Unformatted text preview: nsen (2001) 10 Landforms - central vent eruptions
b) Composite Volcano
Illustrative cross section of a stratovolcano
image source: Winter (2010) Image source: J.D. Griggs, January 10, 1985 image source: Hamblin and Christiansen (2001) Mt. Rainier Composite
rhyolites). intermediate to high silica 11 Landforms - central vent eruptions
c) Cinder Cone or scoria cone Video clip:
-en.html loose collection of airborne ash, lapilli, and blocks
falling around central vent, generally at angle of Cinder cones in summit
basin of Haleakala, HI
/Maui.htm repose. Undergo rapid erosion
Cross sectional structure and morphology of small
explosive volcanic landforms with approximate scales.
image source: Winter (2010) 12 4 8/27/2012 Landforms - central vent eruptions d) spatter cone - clots of magma ejected from central vent: ﬂuid, degrassing note symmetry, size of central vent, angles of repose Spatter cone in Galapagos Islands.
Spatter commonly sticks together, or agglutinates, when it lands
and is buried by later spatter. result of magma interaction with water image source: Barb Dutrow, LSU
image source: Winter (2010) 13 Landforms - central vent eruptions c) maar - Low cone resulting from explosive
interaction of magma with groundwater. Large central Left: Maar is ~300 m in diameter. Eruption column generated by phreatic and
magmatic explosions rises from larger east maar. vent Below: Aerial view toward N of Ukinrek Maars, Alaska. Water partially fills
eastern maar and completely covers lava dome that was erupted in 100-m deep
crater during 10-day eruption in 1977.
image source: http://volcanoes.usgs.gov/Products/Pglossary/maar.html 14 Landforms - central vent eruptions c) tuff cone or tuff ring - cone of pyroclastic material
that dips inwards and outward at roughly the same a
that dips inward and outward at roughly same angle Below: Tuff cone di
Nisida (Campi Flegrei,
Italy) Above: Tuff rings (Saudi
Arabia) Tuff ring - Diamond Head, Hawaii
image source: Winter (2010) Image source:
gy/vulcanismo/tuff-conesrings.htm 15 5 8/27/2012...
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