Some information on geology: Difference between revisions
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There are three types of lavas formed by volcanoes. Mafic, Intermediate, and Felsic.<br> | There are three(3) types of lavas formed by volcanoes. Mafic, Intermediate, and Felsic.<br> | ||
<B><U>Mafic</B><U>(Basaltic)</U><br> | |||
<li>%SiO2: < 50%</li> | |||
<li>%FeMg: 4%</li> | |||
<li>Temp: up to 1500C</li> | |||
<li>Viscosity: Low</li> | |||
<li>Eruptive Behavior: gentle</li> | |||
<li>Distribution: divergent plate boundries, hot spots, convergent plate boundries</li> | |||
<B><U>Intermediate</B><U>(Andesitic)</U><br> | |||
<li>%SiO2: ~60%</li> | |||
<li>%FeMg: ~3%</li> | |||
<li>Temp: ~1000C</li> | |||
<li>Viscosity: Intermediate</li> | |||
<li>Eruptive Behavior: explosive</li> | |||
<li>Distribution: convergent plate boundries</li> | |||
<B><U>Felsic</B>(Rhyolitic)<U></U><br> | |||
<li>%SiO2: >70%</li> | |||
<li>%FeMg: 2%</li> | |||
<li>Temp: 700C</li> | |||
<li>Viscosity: High</li> | |||
<li>Eruptive Behavior: explosive</li> | |||
<li>Distribution: hot spots in continental crusts (Yellowstone National Park)</li> | |||
%SiO2: >70%< | |||
%FeMg: 2%< | |||
Temp: 700C< | |||
Viscosity: High< | |||
Eruptive Behavior: explosive< | |||
Distribution: hot spots in continental crusts (Yellowstone National Park) | |||
Revision as of 20:49, 6 October 2004
There are three(3) types of lavas formed by volcanoes. Mafic, Intermediate, and Felsic.
Mafic(Basaltic)
Intermediate(Andesitic)
Felsic(Rhyolitic)