Ehlers et al. (1992) proposed the possibility that, at normal magmatic temperatures and low oxygen fugacities (~IW), a significant proportion of Ni in the silicate liquid existed in the zero-valent state, i.e. metallic Ni. Subsequently, Colson (1992) performed Ni solubility experiments in very reducing systems and reached a similar conclusion.

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There must be an explanation for the Ehlers experiments; I do not believe these were bad experiments. Therefore, more experiments and analyses on this composition might be interesting.

The issue of zero-valent Ni has been doubled-down on with respect to Pt. Despite being a co-author on a paper advocating metal...

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