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Magma Viscosity, Volatile Content, Partial Melting, and Mixing - Igneous Petrology

GEO GIRL via YouTube

Overview

Explore the factors controlling volcanic eruption explosivity in this comprehensive geology video. Delve into the differences between felsic and mafic magmas, examining their silicate content, structure, and resulting crystallization processes. Investigate how volatiles like water and CO2 influence magma viscosity and eruption intensity. Learn about the relationship between magma viscosity, density, and volcanic explosivity. Discover the processes of partial melting, fractional crystallization, magma assimilation, and magmatic mixing. Gain insights into how these factors contribute to the formation of various igneous rocks and the diverse nature of volcanic eruptions on Earth's surface.

Syllabus

Felsic vs mafic magmas
How volatiles affect volcanic explosivity
How volatiles affect viscosity and vice versa
what happens when you blow bubbles in viscous materials?
What controls viscosity?
How magma density affects eruptions
Partial melting of magmas
Fractional crystallization of magmas
Magma assimilation & mixing
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Taught by

GEO GIRL

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