The message of oldhamites from enstatite chondrites

Progress in Earth and Planetary Science

Table 4 Mass balance and EH3 reconstruction (1.1% oldhamite; 1% niningerite; 60% enstatite)

ppm	Sahara 97158	Oldh	Enst	Nining.^c	Budget	Missing^d	Missing
Fraction^a	WR^b	0.011	0.60	0.01			%^e
La	0.227	9.31	0.177	0.075	0.21	0.017	7.6
Ce	0.571	17.05	0.520	0.087	0.50	0.070	12.3
Pr	0.088	1.88	0.065	0.021	0.06	0.028	32.1
Nd	0.434	7.75	0.301	0.070	0.27	0.168	38.6
Sm	0.136	2.69	0.086	0.049	0.08	0.054	40.0
Eu	0.054	3.48	0.020	0.022	0.05	0.003	5.9
Gd	0.189	1.98	0.136	0.016	0.10	0.086	45.3
Tb	0.034	0.33	0.025	0.001	0.02	0.016	45.8
Dy	0.238	2.21	0.167	0.026	0.12	0.113	47.5
Ho	0.054	0.46	0.036	0.012	0.03	0.027	50.2
Er	0.159	1.37	0.103	0.046	0.08	0.081	51.2
Tm	0.024^f	0.22	0.018	0.012^f	0.01	0.011	44.5
Yb	0.154	6.81	0.080	0.340	0.13	0.028	18.1
Lu	0.025	0.21	0.021	0.020	0.02	0.010	38.8

CI-norm	Sahara 97158	Oldh	Enst	Nining	Budget	Missing^d
La	0.964	39.62	0.753	0.320	0.89	7.317
Ce	0.951	28.42	0.866	0.145	0.83	11.728
Pr	0.966	20.61	0.711	0.235	0.66	31.031
Nd	0.936	16.70	0.649	0.152	0.57	36.129
Sm	0.889	17.56	0.561	0.323	0.53	35.595
Eu	0.915	59.32	0.342	0.377	0.86	5.359
Gd	0.918	9.61	0.660	0.077	0.50	41.578
Tb	0.914	8.74	0.665	0.039	0.50	41.833
Dy	0.937	8.69	0.658	0.103	0.49	44.524
Ho	0.946	8.08	0.634	0.209	0.47	47.432
Er	0.956	8.23	0.622	0.276	0.47	48.933
Tm	0.932^f	8.33	0.701	0.457^f	0.52	41.508
Yb	0.917	40.54	0.475	2.022	0.75	16.557
Lu	1.013	8.39	0.866	0.817	0.62	39.315

^aMineral fractions were adapted from Gannoun et al. (2011)
^bWR is the average of whole rock analysis given by Gannoun et al. (2011) and Barrat et al. (2014)
^cNiningerite data from Gannoun et al. (2011)
^dThe missing component was estimated by subtracting the contributions of the phases from the whole rock (WR) REE content
^e% represents the REE in the missing component relative to the WR composition
^fTm in WR was not measured in Barrat et al. (2014), and Tm in niningerite was not analyzed by Gannoun et al. (2011). For mass balance purposes, Tm was interpolated using reported Er and Lu values