Chapter 17: Continental Arcs - Faculty web pages

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Chapter 17: Continental Arc Magmatism Figure 17-15b. Major plutons of the South American Cordillera, a principal segment of a continuous Mesozoic-Tertiary belt from the Aleutians to Antarctica. After USGS.
Petrogenesis of continental arc magmas • Complex, multi-source, multi-stage • Origin – peridotites of mantle wedge • Melting induced by addition of LIL-enriched fluids from subducting slab • Primary magma = olivine tholeiite basalt • Pond at base of thick cont crust and undergo fractional xstallization, assimilation, and melting of lower crustal rocks Figure 17-23. Winter (2001) An Introduction to Igneous and Metamorphic Petrology.
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Chapter 17: Continental Arcs - Faculty web pages

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