Fe2+–Mg partitioning between olivine and liquid at low oxygen fugacity: an experimental and thermodynamic framework

Saper, L. M.; Baker, M. B.; Stolper, E. M.

doi:10.1007/s00410-022-01955-0

Table 2 Experimental run conditions and products

From: Fe²⁺–Mg partitioning between olivine and liquid at low oxygen fugacity: an experimental and thermodynamic framework

Name	Starting Mix	Run Type	Time (hr)	T °C	log₁₀fO₂	ΔIW	Re^a	Phases^b	∆FeO (%)^c	\({\mathrm{K}}_{\mathrm{D},{\mathrm{Fe}}^{*}-\mathrm{Mg}}^{\mathrm{ol}/\mathrm{liq}}\) ^d	1σ^e	\({\mathrm{K}}_{\mathrm{D},{\mathrm{Fe}}^{2+}-\mathrm{Mg}}^{\mathrm{ol}/\mathrm{liq}}\) ^f
Name	Starting Mix	Run Type	Time (hr)	T °C	log₁₀fO₂	ΔIW	Loop #	Phases^b	∆FeO (%)^c		1σ^e
RKD-1	synHP1 + Cr + Mn	S	6	1350	–9.7	+ 0.5	1	ol, gl, sp, Re	–1.29	0.3124	0.0089	0.3247
RKD-2	synHP1 + Cr + Mn	S	17	1350	–9.7	+ 0.5	2	ol, gl, sp, Re	–10.32	0.3133	0.0102	0.3257
RKD-3	synHP1 + Cr + Mn	S	17	1350	–9.7	+ 0.5	3	ol, gl, sp	–12.90	0.3133	0.0040	0.3253
RKD-4	synHP1 + Cr + Mn	S	42	1350	–9.7	+ 0.5	4	ol, gl, sp, (met)	–13.43	0.3108	0.0031	0.3225
RKD-5	synHP1 + Cr + Mn	E	19	1350	–9.7	+ 0.5	4	ol, gl, sp	–5.77	0.3154	0.0039	0.3273
RKD-6	synHP1 + Cr + Mn	E	17	1300	–10.2	+ 0.5	4	ol, gl, sp, (met)	–1.74	0.3152	0.0029	0.3262
RKD-7	synHP1 + Cr + Mn	E	17	1400	–9.2	+ 0.5	4	ol, gl, sp	–6.52	0.3158	0.0038	0.3286
RKD-8	HAB + Ol + Mn	S	17	1300	–10.2	+ 0.5	5	ol, gl	–1.24	0.3003	0.0034	0.3110
RKD-9	HAB + Ol + Mn	S	48	1300	–10.2	+ 0.5	5	ol, gl	–7.34	0.3031	0.0034	0.3134
RKD-12	HAB + Ol + Mn	E	24	1300	–10.2	+ 0.5	5	ol, gl	–4.06	0.3038	0.0047	0.3144
RKD-13	synMORB Mg80	S	20	1300	–10.2	+ 0.5	6	ol, gl, (met)	–3.94	0.3174	0.0030	0.3275
RKD-14	synMORB Mg80	E	24	1300	–10.2	+ 0.5	6	ol, gl, (met)	–4.37	0.3149	0.0034	0.3249
RKD-15	synMORB Mg80	E	23	1225	–11.1	+ 0.5	6	ol, gl, px, pl, (met)	–1.76	0.3155	0.0044	0.3247
RKD-16	synMORB Mg60	S	24	1225	–11.1	+ 0.5	7	ol, gl, (met)	–3.70	0.3249	0.0036	0.3352
RKD-17	synMORB Mg60	E	24	1225	–11.1	+ 0.5	7	ol, gl, (met)	–2.96	0.3247	0.0035	0.3350
RKD-19	HAB + Ol + Mn	S	48	1225	–11.1	+ 0.5	5	ol, gl, pl	–5.60	0.3042	0.0069	0.3140
RKD-20	HAB + Ol + Mn	E	48	1225	–11.1	+ 0.5	5	ol, gl, pl	–6.45	0.3073	0.0049	0.3172
RKD-21	synMORB Mg60	E	48	1175	–11.7	+ 0.5	7	ol, gl, px, pl, (met)	–1.19	0.3284	0.0049	0.3394
RKD-22	synMORB Mg40	S	48	1175	–11.7	+ 0.5	6	ol, gl, pl, (met)	1.42	0.3489	0.0035	0.3617
RKD-23	synMORB Mg40	S	25	1175	–11.7	+ 0.5	9	ol, gl, pl, (met)	–0.88	0.3354	0.0057	0.3477
RKD-24	synMORB Mg40	E	48	1175	–11.7	+ 0.5	9	ol, gl, pl, (met)	–0.50	0.3387	0.0034	0.3511
RKD-25	synHP1	E	48	1350	–9.7	+ 0.5	4	ol, gl	–8.31	0.3146	0.0036	0.3262
RKD-26	synHP1 + Cr + Mn	E	48	1300	–10.2	+ 0.5	4	ol, gl, sp	–5.59	0.3157	0.0026	0.3266
RKD-28	synMORB Mg80	S	24	1300	–11.2	–0.5	10	ol, gl, (met)	–5.47	0.3180	0.0035	0.3242
RKD-29	synMORB Mg80	S	22	1300	–11.2	–0.5	10	ol, gl, (met)	–5.96	0.3136	0.0033	0.3197
RKD-30	synMORB Mg80	E	24	1300	–11.2	–0.5	10	ol, gl, (met)	–5.41	0.3174	0.0032	0.3237
RKD-31	synMORB Mg40	S	24	1175	–12.7	–0.5	11	ol, gl, pl, (met)	–0.64	0.3358	0.0069	0.3433
RKD-32	synMORB Mg40	S	24	1175	–12.7	–0.5	11	ol, gl, pl, (met)	–0.96	0.3344	0.0046	0.3418
RKD-33	synMORB Mg40	S	48	1175	–12.7	–0.5	12	ol, gl, pl, (met)	–1.60	0.3459	0.0034	0.3536
RKD-34	synMORB Mg40	S	24	1175	–12.7	–0.5	12	ol, gl, pl, (met)	–0.61	0.3270	0.0041	0.3344
RKD-35	synMORB Mg40	E	48	1175	–12.7	–0.5	12	ol, gl, pl, (met)	–1.25	0.3500	0.0040	0.3578

