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What does fugacity mean in the context of geology?

'Fugacity' is effectively the equivalent of chemical activity, but for gases. Fugacity relates to the partial pressure of a particular volatile component of a system in the same way that chemical ...
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What is the difference between a depleted mantle, and a fertile or enriched mantle?

Basically, a fertile mantle is a portion of mantle that has not experienced any melting. On the other hand, a depleted mantle has experienced partial melting, and subsequent extraction of this melt. ...
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