Table 3:

Average major and minor elements for plagioclase composition determined with EPMA

	MET 00452, 16		NWA 8649		QUE 97008, 12				Semarkona	NWA 8276
	c19	c111	c17	c87	c51	c61	c143	c150	c47	c7	c69	c87	c88
SiO2	45.46	46.90	44.73	44.87	45.86	46.13	46.55	45.72	44.88	45.59	45.32	44.84	44.28
TiO2	0.02	0.02	0.03	0.02	0.03	0.02	0.01	0.02	0.04	0.01	0.05	0.02	0.04
Al2O3	33.28	32.47	34.44	33.64	32.91	32.78	32.61	32.80	33.73	33.27	33.53	33.61	33.86
MgO	0.83	0.87	0.64	0.75	0.74	0.98	0.78	0.74	0.72	0.80	0.85	0.73	0.61
FeO	0.63	0.85	0.32	0.52	0.85	0.43	1.04	0.96	0.90	0.81	0.31	1.34	0.90
CaO	19.39	19.01	19.13	18.75	18.94	19.32	18.70	18.91	19.25	19.27	19.35	19.21	19.34
Na2O	0.23	0.24	0.73	0.77	0.42	0.17	0.40	0.36	0.05	0.15	0.14	0.29	0.05
K2O	0.00	0.00	0.00	0.00	0.00	−0.01	0.00	0.00	0.00	0.00	0.01	0.03	0.03
MnO	0.00	−0.01	0.01	0.00	0.01	0.01	0.00	−0.01	0.02	0.01	0.00	0.02	0.02
Total	99.84	100.37	100.04	99.33	99.76	99.84	100.12	99.51	99.60	99.93	99.55	100.08	99.13
Si	2.108	2.158	2.071	2.091	2.127	2.134	2.150	2.127	2.088	2.112	2.103	2.083	2.072
Al	1.818	1.761	1.879	1.848	1.799	1.787	1.775	1.799	1.849	1.816	1.834	1.840	1.868
Ca	0.963	0.938	0.949	0.936	0.941	0.958	0.925	0.942	0.959	0.957	0.962	0.956	0.970
Na	0.021	0.021	0.065	0.070	0.037	0.015	0.036	0.033	0.004	0.014	0.012	0.026	0.005
K	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.002	0.002
Mg	0.058	0.060	0.044	0.052	0.051	0.068	0.054	0.051	0.050	0.056	0.059	0.051	0.042
Fe	0.025	0.033	0.013	0.020	0.033	0.017	0.040	0.037	0.035	0.031	0.012	0.052	0.035
Mn	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.001	0.000	0.000	0.001	0.001
End-Member proportions
Ca(Fe,Mg,Mn)Si3O8	0.069	0.080	0.033	0.046	0.071	0.078	0.071	0.070	0.059	0.070	0.060	0.068	0.056
KAlSi3O8	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.001	0.001	0.002
NaAlSi3O8	0.016	0.021	0.049	0.056	0.036	0.014	0.032	0.029	0.002	0.013	0.011	0.018	0.004
CaAl2Si2O8	0.891	0.857	0.906	0.883	0.870	0.879	0.852	0.870	0.899	0.885	0.901	0.884	0.912
(Fe,Mg,Mn)Al2Si2O8	0.010	0.012	0.008	0.012	0.012	0.008	0.019	0.015	0.024	0.016	0.010	0.026	0.019
[ ]Si4O8	0.013	0.028	0.000	0.000	0.011	0.021	0.024	0.015	0.015	0.015	0.017	0.001	0.007
Ana	97.9	97.8	93.6	93.1	96.2	98.5	96.3	96.7	99.6	98.6	98.7	97.2	99.4

^aAn = Ca / (Ca + Na +K) mol%