High temperature gas–solid reactions interactions are ubiquitous in and on the Earth and other planetary bodies (Fig. 1). In these natural systems, gases are elusive. Like a hurricane’s wind that leaves a path of destruction but no trace of wind after the event, the gas that initiated a gas–solid reaction may be conspicuously absent. Because gases effectively escape from geologic systems, gas–solid reactions may only be recorded by their stable, or metastable, solid reaction products.

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In this chapter, we seek to unravel the evidence and approaches that can be used to examine gas–solid reactions, especially through their solid...

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