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

Applications and Investigations in Earth Science (9th Edition)
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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 arcs, and in some
volcanic island arcs. Today, we understand that most intermediate magmas are pro-
duced at subduction zones by the mixing of magma produced durinơ subduction
Transcribed Image Text: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 arcs, and in some volcanic island arcs. Today, we understand that most intermediate magmas are pro- duced at subduction zones by the mixing of magma produced durinơ subduction
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