Table 1.

U isotopic compositions of angrite samples and terrestrial standards

Sample	238U/235U	Measurement uncertainty 2SD	Spike uncertainty 2SD	Total uncertainty 2SD	N	238U intensity (V)	Age adjustment (Ma)
D’Orbigny pyroxenes*†	137.778	0.028	0.020	0.034	1	6.5	-1.06 ± 0.36
Bulk D’Orbigny-1†	137.790	0.010	0.020	0.025	3	18	-0.94 ± 0.26
Bulk D’Orbigny-2‡	137.791	0.010	0.021	0.026	3	12	-0.92 ± 0.27
ADOR phosphates*	137.806	0.033	0.020	0.039	1	2.5	-0.77 ± 0.40
Bulk NWA 4801‡	137.778	0.009	0.021	0.026	3	11	-1.07 ± 0.27
Bulk NWA 4590‡	137.772	0.004	0.021	0.026	3	17	-1.13 ± 0.27
Bulk NWA 6291‡	137.769	0.006	0.021	0.026	3	15	-1.17 ± 0.27
Leach NWA 6291‡	137.800	0.007	0.021	0.026	3	11	-0.83 ± 0.27
Residue NWA 6291‡	137.759	0.015	0.021	0.026	1	11	-1.26 ± 0.27
Terrestrial Std. BCR-2†	137.800	0.026	0.020	0.033	3	4
Terrestrial Std. G-2†	137.809	0.006	0.020	0.026	4	16
SRM950a†‡	137.837	0.015	0.021	0.026	28	2.5–20

The age adjustment is calculated based on the measured U isotope composition in comparison to the previously assumed consensus value for the ²³⁸U/²³⁵U ratio of 137.88.

N = number of repeat runs.

^*Using 10¹² Ω resistors on ²³³U, ²³⁵U, and ²³⁶U; 10¹¹ Ω resistors were used for measuring these isotopes in all other samples.

^†Using in-house ASU double-spike.

^‡Using IRMM-3636 double-spike.