.700	3.483	3.501	3.988	1.687	1.258	2.112
176Lu/177Hf	0.03375	0.02734	0.01801	0.03193	0.0311	0.0130	0.0266
176Hf/177Hf	0.282778	0.282240	0.281421	0.282601	0.282554	0.281029	0.282187
2σ	0.000006	0.000010	0.000006	0.000009	0.000003	0.000005	0.000004