volcanism_july2011 - 7/4/2011 Volcanism Geology 11...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
7/4/2011 1 Volcanism Geology 11 Principles of Geology Department of Physical Sciences University of the Philippines, Baguio 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 Eruption styles Effusive dominated by the outpouring of lava onto the ground
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
7/4/2011 2 2006 effusive eruption, Mayon volcano, Albay Eruption styles Effusive dominated by the outpouring of lava onto the ground Explosive fragmentation of magma caused Eruption mechanisms Decompression and exsolution of magmatic gas Interaction of water with ascending magma explosive!!!
Background image of page 2
7/4/2011 3 Explosivity of eruptions is affected by Gas content Silica content Viscosity SiO 2 MAGMA TYPE TEMP. (centigrade)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/09/2011 for the course GEOL 11 taught by Professor Pellejera during the Summer '11 term at University of the Philippines Diliman.

Page1 / 9

volcanism_july2011 - 7/4/2011 Volcanism Geology 11...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online