Table 2.

Nominal water content of starting materials calculated from their initial weight; water content of glassy starting materials was determined using FTIR analysis (see text and Fig. 2 for details); water content of melt pools after partitioning experiments was determined using SIMS; bulk water contents after partitioning experiments were calculated assuming that the water content in crystalline phases is negligible compared to the water content of melt pools (see "Halogen incorporation mechanism in olivine" for details): H₂O_{bulk − after experiment} = H₂O_{SIMS−melt pool} × (1-(crystal/melt)_total) with (crystal/melt)_total being the bulk sample crystal/melt ratio derived from Table 1. Uncertainties are given as 2σ

Sample	H2O (nominal; starting material; wt%)		H2O (FTIR; starting material; wt%)	H2O (SIMS; melt pool; wt%)	H2O (bulk – after experiment; wt%)
CMAS_dry	0	b.d		0.06 (2)	0.03 (2)
CMAS_05	0.05	0.23 (2)		0.33 (4)	0.26 (7)
CMAS_2	0.2	0.30 (3)		0.42 (4)	0.33 (6)