Lecture 4 Notes

Lecture 4 Notes - If the pyroclasts are still very hot when...

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If the pyroclasts are still very hot when they are deposited after an eruption, they may weld together. The result is a very strong rock called a tuff . Tuff : a hard igneous rock that is made up of welded pyroclasts.
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A tuff under a microscope
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Tuff near Jackpot, Nevada
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Tuff near Jackpot, Nevada
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Mount St. Helens is part of the Cascade Mountains in Washington and Oregon Ocean-continent convergent boundary (subduction zone) The Juan de Fuca Plate is subducting beneath the North American Plate in this region. Review
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Volcanism doesn’t only happen at volcanoes Volcanism : The process by which magma rises through the crust and emerges at the surface as lava Volcano : A hill or mountain constructed by an accumulation of lava and pyroclasts. Volcanism is the more inclusive term that includes but is not limited to the formation of volcanoes. Review
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Where does volcanism occur? 1. Divergent boundaries [ This is where most volcanism occurs ] 2. Subduction zones (convergent boundaries) [ This is where most volcanoes are ] 3. Intraplate volcanism (hotspots) [ This is where some volcanism occurs ] Review
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Volcanic arc Volcanic arc Summary of where volcanism occurs
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Lecture 4 Notes - If the pyroclasts are still very hot when...

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