EXERCISE 5.10 Origin of Mafic Magmas in Different Plate-Tectonic Settings Name: Section: Course: Date: Explain which type of melting (flux, decompression, heat transfer) is responsible for mafic magmas in each of the following plate-tectonic settings and why the resulting magma is mafic. (a) Mid-ocean ridges (b) Continental rifts (c) Volcanic island and continental arcs (d) Hot spots 5.5.3 Plate-Tectonic Settings of Intermediate Igneous Rocks (Andesite and Diorite) In the mid-twentieth century, geologists were puzzled by the fact that nearly all andesites occur next to ocean trenches, in continental volcanic ares, and in some volcanic island ares. Today, we understand that most intermediate magmas are prO-

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