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

Choudhary, Shubham; Sen, Koushik; Rana, Shruti; Kumar, Santosh

doi:10.1186/s40645-022-00531-1

Progress in Earth and Planetary Science

Table 2 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	51.32	50.98	50.67	51.07	50.82	51.16	50.3	49.85	48.46	48.29	49.84	50.33	48.61	49.71	47.29
TiO₂	0.79	1.11	1.01	0.91	0.85	0.8	0.61	1.2	1.59	1.73	0.65	0.62	1.09	0.83	1.92
Al₂O₃	1.87	2.24	2.15	1.96	2.24	1.42	1.8	3.08	4.03	4.56	1.77	1.72	2.63	2.24	4.88
FeO	9.17	9.27	9.65	9.87	9.37	9.45	13.9	7.96	7.74	6.78	14.26	12.48	14.37	12.64	6.92
MnO	0.17	0.22	0.16	0.22	0.33	0.39	0.68	0.15	0.13	0.19	0.48	0.58	0.68	0.42	0.15
MgO	12.52	11.77	11.74	11.78	11.34	12.54	8.78	12.58	11.99	12.42	8.64	9.7	8.26	9.11	11.85
CaO	22.82	23.07	22.89	22.67	22.58	23.05	21.09	23.76	23.99	24.28	20.68	21.71	20.86	21.31	24.13
Na₂O	1.07	1.28	1.19	1.2	1.26	0.47	1.84	0.85	0.83	0.7	1.82	1.64	1.88	1.81	0.74
K₂O	0.00	0.01	0.00	0.00	0.00	0.02	0.02	0.02	0.03	0.03	0.04	0.02	0.00	0.00	0.02
Total	99.73	99.95	99.46	99.68	98.79	99.30	99.02	99.45	98.79	98.98	98.18	98.80	98.38	98.07	98.00
On the basis of 6O
Si	1.916	1.903	1.903	1.915	1.922	1.931	1.928	1.863	1.825	1.810	1.929	1.923	1.880	1.915	1.795
Ti	0.022	0.031	0.029	0.026	0.024	0.023	0.018	0.034	0.045	0.049	0.019	0.018	0.032	0.024	0.055
Al	0.082	0.099	0.095	0.087	0.100	0.063	0.081	0.136	0.179	0.201	0.081	0.077	0.120	0.102	0.218
Fe3	0.118	0.126	0.128	0.120	0.100	0.066	0.165	0.134	0.143	0.133	0.163	0.163	0.198	0.155	0.137
Fe2	0.168	0.163	0.175	0.190	0.196	0.233	0.280	0.115	0.101	0.079	0.299	0.236	0.267	0.252	0.082
Mn	0.005	0.007	0.005	0.007	0.011	0.012	0.022	0.005	0.004	0.006	0.016	0.019	0.022	0.014	0.005
Mg	0.697	0.655	0.657	0.658	0.639	0.705	0.502	0.701	0.673	0.694	0.498	0.553	0.476	0.523	0.671
Ca	0.913	0.923	0.921	0.911	0.915	0.932	0.866	0.951	0.968	0.975	0.857	0.889	0.864	0.880	0.981
Na	0.077	0.093	0.087	0.087	0.092	0.034	0.137	0.062	0.061	0.051	0.137	0.122	0.141	0.135	0.054
K	0	0.000	0.000	0.000	0.000	0.001	0.001	0.001	0.001	0.001	0.002	0.001	0.000	0.000	0.001
Sum	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00	4.00
Mg#	80.57	80.04	78.99	77.61	76.49	75.19	66.16	85.94	86.99	89.77	62.50	70.08	64.08	67.47	89.07

The table shows the composition of Cpx (Diopside and Aegirine-Augite) based on EPMA point analysis

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