John Seach, Volcano Live

 Decompression Melting - John Seach

The process of decompression melting involves the upward movement of the earth's mantle to an area of lower pressure. The reduction in overlying pressure enables the rock to melt, leading to magma formation.

Magma is formed by the melting of the earth's mantle. Three processes are involved.

      • An increase in temperature. (least important)
      • Decompression melting
      • Addition of impurities.

Contrary to popular belief magma in not primarily formed because the mantle heats up but because of decompression melting and a lowering of the solidus temperature by the addition of impurities to the system.

Decompression Melting
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