Journal of Geochemistry

Research Article

Electron Microscopic Studies of Ilmenite from the Chhatrapur Coast, Odisha, India, and Their Implications in Processing

Table 1

EPMA results (in wt.%) of various ilmenite grains from the Chhatrapur coast.


	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20

Al₂O₃	0.061	0.001	0.036	0.08	0.087	0.028	0	0.07	0.046	0.036	0.008	0.038	0.031	0.028	0.019	0.005	0.057	0.062	0.011	0.04
FeO	44.368	45.242	45.877	44.638	45.053	45.768	46.394	42.719	45.329	45.355	47.691	49.987	44.685	43.729	45.301	46.781	45.387	44.539	45.935	47.109
MgO	0.959	0.185	0.375	0.666	0.659	0.17	0.512	0.248	0.951	0.225	0.071	1.254	0.707	1.357	0.554	0.429	0.863	0.729	0.069	0.399
MnO	0.281	0.28	0.202	0.22	0.205	0.283	0.477	0.346	0.244	0.294	0.579	0.41	0.286	0.125	0.493	0.161	0.501	0.177	0.147	0.206
CaO	0	0	0	0.018	0	0.013	0	0.061	0.019	0.021	0.006	0.014	0.007	0	0.002	0.005	0	0	0.003	0.013
Na₂O	0	0.071	0	0	0	0	0.003	0.023	0.01	0.056	0	0.05	0	0.004	0.012	0.009	0.19	0.223	0.026	0.039
TiO₂	53.708	53.741	53.114	55.094	53.503	53.231	51.488	55.411	52.455	53.027	50.25	45.665	53.282	54.656	52.228	52.153	52.683	53.933	53.883	51.574
Cr₂O₃	0.041	0.018	0.043	0.016	0.023	0.048	0.033	0.025	0.025	0.08	0.028	0.054	0.019	0.015	0.053	0.036	0.089	0.017	0	0.048
NiO	0	0	0	0	0	0	0	0	0.003	0	0.028	0	0.023	0.034	0	0.013	0	0	0	0.051
ZnO	0.164	0	0.008	0	0	0.049	0.038	0.041	0.009	0	0.021	0	0.016	0.233	0	0.044	0	0	0.031	0
ZrO₂	0	0	0.012	0	0.012	0	0.016	0	0	0.036	0	0	0.009	0.011	0.035	0	0	0.01	0.011	0.028
HfO₂	0	0	0.015	0	0.003	0	0.034	0.033	0.026	0	0	0	0	0	0	0.021	0.029	0	0	0.02
V₂O₅	0.292	0.29	0.286	0.294	0.293	0.287	0.284	0.306	0.287	0.287	0.273	0.247	0.289	0.295	0.284	0.286	0.276	0.295	0.296	0.279
Total	99.874	99.828	99.968	101.03	99.838	99.877	99.279	99.283	99.404	99.417	98.955	97.719	99.354	100.49	98.981	99.943	100.08	99.985	100.41	99.806
Ti/Ti + Fe	0.483	0.478	0.472	0.488	0.478	0.473	0.461	0.500	0.472	0.474	0.448	0.413	0.479	0.491	0.471	0.462	0.472	0.483	0.475	0.458
Based on	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)	6(O)

Al	0.0036	0	0.0021	0.0046	0.0051	0.0016	0	0.0041	0.0027	0.0022	0.0005	0.0023	0.0018	0.0016	0.0012	0.0003	0.0034	0.0036	0.0006	0.0024
Fe	1.8524	1.8978	1.9269	1.8373	1.8862	1.9245	1.9752	1.7695	1.9123	1.9142	2.0545	2.2158	1.8799	1.8053	1.9236	1.9758	1.9035	1.8575	1.9188	1.9976
Mg	0.0714	0.0139	0.0281	0.0489	0.0492	0.0127	0.0389	0.0183	0.0715	0.0169	0.0054	0.099	0.053	0.0999	0.042	0.0323	0.0645	0.0054	0.0057	0.0301
Mn	0.0119	0.0119	0.0086	0.0092	0.0087	0.012	0.0206	0.0145	0.0104	0.0126	0.0253	0.0184	0.0122	0.0052	0.0212	0.0069	0.0213	0.0075	0.0062	0.0088
Ca	0	0	0	0.0009	0	0.0007	0	0.0032	0.001	0.0011	0.0003	0.0008	0.0004	0	0.0001	0.0003	0	0	0.0002	0.0007
Na	0	0.0069	0	0	0	0	0.0003	0.0022	0.001	0.0055	0	0.0052	0	0.0004	0.0012	0.0009	0.0185	0.0215	0.0025	0.0038
Ti	2.0165	2.0272	2.0061	2.0392	2.0143	2.0128	1.9713	2.0825	1.99	2.0125	1.9466	1.8203	2.0157	2.0291	1.9943	1.9808	1.9868	2.0227	2.024	1.9666
Cr	0.0016	0.0007	0.0017	0.0006	0.0009	0.0019	0.0013	0.001	0.001	0.0033	0.0011	0.0023	0.0008	0.0006	0.0021	0.0014	0.0035	0.0007	0	0.0019
Ni	0	0	0	0	0	0	0	0	0.0001	0	0.0012	0	0.0009	0.0013	0	0.0005	0	0	0	0.0021
Zn	0.006	0	0.0003	0	0	0.0018	0.0014	0.0015	0.0003	0	0.0008	0	0.0006	0.0085	0	0.0017	0	0	0.0011	0
Zr	0	0	0.0003	0	0.0003	0	0.0004	0	0	0.0009	0	0	0.0002	0.0003	0.0009	0	0	0.0002	0.0003	0.0007
Hf	0	0	0.0002	0	0	0	0.0005	0.0005	0.0004	0	0	0	0	0	0	0.0003	0.0004	0	0	0.0003
V	0.0117	0.0117	0.0115	0.0116	0.0118	0.0116	0.0116	0.0122	0.0116	0.0116	0.0113	0.0105	0.0116	0.0117	0.0116	0.0116	0.0111	0.0118	0.0118	0.0114
Total	3.9751	3.9701	3.9858	3.9523	3.9765	3.9796	4.0215	3.9095	4.0023	3.9808	4.047	4.1746	3.9771	3.9639	3.9982	4.0128	4.013	3.9309	3.9712	4.0264

End member composition
Pyrophanite	0.6148	0.6186	0.438	0.4854	0.4475	0.6156	1.0124	0.8045	0.5215	0.6482	1.2133	0.7886	0.6272	0.2722	1.067	0.3424	1.0707	0.401	0.3211	0.4321
Gaekelite	3.6886	0.7226	1.431	2.5799	2.5307	0.6515	1.9118	1.0154	3.5854	0.8695	0.259	4.2431	2.7248	5.2293	2.114	1.603	3.2423	0.2898	0.2952	1.478
Ilmenite	95.697	98.659	98.131	96.935	97.022	98.733	97.076	98.18	95.893	98.482	98.528	94.968	96.648	94.499	96.819	98.055	95.687	99.309	99.384	98.09