chap05 - Chapter 5 Volcanism Geology 11 Principles of...

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Chapter 5 Volcanism Geology 11 – Principles of Geology A. M. P. Tengonciang National Institute of Geological Sciences University of the Philippines, Diliman
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5.0 Volcanism ± Encompasses all processes associated with the transfer of molten rock and gases from the interior of the Earth to its surface ± Volcano – an opening in the crust through which molten lava and gases erupt ± Eruption – when magma rises from its source or from a storage reservoir and reaches the Earth’s surface Why does magma rise? ± Physical properties (temperature, composition, viscosity, relative buoyancy) ± Input of fresh magma into magma reservoir ± Pushes magma upwards ± Can cause magma chamber to expand/break ± Degassing ± Magma becomes less dense ± The gas exerts pressure on overlying & surrounding rocks ± Squeezed out by overlying & surrounding rocks
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5.1 Volcanic eruptions ± Eruption styles ± Effusive – dominated by the outpouring of lava onto the ground ± Explosive – fragmentation of magma caused by ± Eruption mechanisms ± Decompression and exsolution of magmatic gas
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This note was uploaded on 11/20/2010 for the course LIR 30 taught by Professor Thornley,k during the Spring '08 term at Santa Rosa.

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chap05 - Chapter 5 Volcanism Geology 11 Principles of...

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