The oxidation state of deeply subducted, altered oceanic crust: an experimental study and the evidence from natural samples

Prokopiy Vasilyev
Eclogitic xenoliths from kimberlites are occasionally diamond-bearing, and are often interpreted as having an origin as subducted oceanic crust. The existence of diamonds in these rocks constrains equilibrium temperatures and pressures of some eclogites to the upper mantle. However the additional critical parameter controlling the stability of diamonds, oxygen fugacity (fO₂), is poorly constrained in eclogitic assemblages. A series of piston-cylinder experiments were conducted using model carbonate and kyanite bearing eclogite assemblages to determine the...
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