The responses of the four main substitution mechanisms of H in olivine to H2O activity at 1050 °C and 3 GPa

Progress in Earth and Planetary Science

Table 2 Calculated water concentrations in each of the three principal crystallographic orientations using polarised FTIR data and also total water calculated from unpolarised FTIR data using the method of Kovacs et al. (2008)

		E\|\|a			E\|\|b			E\|\|c			Total
Experiment	X_H2O	H₂O (ppm)	sd	n	H₂O (ppm)	sd	n	H₂O (ppm)	sd	n	H₂O (ppm)	sd	Unpolarised H₂O (ppm)	n
[Si] integration range 3650–3420 cm⁻¹
21	0.379	67	23	11	39	24	7	44	7	6	150	33	163	19
20	0.438	164	51	11	55	21	5	49	30	14	268	55	307	22
32	0.63	418	30	12	241	31	12	139	36	12	798	43	676	21
31	0.717	472	40	17	281	28	14	218	22	11	970	49	918	35
22	0.814	609	101	15	381	147	10	248	81	16	1239	178	1147	26
30	0.892	719	124	13	430	88	15	287	75	13	1436	152	1302	34
23	1	1208	104	10	661	138	8	444	43	7	2314	173	2087	14
[Mg] integration range 3268–3107 cm⁻¹
84	0.56							16	4	11	16	4
85	1							24	3	15	24	3
[triv] integration range 3375–3293 cm⁻¹
40	1	79	5	3	40	5	6	48	3	7	167	7
41	1	58	6	6	30	2	3	11	2	3	100	6
75	1	34	5	6	21	6	3	20	2	7	75	8
36	1	102	4	7	44	4	12	53	6	10	199	6	193	24
82	0.82	91	3	8	46	3	4	50	2	3	187	4	178	21
81	0.68	80	2	6	40	5	4	44	3	6	164	5	152	22
83	0.5	67	4	10	30	2	6	37	5	7	133	5	136	23
91	0.36	58	4	10	24	3	7	29	3	8	111	5	101	20
89	0.24	42	2	5	15	6	1	22	6	4	79	6	76	10
[Ti] integration range 3586–3495 cm⁻¹
62	1	84	11	3	15	5	6	38	2	8	138	12	140	21
34	1	91	16	12	13	9	7	35	5	7	139	18	146	31
37	1	50	8	6	10	9	6	26	8	9	86	12	81	20
79	1	31	4	5	7	4	4	15	4	6	54	6	57	14
42	1	88	8	13	14	7	8	39	5	7	140	11	142	23
76	0.81	81	4	5	12	4	7	37	2	7	130	6	128	31
69	0.7	73	7	4	12	3	10	29	4	5	115	8	103	22
70	0.57	57	5	11	9	1	4	20	4	5	86	5	94	21
77	0.41	40	4	5	5	2	5	15	1	3	60	4	61	23
80	0.22	25	4	13	5	2	10	10	3	10	40	4	36	22

Only the principal absorption bands that dominate in each experiment were used, as indicated by the integration ranges. The data from the [triv] experiments have had the contribution from [Si] subtracted, as explained in the text. The expected standard deviation of the unpolarised data is ~10%, as discussed in Kovacs et al. (2008)
sd standard deviation in ppm