GSCI 1050 Lecture Notes - Lecture 7: Igneous Rock, Viscosity, Volatiles
15 May 2017
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Quiz through huskyct begins at 10:25 - 30 minutes to complete it. Eruptions: eruptive behavior is controlled by the silica and water content of the magma. Volcanic products (3) lava: pyroclastic material (ash/chunks of rock/anything that"s ejected from the volcano, gases. Yellowstone"s past eruptions have produced vast ash deposits known as ignimbrite. Felsic: eruptions that tend to be violent in nature, which tends to link to fact that its magma had a very high viscosity. Hawaiian lavas usually have a relatively low viscosity. What type of magma is likely present at. Mafic: lava flows that travel long distances tend to be runny. Mafic: magma that can travel great distances. Felsic: magma that can be violent, can see ash and pyroclastic material. Volatiles: volatiles remain in place under pressure; as they rise, they begin to be released, but if the magma is really viscous, they get trapped and aren"t released until the pressure.
