Progress in Earth and Planetary Science

Table 3 Quantitative mineral chemistry data

From: Petrogenetic history and melt inclusion characteristics of mantle plume-derived ijolites from NE India: implications for multistage crystallization and occurrence of “nano-calciocarbonatites”

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
Spot analysis
SiO₂	29.73	29.60	29.80	30.15	29.96	30.06	30.11	29.89	29.51	30.02	29.94	29.58	29.92	30.08	29.77
TiO₂	38.14	37.72	36.92	36.71	37.11	36.87	37.29	36.70	37.11	37.13	36.46	37.26	36.15	37.19	37.20
Al₂O₃	0.50	0.53	0.78	0.72	0.51	0.55	0.54	0.71	0.50	0.57	1.07	0.67	0.66	0.59	0.70
FeO	1.22	1.36	1.44	1.51	1.25	1.04	1.18	1.33	1.20	1.11	1.45	1.13	1.60	1.20	1.38
MnO	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
MgO	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
CaO	26.88	27.55	27.83	27.46	27.76	27.89	27.25	27.63	27.52	27.14	26.93	27.23	27.31	27.85	27.50
La₂O₃	0.02	0.07	0.00	0.06	0.17	0.16	0.11	0.23	0.14	0.04	0.06	0.09	0.14	0.00	0.05
Nb₂O₅	0.76	0.73	0.56	0.62	0.56	0.74	0.98	1.07	0.94	0.63	0.64	0.67	0.44	0.54	0.66
Total	97.25	97.56	97.32	97.22	97.31	97.32	97.47	97.56	97.00	96.60	96.50	96.63	96.22	97.45	97.25
On the basis of 5O
Si	1	1	1	1	1.01	1.02	1.02	1.01	1	1.02	1.02	1	1.02	1.01	1.01
Ti	0.97	0.96	0.94	0.93	0.94	0.94	0.95	0.93	0.95	0.95	0.93	0.95	0.93	0.94	0.94
Al	0.01	0.02	0.03	0.02	0.02	0.02	0.02	0.02	0.02	0.02	0.04	0.02	0.02	0.02	0.02
Fe2	0.03	0.03	0.04	0.04	0.03	0.02	0.03	0.03	0.03	0.03	0.04	0.03	0.04	0.03	0.03
Mn	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Mg	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Ca	0.97	1	1.01	0.99	1	1.01	0.98	1	1	0.98	0.98	0.99	1	1	0.99
Sum	3.00	3.00	3.00	3.00	3.00	3.00	3.00	3.00	3.00	3.00	3.00	3.00	3.00	3.00	3.00

The table shows the composition of titanite based on EPMA point analysis

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