Typically, most of the magmas hold 4-6% of water. Magmas containing 6-8% water are considered super-wet magmas, and the Department of Earth and Planetary Sciences, ETH Zürich suggests that such hydrous volcanoes can economically valuable mineral resources, especially Copper deposits. While the super-wet magmas are abundant at greater depths and not expected to persist at shallow depths, researchers think that are far more common than previously thought.
Volcanic activities can generate economically valuable mineral deposits
"Super-wet" magmas play a critical role in forming large deposits of copper
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