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AU - GEO 1100 - Class Notes - Week 11

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Schools > Auburn University > Geography > GEO 1100 > AU - GEO 1100 - Class Notes - Week 11

AU - GEO 1100 - Class Notes - Week 11

School: Auburn University
Department: Geography
Course: Intro Geology
Professor: Hawkins
Term: Fall 2016
Tags: Geology, geology notes, volcanoes, and Hawkins
Name: Geology notes on Volcanoes week 10-11
Description: These notes include information on volcanoes stressed in class, in the textbook and in the purple notebook. These notes include the types of eruptions, volcanoes and much more. The bold topics consist of important things to know.
Uploaded: 10/26/2016
0 5 3 2 Reviews
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background image Volcanoes 
 
The United States  •  The most visited sites  o  Yellowstone national park 
o  Mount St. Helens 
§   Last eruption of the U.S.  ú   May 18, 1980  Types of eruptions (change viscosity)  •  Quite  o  Non explosive, generally mafic lava  §   Example: Hawaii volcanoes National park  •  Explosive  o  Deadly, intermediate and felsic lava, high viscosity  §   Mount St. Helens  •  How to determine what kind of  eruption it is?  o  The amount of silica found in the molten material that  the volcano is erupting  §   High silica content (more felsic in nature) this  makes the material very viscus and allows it to 
trap a large quantity of dissolved gasses 
ú   This dissolved gas causes pressure to build  up resulting in a volcanic eruption  §   Low viscosity (more mafic in nature) the dissolves  gasses are allowed to escape through the volcanic 
vent therefore pressure does not build up 
ú   No pressure means no explosion  Terms to know for location of molten lava  •  Lava: molten rock erupted onto the Earth’s surface 
•  Magma: molten material still within the Earth’s Surface 
•  Both lava and magma are present in the plumbing of all 
volcanic systems  o  Magma becomes lava 
o  If lava flows back underground then it can become 
magma again  Lava types (both between 1000-1200 degrees and move at variable 
rates-fats or slow) 
•  Aa  o  If you were to walk over this you’d probably say  “AHHH-AHH”  o  Variety of solidified lava is generally crumbly with sharp  jagged edges  o  Angular and jagged 
background image §   Blocky when rolling down hill  o  Will be crumbly on the top and bottom with molten  material in the center  o  Rate or movement it flows depends on the slope  gradient and pressure following the flow  §   Most common flow speed is rapid but can varey  •  Pahoehoe  o  Will stand in stark 
o  Very smooth and tends to fold like fine fabric 
§   Ropey texture, flow slow and smooth  o  Most common flow speed is slow and silky  The three categories for volcanoes  •  Broad brushed concepts 
•  No volcano is typical and its behavior can deviate from 
“typical characteristics” at any given moment  •  Three types  o  Shield   §   Largest type of volcano  ú   Largest mountains in the world  •  From ocean floor to the top of volcano  §   Very shallow slopes (2˚ at base, 10˚ at top)  §   Basaltic lavas- dark, black  ú   Primary mafic  ú   Low viscosity  §   Almost exclusively lava  ú   Feed by magma that is rising deep from the  mantle  ú   Material ejected from the central cone is  primary flowing lava of both aa and 
pahoehoe 
ú   Can stretch for miles  §   Once the magma center has moved from the hot  spot, the volcano will no longer be supplied with  eruptible material  §   Example: Hawaii  ú   Mauna Kea and Mauna Lou  o  Composite  §   Large volcano (typically 8,000 feet high)  ú   Height begins at Earth’s surface and not sea  level  §   Classic volcano shape, concave upward slopes  (15˚ at base, 30˚ at top)  ú   Steep sides  §   Mostly intermediate compositions 

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School: Auburn University
Department: Geography
Course: Intro Geology
Professor: Hawkins
Term: Fall 2016
Tags: Geology, geology notes, volcanoes, and Hawkins
Name: Geology notes on Volcanoes week 10-11
Description: These notes include information on volcanoes stressed in class, in the textbook and in the purple notebook. These notes include the types of eruptions, volcanoes and much more. The bold topics consist of important things to know.
Uploaded: 10/26/2016
4 Pages 49 Views 39 Unlocks
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  • Notes, Study Guides, Flashcards + More!
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