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7 Cards in this Set
- Front
- Back
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Intraplate volcanism
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Igneous activity that occurs within a tectonic plate away from plate boundaries.
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How is plate tectonics and volcanism related?
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Plate motion provide the mechanisms by which mantle rocks melt to generate magma.
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What results at a convergent oceanic-oceanic plate?
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The formation of a chain of volcanoes on the ocean floor. Eventually they will grow large enough to rise above the surface. Once they hit the surface they are called volcanic island arcs.
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What results at a convergent oceanic-continental plate?
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Produces a continental volcanic arc
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What is the major difference between volcanic island arcs and continental volcanic arc?
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Continental crust is much thicker and is composed of rocks with a higher silica content than oceanic crust.
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When and where is most magma produced?
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Along ocean ridges during seafloor spreading
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Where does most intraplate volcanism occur?
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Where a mass of hotter than normal mantle material called a mantle plume rises towards the surface.
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