Geology Theme 1

yellowstone magma type

basalt

yellowstone geologic setting

columbia plateau

1st stage of continental hotspot

massive basalt

2nd stage of continental hotspot

rhyolite volcano chain

3rd stage of continental hotspot

stem flow basalt

rhyolite silica level

high

space between volcanic arc and accretionary mountain range

forearc basin

original volcano of crater lake

mt mazama

crater lake volcano type

composite/strato volcano

crater lake silica content

intermediate

crater lake rock type

andesite

crater lake slope

steep

shield volcano rock type

low silica, basalt

cinder cone volcano

small, thin basalt, stacks cinder

composit/strato volcano

andesite/rhyolite, layers of lava and ash, steep

lava dome

small, round, thick

mauna loa silica content

mafic/low

mauna loa rock type

basalt

mauna loa volcano type

shield

mauna loa slope

gentle

yellowstone silica content

felsic/high

yellowstone rock type

rhyolite and granite

yellowstone volcano type

supervolcano

rhyolite silica content

felsic

rhyolite int/extrusive

extrusive

rhyolite look

light color, fine grain

basalt silica content

mafic

basalt int/extrusive

extrusive

basalt look

dark color, fine grain

granite silica content

felsic

granite int/extrusive

intrusive

granite look

red, coarse grain

gabbro silica content

mafic

gabbro int/extrusive

intrusive

gabbro look

dark, coarse grain

first national park

yellowstone

felsic silica color

light

mafic silica color

dark

volatile fluid

explosive gas in magma