What Is Magma?

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6. Decompression Melting

This is one of the mechanisms by which rocks melt to form basaltic magma. It occurs when the rock is kept at a sustained level of high temperature with the pressure reduced. The temperature just has to be close to the rock’s melting point. The reduction in pressure, or decompression, is due to being moved closer to the surface by convention movement in Earths mantle.

At this point, the rock can turn semi-liquid, resulting in partial melting. It is believed that decompression melting is what creates the ocean crust beneath oceanic ridges, and continental rift valleys on the continents of Africa and Europe.

Magma

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