ng rocR3. enough locally to enable minellis iul roduced erwis ing: Field and che

Question

ng rocR3. enough locally to enable minellis iul roduced erwis ing: Field and chemical evidence suggests that rocks did not crystallize from an intermediate magma bume and ma ediate magma butr fic magmas mixed. Exercise 9 covers these concepts. ed Explaining lgneous Features Found in the Field (e) In th fron EXERCISE 9 Section: Date: Name Course Use your knowledge of melting and magmatic processes to explain the origin of the following featu (a) Most continental rift zones contain basalt and rhyolite, but it is also possible to find small amou setting. Suggest an origin for the andesite 78

Explanation / Answer

Andesite is a type of lava intermediate between rhyolite, typically associated with explosive volcanism, and basalt, which flows like honey along the earth’s surface. Andesite is very common and forms volcanic cones or stratovolcanoes

Andesite are common rocks of the continental crust above subduction zones. They generally form after an oceanic plate melts during its descent into the subduction zone to produce a source of magma . Andesite is a fine-grained rock that formed when the magma erupted onto the surface and crystallized quickly

Andesite can also form away from the subduction zone environment. For example, it can form at ocean ridges and oceanic hot spots from partial melting of basaltic rocks

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