Chondrites metal-silicate equilibria

Figure 5 Effect of pressure on the oCNi) and d(Co) for metal/silicate equilibrium. The larger effect on nickel causes a convergence of dS to values that are consistent with the near chondritic Ni/Co in the primitive upper mantle (sources (O) Ito et al, 1998 ( ) Li and Agee, 1996 (O) Thibault and Walter, 1995 ...

The most exotic materials in CP IDPs are particles of glass with embedded metal and sulfides, identified by the acronym GEMS (Fig. 12.8d). Although GEMS are commonly described as having chondritic bulk compositions, that description applies only for aggregates of these submicron particles. The nanometer-sized FeNi metal (kamacite) inclusions and pyrrhotite are clearly out of equilibrium with the magnesium-rich silicate... 

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