Figure F4. A. SiO2/MgO ratio vs. loss on ignition (LOI) for serpentinite muds. For comparison we also included the ODP Legs 125 and 195 serpentinized peridotites. The serpentinized peridotite clasts and the serpentinite muds have similar LOI contents (average = ~15 wt%), but the SiO2/MgO ratio of the muds is higher. Also note that the serpentinized peridotites are usually with Si/Mg ~ 1. B. MgO vs. LOI for serpentinite muds. For comparison we also included the ODP Legs 125 and 195 serpentinized peridotites. Overall the serpentinite muds from Leg 195 (Guggino et al., 2002, and shipboard data) have higher MgO than the Leg 125 serpentinite muds, resembling the serpentinized peridotites. There is no relationship between the LOI and MgO in any of the data sets plotted. C. SiO2 vs. MgO for serpentinite muds. For comparison also shown are ODP Legs 125 and 195 serpentinized peridotites. The serpentinite muds have similar to the serpentinized peridotites SiO2 and lower MgO contents. In all of the samples analyzed, there is no correlation between the SiO2 and the MgO abundances. Symbols are the same as in A. Also, symbols in Figures F4

Figure F4. A. SiO₂/MgO ratio vs. loss on ignition (LOI) for serpentinite muds. For comparison we also included the ODP Legs 125 and 195 serpentinized peridotites. The serpentinized peridotite clasts and the serpentinite muds have similar LOI contents (average = ~15 wt%), but the SiO₂/MgO ratio of the muds is higher. Also note that the serpentinized peridotites are usually with Si/Mg ~ 1. B. MgO vs. LOI for serpentinite muds. For comparison we also included the ODP Legs 125 and 195 serpentinized peridotites. Overall the serpentinite muds from Leg 195 (Guggino et al., 2002, and shipboard data) have higher MgO than the Leg 125 serpentinite muds, resembling the serpentinized peridotites. There is no relationship between the LOI and MgO in any of the data sets plotted. C. SiO₂ vs. MgO for serpentinite muds. For comparison also shown are ODP Legs 125 and 195 serpentinized peridotites. The serpentinite muds have similar to the serpentinized peridotites SiO₂and lower MgO contents. In all of the samples analyzed, there is no correlation between the SiO₂and the MgO abundances. Symbols are the same as in A. Also, symbols in Figures F4–F7 are consistent.