Compositions of the starting mixes are listed in Table 1. ∆IW refers to the ƒO₂ of the experiments expressed in log units relative to the iron–wüstite buffer reaction calculated at the experimental T and 1 atm (Huebner 1971). Saturation experiments (S) were those used to precondition wire loops; equilibration experiments (E) were run using the pre-saturated loops. a Re loop number used in each experiment. b Phase abbreviations: ol – olivine, gl – glass, sp – spinel, px – pyroxene, pl – plagioclase, Re – Re metal globules, which were only observed in RKD-1 and RKD-2 due to initial oxidation of the metal (see Supplementary Section S2), and (met) – Fe–Pt metal blebs, which were observed as trace contaminants (labeled in parentheses) in 19 experiments, but maybe present in all of the runs; see Fe–Pt metal blebs and Supplementary Section S1.4. c ∆FeO* is the percent change in bulk FeO* calculated by mass balance (see Approach to equilibrium and Supplementary Section S3. d \({\mathrm{K}}_{\mathrm{D},{\mathrm{Fe}}^{*}-\mathrm{Mg}}^{\mathrm{ol}/\mathrm{liq}}\) = (FeO/MgO)^ol / (FeO*/MgO)^liq and is calculated using the averages of olivine and glass analyses in each experiment (Table 3). e 1σ calculated by summing the errors in FeO* and MgO in each phase in quadrature. f \({\mathrm{K}}_{\mathrm{D},{\mathrm{Fe}}^{2+}-\mathrm{Mg}}^{\mathrm{ol}/\mathrm{liq}}\), where Fe³⁺/Fe²⁺ in the glass is calculated using the expression of Borisov et al. (2018)

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