Phreatomagmatic eruption

Ashfall deposit of phreatomagmatic origin, overlying lapilli fall deposit of magmatic origin

Phreatomagmatic eruptions are volcanic eruptions resulting from interaction between magma and water. They differ from exclusively magmatic eruptions and phreatic eruptions. Unlike phreatic eruptions, the products of phreatomagmatic eruptions contain juvenile (magmatic) clasts.[1] It is common for a large explosive eruption to have magmatic and phreatomagmatic components.

  1. ^ Heiken, G. & Wohletz, K. 1985. Volcanic Ash. University of California Press, Berkeley

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