what type of plate boundary is associated with felsic magma?
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Mafic (basaltic) and ultramafic magmas form along the divergent midoceanic ridges and are major components of new oceanic crust. More felsic magmas, such as andesites and rhyolites, are associated with the edges of continental crust at subduction zones along converging plate boundaries.
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Convergent plate boundaries. Igneous rocks associated with convergent plate boundaries have the greatest diversity. In this case, granite batholiths underlie the great composite volcanoes and consist of rocks ranging from basalt through andesite to dacite and rhyolite.
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Convergent boundaries form strong earthquakes, as well as volcanic mountains or islands, when the sinking oceanic plate melts. The third type is transform boundaries, or boundaries where plates slide past each other, forming strong earthquakes.
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TECTONIC PLATES. Mt St Helens is on the plate boundary between Juan de Fuca and the North American plates, the boundary is also a part of the Ring of Fire. The Juan de Fuca plate is an oceanic plate and the North American plate is a continental plate.
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Convergent Plate Boundaries. Sections of the Ring of Fire , subduction zones that surround much of the Pacific Ocean, are underwater. Submarine volcanoes at these convergent plate boundaries are much like their counterparts on land. Many of these volcanoes form new islands that last only a short time.
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The Washington-Oregon coastline of the United States is an example of this type of convergent plate boundary. Here the Juan de Fuca oceanic plate is subducting beneath the westward-moving North American continental plate. The Cascade Mountain Range is a line of volcanoes above the melting oceanic plate.
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Volcanoes and earthquakes are most likely to form along plate boundaries.
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Felsic rocks are high in silica (65% +). They are usually light-colored. Some examples are: Rhyolite (extrusive) and granite (intrusive). Intermediate rocks have lower silica content (55-65%).
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The movement of molten rock in the mantle causes convection currents which makes the plates move. The study of these plates is called plate tectonics. Most earthquakes and volcanoes eruptions take place at plate boundaries. The crust is solid and is the layer we live on.
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Oceanic lithosphere consists mainly of mafic crust and ultramafic mantle (peridotite) and is denser than continental lithosphere, for which the mantle is associated with crust made of felsic rocks. Oceanic lithosphere thickens as it ages and moves away from the mid-ocean ridge.
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There are places on the earth where the movement of the plate causes them to collide. These collisions cause convergent boundaries. The collisions of large masses of the crust result in mountains ( such as the Himilayans ) , earthquakes ( such as the San Andreas fault) .
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Recall that there are three types of plate boundaries: convergent, divergent, and transform. Volcanism occurs at convergent boundaries (subduction zones) and at divergent boundaries (mid-ocean ridges, continental rifts), but not commonly at transform boundaries.
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['Convergent boundaries: where two plates are colliding. Subduction zones occur when one or both of the tectonic plates are composed of oceanic crust. ... ', 'Divergent boundaries – where two plates are moving apart. ... ', 'Transform boundaries – where plates slide passed each other.']
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The deep trenches, volcanic activity, and mountain ranges are formed along convergent plate boundaries and depend on the type of crustal plate involved in the collision. The collision between oceanic crust and continental crust result in the subduction of dense oceanic crust under the less dense continental crust...
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Volcanoes are most common in these geologically active boundaries. The two types of plate boundaries that are most likely to produce volcanic activity are divergent plate boundaries and convergent plate boundaries. At a divergent boundary, tectonic plates move apart from one another.
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Mountain building is most directly associated with convergent plate boundaries. 15. A volcanic island arc occurs where two oceanic plates converge and one is subducted beneath the other. The interaction of these two plates results in partial melting of the mantle wedge located above the subducting plate.
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Deep ocean trenches, volcanoes, island arcs, submarine mountain ranges, and fault lines are examples of features that can form along plate tectonic boundaries. Volcanoes are one kind of feature that forms along convergent plate boundaries, where two tectonic plates collide and one moves beneath the other.