The role of the antigorite + brucite to olivine reaction in subducted serpentinites (Zermatt, Switzerland)

Swiss Journal of Geosciences

Table 7 Fluid production from the antigorite + brucite reaction, calculated vs measured

Ol-in calculated at 2 GPa, Bc-out at 2.5 GPa
Sources of bulk rock compositions: Zermatt bulk; for phase diagram computation from Li et al. (2004a, 2004b): Lhz = average bulk rock # 16–19 (meta-lherzolites), Hzb = average bulk rock #1–8 & 10–14 (meta-harzburgites), Dun = bulk rock sample lg 15 (meta-dunites)
EPMA bulk from the quantitative map (Fig. 10)
Primitive mantle (PM) from McDonough and Rudnick (1999) (Table 1)
IODP Hzb = average abyssal meta-harzburgites (n = 48), Dun = average abyssal meta-dunites (n = 20): From Deschamps et al. (2013) (Table 1)
1. LOI’s [wt% H₂O] from Li et al. (2004a, 2004b). 2. As soon as talc is present brucite is absent
* All iron as FeO = FeO_tot
** Bulk − FeO_tot
¹Calculated at Ol-in [wt% H₂O]
²Calculated at Bc-out [wt% H₂O]
³Natural olivines at Bc-out Measured with EPMA
⁴Density change in kg/m³ and in mass%